UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

Commission file number 1-13831

Quanta Services, Inc.

(Exact name of registrant as specified in its charter)

1360 Post Oak Boulevard, Suite 2100

Houston, Texas 77056

(Address of principal executive offices, including ZIP Code)

(713) 629-7600

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act:

Title of Each Class

None

      Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days:     Yes þ          No o

      Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of Registrant’s knowledge, in definitive proxy or information statement incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.     o

      Indicate by check mark whether the Registrant is an accelerated filer (as defined in Exchange Act Rule 12b-2).     Yes þ          No o

      As of June 30, 2004, the aggregate market value of the Common Stock and Limited Vote Common Stock of the Registrant held by non-affiliates of the Registrant, based on the last sale price of the Common Stock on such date, was approximately $372.8 million and $4.5 million, respectively (for purposes of calculating these amounts, only directors, officers and beneficial owners of 5% or more of the outstanding capital stock of the Registrant have been deemed affiliates).

      As of March 10, 2005, the number of outstanding shares of the Common Stock of the Registrant was 116,086,371. As of the same date, 1,011,780 shares of Limited Vote Common Stock were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

      Portions of the Registrant’s Definitive Proxy Statement for the 2005 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K.

QUANTA SERVICES, INC.

ANNUAL REPORT ON FORM 10-K

For the Year Ended December 31, 2004

INDEX

PART I

General

      Quanta is a leading provider of specialty contracting services, offering end-to-end network solutions to the electric power, gas, telecommunications, cable television, and specialty services industries. We believe that we are the largest contractor serving the transmission and distribution sector of the North American electric utility industry. Our consolidated revenues for the year ended December 31, 2004 were $1.6 billion, of which 64.7% was attributable to electric power and gas customers, 16.8% to telecommunications and cable television system operators and 18.5% to ancillary services, such as inside electrical wiring, intelligent traffic networks, cable and control systems for light rail lines, airports and highways, and specialty rock trenching, directional boring and road milling for industrial and commercial customers. We were organized in the state of Delaware in 1997 and since that time have made strategic acquisitions to expand our geographic presence, generate operating synergies with existing businesses and develop new capabilities to meet our customers’ evolving needs.

      We have established a nationwide presence with a workforce of over 10,000 employees, which enables us to quickly and reliably serve our diversified customer base. Our customers include many of the leading companies in the industries we serve.

      Representative customers include:

      Our reputation for responsiveness, performance, geographic reach and a comprehensive service offering has also enabled us to develop strong strategic alliances with numerous customers.

Industry Overview

      We estimate that the total amount of annual outsourced infrastructure spending in the three primary industries we serve is in excess of $30 billion. We believe that we are the largest specialty contractor providing services for the installation and maintenance of network infrastructure and that we and the other five largest specialty contractors providing these services account for less than 15% of this market. Smaller, typically private companies provide the balance of these services.

      We believe the following industry trends impact demand for our services:

      Increased opportunities in Fiber to the Premises, or FTTP, and Fiber to the Node, or FTTN. We believe that several of the large telecommunications companies are increasing their spending, particularly for FTTP and FTTN initiatives. Initiatives for this last-mile fiber build-out have been announced by Verizon and SBC as well as municipalities throughout the United States. In late 2004, Verizon added six states to its deployment plan, with a stated goal to access two million homes during 2005. SBC has announced plans to deliver Internet telephone service to 18 million homes by the end of 2007, including the installation of more than 38,000 miles of fiber at an estimated cost of $4 billion. This fiber will deliver integrated IP-based television, high-speed Internet and IP voice and wireless bundles of products and services. As a result of these efforts, we expect an increase in demand for our telecommunications and underground construction services over the next few years. While not all of this spending will be for services that we provide, we believe that we are well positioned to furnish infrastructure solutions on a rapid basis for these initiatives.

      Increased capital expenditures resulting from improved customer balance sheets. During the last several years, the industries we serve suffered a severe downturn that resulted in a number of companies, including several of our customers, filing for bankruptcy protection or experiencing financial difficulties. We believe that as our customers continue to improve their balance sheets, both capital spending and maintenance budgets will stabilize and move toward historical levels.

      Increased outsourcing of network infrastructure installation and maintenance. Financial and economic pressures on electric power, gas, telecommunications and cable television providers have caused an increased focus by providers on core competencies and, accordingly, an increase in the outsourcing of network services. Total employment in the electric utility industry declined dramatically in the last decade, reflecting, in part, the outsourcing trend by utilities. We believe that by outsourcing network services to third-party service providers, our customers can reduce costs, provide flexibility in budgets and improve service and performance. As a specialty contractor with nationwide scope, we are able to leverage our existing labor force and equipment infrastructure across multiple customers and projects, resulting in better utilization of labor and assets.

      Increasing need to upgrade electric power transmission and distribution networks. The nation’s electrical power grid is aging and requires significant maintenance and expansion to handle the country’s current and growing power needs. While the demand for electricity has grown, transmission capacity has decreased over the last ten years. The awareness of the need to upgrade the nation’s electrical power grid was heightened by the largest blackout in North America’s history on August 14, 2003. Additionally, as the selling of electricity increases across regional networks, capacity and reliability will become more important. We believe the current spending level is insufficient to adequately address future infrastructure maintenance requirements.

      Increased demand for comprehensive end-to-end solutions. We believe that electric power, gas, telecommunications and cable television companies will continue to seek service providers who can design, install and maintain their networks on a quick and reliable, yet cost effective basis. Accordingly, they are partnering with proven full-service network providers, like us, with broad geographic reach, financial capability and technical expertise.

Strengths

      Geographic reach and significant size and scale. As a result of our nationwide operations and significant scale, we are able to deploy services to customers across the United States. This capability is particularly important to our customers who operate networks that span multiple states or regions. The scale of our operations also allows us to mobilize significant numbers of employees on short notice for emergency service restoration. For example, after the damage from Hurricane Frances in August 2004, we quickly deployed approximately 1,300 workers to Florida to restore affected power lines.

      Strong financial profile. Our strong liquidity position provides us with the flexibility to capitalize on new business and growth opportunities. As of December 31, 2004, we had $265.6 million in cash and cash equivalents on our balance sheet and no significant debt obligations maturing before 2007.

      Strong and diverse customer relationships. We have established a solid base of long-standing customer relationships by providing high quality service in a cost-efficient and timely manner. We enjoy multi-year relationships with many of our customers. In some cases, these relationships are decades old. We derive a significant portion of our revenues from strategic alliances or long-term maintenance agreements with our customers, which we believe offer opportunities for future growth. For example, certain of our strategic alliances contain an exclusivity clause or a right of first refusal for a certain type of work or in a certain geographic region.

      Proprietary technology. Our electric power customers benefit from our ability to perform services without interrupting power service to their customers, which we refer to as energized services. Our proprietary LineMaster^tm robotic arm technology enhances our ability to deliver these energized services to our customers. We own the U.S. rights and the exclusive right to use the LineMaster^tm robotic arm for more than the next 10 years. We believe that delivery of energized services is a significant factor in differentiating us from

our competition and winning new business. Our energized services workforce is specially trained to deliver these services and operate the LineMaster^tm robotic arm.

      Delivery of comprehensive end-to-end solutions. We are one of the few network service providers capable of regularly delivering end-to-end solutions on a nationwide basis. As companies in the electric power, gas, telecommunications and cable television industries continue to search for service providers who can effectively design, install and maintain their networks, we believe that our service, industry and geographical breadth place us in a strong position to meet these needs.

      Experienced management team. Our senior management team has an average of 28 years of experience within the contracting industry, and our operating unit executives average over 25 years of experience in their respective industries.

Strategy

      The key elements of our business strategy are:

      Focus on expanding operating efficiencies. We intend to continue to:

      Focus on organic growth and leveraging existing customer relationships. We believe we can improve our rate of organic growth by expanding the breadth of products and solutions for our existing and potential customer base. We believe the combination of promoting best practices and cross-selling products to our customers positions us well for an improving end-market environment.

      Expand portfolio of services to meet customers’ evolving needs. We continue to offer an expanding portfolio of services that allows us to develop, build and maintain networks on both a regional and national scale and adapt to our customers’ changing needs. We intend to expand further our geographic and technological capabilities through both internal development and innovation and through selective acquisitions.

      Pursue new business opportunities. We continuously evaluate and pursue new business opportunities. Our subsidiary, Quanta Government Solutions (QGS), leverages our core expertise in pursuing additional opportunities in the government arena. QGS was formed to respond, as prime contractor, to requests for proposals from the U.S. government for power and communications infrastructure projects in the United States and overseas.

Services

      We design, install and maintain networks for the electric power, gas, telecommunications and cable television industries as well as commercial, industrial and governmental entities. The following provides an overview of the types of services we provide:

      Electric power and gas network services. We provide a variety of end-to-end services to the electric power and gas industries, including:

      Telecommunications and cable television network services. Our telecommunications and cable television network services include:

      Ancillary services. We provide a variety of comprehensive ancillary services to commercial, industrial and governmental entities, including:

Financial Information About Geographic Areas

      During the years ended December 31, 2002, 2003 and 2004, we operated primarily in the United States. We derived $8.5 million, $15.1 million and $22.8 million of our revenues from foreign operations during the years ended December 31, 2002, 2003 and 2004, respectively. As of December 31, 2002, 2003 and 2004, we held property and equipment in the amount of $1.0 million, $1.9 million and $3.1 million, respectively, in foreign countries.

      Our business, financial condition and results of operations in foreign countries may be adversely impacted by monetary and fiscal policies, currency fluctuations, energy shortages and other political, social and economic development.

Customers, Strategic Alliances and Preferred Provider Relationships

      Our customers include electric power, gas, telecommunications and cable television companies, as well as commercial, industrial and governmental entities. Our 10 largest customers accounted for 29.5% of our consolidated revenues in 2004. Our largest customer accounted for approximately 6.1% of our consolidated revenues for the year ended 2004.

      Although we have a centralized marketing strategy, management at each of our operating units is responsible for developing and maintaining successful long-term relationships with customers. Our management is incented to cross-sell services of other operating units to their customers. In addition, our business development group promotes and markets our services for prospective large national accounts and projects that would require services from multiple operating units.

      Many of our customers and prospective customers have qualification procedures for approved bidders or vendors based upon the satisfaction of particular performance and safety standards set by the customer. These customers typically maintain a list of vendors meeting these standards and award contracts for individual jobs only to those vendors. We strive to maintain our status as a preferred or qualified vendor to these customers.

      We believe that our strategic relationships with large providers of electric power and telecommunications services will offer opportunities for future growth. Many of these strategic relationships take the form of a strategic alliance or long-term maintenance agreement. Strategic alliance agreements generally state an intention to work together and many provide us with preferential bidding procedures. Strategic alliances and long-term maintenance agreements are typically agreements for an initial term of approximately two to four years that may include an option to add a one to two year extension at the end of the initial term. Certain of our strategic alliance and long-term maintenance agreements are “evergreen” contracts with exclusivity clauses providing that we will be awarded all contracts, or a right of first refusal, for a certain type of work or in a certain geographic region. None of these contracts, however, guarantees a specific dollar amount of work to be performed by us.

Backlog

      Backlog represents the amount of revenue that we expect to realize from work to be performed over the next twelve months on uncompleted contracts, including new contractual agreements on which work has not begun. Our backlog at December 31, 2003 and 2004 was approximately $1.01 billion and $1.07 billion. In many instances, our customers are not contractually committed to specific volumes of services under our long-term maintenance contracts and many of our contracts may be terminated with notice. There can be no assurance as to our customer’s requirements or that our estimates are accurate.

Competition

      The markets in which we operate are highly competitive. We compete with other independent contractors in most of the geographic markets in which we operate, and several of our competitors are large domestic

companies that may have greater financial, technical and marketing resources than we do. In addition, there are relatively few barriers to entry into some of the industries in which we operate and, as a result, any organization that has adequate financial resources and access to technical expertise may become a competitor. A significant portion of our revenues is currently derived from unit price or fixed price agreements, and price is often an important factor in the award of such agreements. Accordingly, we could be underbid by our competitors in an effort by them to procure such business. We believe that as demand for our services increases, customers will increasingly consider other factors in choosing a service provider, including technical expertise and experience, financial and operational resources, nationwide presence, industry reputation and dependability, which we expect to benefit contractors such as us. There can be no assurance, however, that our competitors will not develop the expertise, experience and resources to provide services that are superior in both price and quality to our services, or that we will be able to maintain or enhance our competitive position. We may also face competition from the in-house service organizations of our existing or prospective customers, including electric power, gas, telecommunications and cable television companies, which employ personnel who perform some of the same types of services as those provided by us. Although a significant portion of these services is currently outsourced by our customers, there can be no assurance that our existing or prospective customers will continue to outsource services in the future.

Employees

      As of December 31, 2004, we had 1,412 salaried employees, including executive officers, project managers or engineers, job superintendents, staff and clerical personnel and 9,408 hourly employees, the number of which fluctuates depending upon the number and size of the projects we undertake at any particular time. Approximately 46% of our employees at December 31, 2004 were covered by collective bargaining agreements, primarily with the International Brotherhood of Electrical Workers (IBEW). Under our agreements with our unions, we agree to pay specified wages to our union employees, observe certain workplace rules and make employee benefit payments to multi-employer pension plans and employee benefit trusts rather than administering the funds on behalf of these employees. These collective bargaining agreements have varying terms and expiration dates. The majority of the collective bargaining agreements contain provisions that prohibit work stoppages or strikes, even during specified negotiation periods relating to agreement renewal, and provide for binding arbitration dispute resolution in the event of prolonged disagreement.

      We provide a health, welfare and benefit plan for employees who are not covered by collective bargaining agreements. We have a 401(k) plan pursuant to which eligible employees who are not provided retirement benefits through a collective bargaining agreement may make contributions through a payroll deduction. We make matching cash contributions of 100% of each employee’s contribution up to 3% of that employee’s salary and 50% of each employee’s contribution between 3% and 6% of such employee’s salary, up to the maximum amount permitted by law. We also have an employee stock purchase plan that provides that eligible employees may contribute up to 10% of their cash compensation, not to exceed $21,250 annually, toward the semi-annual purchase of our common stock at a discounted price. Over 700 of our employees participated in the employee stock purchase plan during the year ended December 31, 2004.

      Our industry is experiencing a shortage of journeyman linemen in certain geographic areas. In response to the shortage, we seek to take advantage of various IBEW and National Electrical Contractors Association (NECA) referral programs and hire graduates from the joint IBEW/ NECA apprenticeship program which trains qualified electrical workers.

      We believe our relationships with our employees and union representatives are good.

Materials

      Our customers typically supply most or all of the materials required for each job. However, for some of our contracts, we may procure all or part of the materials required. We purchase such materials from a variety of sources and do not anticipate experiencing any difficulties in procuring such materials.

Training, Quality Assurance and Safety

      Performance of our services requires the use of equipment and exposure to conditions that can be dangerous. Although we are committed to a policy of operating safely and prudently, we have been and will continue to be subject to claims by employees, customers and third parties for property damage and personal injuries resulting from performance of our services. Our policies require that employees complete the prescribed training and service program of the operating unit for which they work in addition to those required, if applicable, by the IBEW and NECA prior to performing more sophisticated and technical jobs. For example, all journeyman linemen are required by the IBEW and NECA to complete a minimum of 7,000 hours of on-the-job training, approximately 200 hours of classroom education and extensive testing and certification. Each operating unit requires additional training, depending upon the sophistication and technical requirements of each particular job. We have established company-wide training and educational programs, as well as comprehensive safety policies and regulations, by sharing “best practices” throughout our operations.

Regulation

      Our operations are subject to various federal, state and local laws and regulations including:

      We believe that we have all the licenses required to conduct our operations and that we are in substantial compliance with applicable regulatory requirements. Our failure to comply with applicable regulations could result in substantial fines or revocation of our operating licenses.

Environmental Matters

      We are committed to the protection of the environment and train our employees to perform their duties accordingly. We are subject to numerous federal, state and local environmental laws and regulations governing our operations, including the handling, transportation and disposal of non-hazardous and hazardous substances and wastes, as well as emissions and discharges into the environment, including discharges to air, surface water and groundwater and soil. We also are subject to laws and regulations that impose liability and cleanup responsibility for releases of hazardous substances into the environment. Under certain of these laws and regulations, such liabilities can be imposed for cleanup of previously owned or operated properties, or properties to which hazardous substances or wastes were sent by current or former operations at our facilities, regardless of whether we directly caused the contamination or violated any law at the time of discharge or disposal. The presence of contamination from such substances or wastes could interfere with ongoing operations or adversely affect our ability to sell, lease, or use our properties as collateral for financing. In addition, we could be held liable for significant penalties and damages under environmental laws and could also be subject to a revocation of licenses or permits, which could materially and adversely affect our business and results of operations.

      From time to time, we may incur costs and obligations for correcting environmental noncompliance matters and for remediation at or relating to certain of our properties. We believe we have complied with, or are currently complying with, our environmental obligations to date and that such liabilities will not have a material adverse effect on our business or financial performance.

Risk Management and Insurance

      The primary risks in our operations are bodily injury and property damage. We are insured for employer’s liability and general liability claims, subject to a deductible of $1,000,000 per occurrence and for auto liability

and workers’ compensation claims subject to a deductible of $2,000,000 per occurrence. We also have a corporate non-union employee related health care benefit plan that is subject to a deductible of $250,000 per claimant per year. Losses up to the deductible amounts are accrued based upon our estimates of the ultimate liability for claims incurred and an estimate of claims incurred but not reported. The accruals are based upon known facts and historical trends and management believes such accruals to be adequate. However, insurance liabilities are difficult to assess and estimate due to the many relevant factors, the effects of which are often unknown, including the severity of an injury, the determination of our liability in proportion to other parties, the number of incidents not yet reported and the effectiveness of our safety program. In an effort to mitigate our exposure, we implemented a new company-wide safety initiative in 2004 to enhance our existing safety program.

      Our casualty insurance carrier for the policy periods from August 1, 2000 to February 28, 2003 is experiencing financial distress, but is currently paying valid claims. In the event that this insurer’s financial situation further deteriorates, we may be required to pay certain obligations that otherwise would have been paid by this insurer. We estimate that the total future claim amount that this insurer is currently obligated to pay on our behalf for the above-mentioned policy periods is approximately $4.0 million; however, our estimate of the potential range of these future claim amounts is between $2.0 million and $9.0 million. The actual amounts ultimately paid by us related to these claims, if any, may vary materially from the above range and could be impacted by further claims development and the extent to which the insurer could not honor its obligations. We continue to monitor the financial situation of this insurer and analyze any alternative actions that could be pursued. In any event, we do not expect any failure by this insurer to honor its obligations to us, or any alternative actions we may pursue, to have a material adverse impact on our financial condition; however, the impact could be material to our results of operations or cash flow in a given period.

Website Access

      Our website address is www.quantaservices.com. You may obtain free electronic copies of our Annual Reports on Form 10-K, Quarterly Reports on Form  10-Q, Current Reports on Form 8-K, and any amendments to these reports in our Investor Center under the heading “SEC Filings.” These reports are available on our website as soon as reasonably practicable after we electronically file them with, or furnish them to, the SEC. In addition, our corporate governance guidelines, Code of Ethics and Business Conduct and the charters of our Audit Committee, Compensation Committee and Governance and Nominating Committee are posted on our website under the heading “Corporate Governance.” We intend to disclose on our website any amendments or waivers to our Code of Ethics and Business Conduct that are required to be disclosed pursuant to Item 5.05 of Form 8-K. You may obtain free copies of these items from our website or by contacting our Corporate Secretary.

Annual CEO Certification

      As required by New York Stock Exchange rules, on June 11, 2004 we submitted an annual certification signed by our Chief Executive Officer certifying that he was not aware of any violation by us of New York Stock Exchange corporate governance listing standards as of the date of the certification.

Risk Factors

      Our business is subject to a variety of risks, including the risks described below. The risks and uncertainties described below are not the only ones facing our company. Additional risks and uncertainties not known to us or not described below may also impair our business operations. If any of the following risks actually occur, our business, financial condition and results of operations could be harmed and we may not be able to achieve our goals. This Annual Report also includes statements reflecting assumptions, expectations, projections, intentions, or beliefs about future events that are intended as “forward-looking statements” under the Private Securities Litigation Reform Act of 1995 and should be read in conjunction with the section entitled “Uncertainty of Forward-Looking Statements and Information.”

      Our operating results may vary significantly from quarter to quarter. We experience lower gross and operating margins during winter months due to lower demand for our services and more difficult operating conditions. Additionally, our quarterly results may also be materially and adversely affected by:

      Accordingly, our operating results in any particular quarter may not be indicative of the results that you can expect for any other quarter or for the entire year.

      An economic downturn may lead to less demand for our services. If the general level of economic activity remains slow or deteriorates further, our customers may delay or cancel new projects. The telecommunications and utility markets experienced substantial change during 2002 and 2003 as evidenced by an increased number of bankruptcies in the telecommunications market, continued devaluation of many of our customers’ debt and equity securities and pricing pressures resulting from challenges faced by major industry participants. These factors have contributed to the delay and cancellation of projects and reduction of capital spending that have impacted our operations and ability to grow at historical levels. A number of other factors, including financing conditions for and potential bankruptcies in the industries we serve, could adversely affect our customers and their ability or willingness to fund capital expenditures in the future or pay for past services. In addition, consolidation, competition or capital constraints in the electric power, gas, telecommunications or cable television industries may result in reduced spending by, or the loss of, one or more of our customers.

      Our industry is highly competitive. Our industry is served by numerous small, owner-operated private companies, a few public companies and several large regional companies. In addition, relatively few barriers prevent entry into some of our industries. As a result, any organization that has adequate financial resources and access to technical expertise may become one of our competitors. Competition in the industry depends on a number of factors, including price. Certain of our competitors may have lower overhead cost structures and may, therefore, be able to provide their services at lower rates than we are able to provide. In addition, some of our competitors have greater resources than we do. We cannot be certain that our competitors will not develop the expertise, experience and resources to provide services that are superior in both price and quality to our services. Similarly, we cannot be certain that we will be able to maintain or enhance our competitive position within our industry or maintain a customer base at current levels. We may also face competition from the in-house service organizations of our existing or prospective customers. Electric power, gas, telecommunications and cable television service providers usually employ personnel who perform some of the same types of services we do. We cannot be certain that our existing or prospective customers will continue to outsource services in the future.

      We extend credit to customers for purchases of our services, and in the past we have had, and in the future we may have, difficulty collecting receivables from major customers that have filed bankruptcy or are otherwise experiencing financial difficulties. We grant credit, generally without collateral, to our customers, which include electric power and gas companies, telecommunications and cable television system operators, governmental entities, general contractors, and builders, owners and managers of commercial and industrial properties located primarily in the United States. Consequently, we are subject to potential credit risk related to changes in business and economic factors throughout the United States. Our customers in the telecommunications business have experienced significant financial difficulties and in several instances have filed for bankruptcy. A number of our utility customers are also experiencing business challenges in the current business climate. If additional major customers file for bankruptcy or continue to experience financial difficulties, or if anticipated recoveries relating to receivables in existing bankruptcies or other workout situations fail to materialize, we could experience reduced cash flows and losses in excess of current allowances provided. In addition, material changes in any of our customer’s revenues or cash flows could affect our ability to collect amounts due from them. As of December 31, 2004, total current and non-current accounts and notes receivable were $368.7 million, net of allowances for doubtful accounts of $52.6 million.

      Our casualty insurance carrier for prior periods is experiencing financial distress, which may require us to make payments for losses that would otherwise be insured. Our casualty insurance carrier for the policy periods from August 1, 2000 to February 28, 2003 is experiencing financial distress, but is currently paying valid claims. In the event that this insurer’s financial situation deteriorates, we may be required to pay certain obligations that otherwise would have been paid by this insurer. We estimate that the total future claim amount that this insurer is currently obligated to pay on our behalf for the above-mentioned policy periods is approximately $4.0 million; however, our estimate of the potential range of these future claim amounts is between $2.0 million and $9.0 million. The actual amounts ultimately paid by us related to these claims, if any, may vary materially from the above range and could be impacted by further claims development and the extent to which the insurer can not honor its obligations. In any event, we do not expect any failure by this insurer to honor its obligations to us to have a material adverse impact on our financial condition; however, the impact could be material to our results of operations or cash flow in a given period.

      We are self-insured against potential liabilities. Although we maintain insurance policies with respect to automobile, general liability, workers’ compensation and employers’ liability, those policies are subject to deductibles of $1,000,000 to $2,000,000 per occurrence, and we are primarily self-insured for all claims that do not exceed the amount of the applicable deductible. We also maintain a non-union employee related health care benefit plan that is subject to a deductible of $250,000 per claimant per year. Losses up to the deductible amounts are accrued based upon our estimates of the ultimate liability for claims incurred and an estimate of claims incurred but not yet reported. However, insurance liabilities are difficult to assess and estimate due to unknown factors, including the severity of an injury, the determination of our liability in proportion to other parties, the number of incidents not reported and the effectiveness of our safety program. If we were to experience insurance claims or costs significantly above our estimates, our results of operations could be materially and adversely affected in a given period.

      We may incur liabilities or suffer negative financial impact relating to occupational health and safety matters. Our operations are subject to extensive laws and regulations relating to the maintenance of safe conditions in the workplace. While we have invested, and will continue to invest, substantial resources in our occupational health and safety programs, our industry involves a high degree of operational risk and there can be no assurance that we will avoid significant liability exposure. Although we have taken what we believe are appropriate precautions, we have suffered fatalities in the past and may suffer additional fatalities in the future. Claims for damages to persons, including claims for bodily injury or loss of life, could result in substantial costs and liabilities. In addition, if our safety record were to substantially deteriorate over time, our customers could cancel our contracts and not award us future business.

      Our use of percentage-of-completion accounting could result in a reduction or elimination of previously reported profits. As discussed in “Critical Accounting Policies” and in the notes to our consolidated financial statements included herein, a significant portion of our revenues is recognized on a percentage-of-completion method of accounting, using the cost-to-cost method. This method is used because management considers

expended costs to be the best available measure of progress on these contracts. This accounting method is standard for fixed-price contracts. The percentage-of-completion accounting practice we use results in our recognizing contract revenues and earnings ratably over the contract term in proportion to our incurrence of contract costs. The earnings or losses recognized on individual contracts are based on estimates of contract revenues, costs and profitability. Contract losses are recognized in full when determined, and contract profit estimates are adjusted based on ongoing reviews of contract profitability. Further, a substantial portion of our contracts contain various cost and performance incentives. Penalties are recorded when known or finalized, which is generally during the latter stages of the contract. In addition, we record cost recovery claims when we believe recovery is probable and the amounts can be reasonably estimated. Actual collection of claims could differ from estimated amounts and could result in a reduction or elimination of previously recognized earnings. In certain circumstances, it is possible that such adjustments could be significant.

      Our dependence upon fixed price contracts could adversely affect our business. We currently generate, and expect to continue to generate, a portion of our revenues under fixed price contracts. We must estimate the costs of completing a particular project to bid for fixed price contracts. The cost of labor and materials, however, may vary from the costs we originally estimated. These variations, along with other risks inherent in performing fixed price contracts, may cause actual revenue and gross profits for a project to differ from those we originally estimated and could result in reduced profitability or losses on projects. Depending upon the size of a particular project, variations from the estimated contract costs can have a significant impact on our operating results for any fiscal quarter or year.

      The industries we serve are subject to rapid technological and structural changes that could reduce the demand for the services we provide. The electric power, gas, telecommunications and cable television industries are undergoing rapid change as a result of technological advances that could, in certain cases, reduce the demand for our services or otherwise negatively impact our business. New or developing technologies could displace the wireline systems used for voice, video and data transmissions, and improvements in existing technology may allow telecommunications and cable television companies to significantly improve their networks without physically upgrading them.

      A portion of our business depends on our ability to provide surety bonds. We may be unable to compete for or work on certain projects if we are not able to obtain the necessary surety bonds. Surety market conditions are currently difficult as a result of significant losses incurred by many sureties in recent periods, both in the construction industry as well as in certain larger corporate bankruptcies. As a result, less bonding capacity is available in the market and terms have become more expensive and restrictive. We have posted a $10.0 million letter of credit to support our surety bond program and have granted security interests in various of our assets to collateralize our obligations to the surety. Further, under standard terms in the surety market, sureties issue or continue bonds on a project-by-project basis and can decline to issue bonds at any time or require the posting of additional collateral as a condition to issuing or renewing any bonds.

      Current or future market conditions, as well as changes in our surety’s assessment of our operating and financial risk, could cause our surety provider to decline to issue or renew, or substantially reduce the amount of, bonds for our work and could increase our bonding costs. These actions can be taken on short notice. If our surety provider were to limit or eliminate our access to bonding, our alternatives would include seeking bonding capacity from other sureties, finding more business that does not require bonds and posting other forms of collateral for project performance, such as letters of credit or cash. We may be unable to secure these alternatives in a timely manner, on acceptable terms, or at all. Accordingly, if we were to experience an interruption or reduction in the availability of bonding capacity, we may be unable to compete for or work on certain projects.

      Many of our contracts may be canceled on short notice, and we may be unsuccessful in replacing our contracts if they are cancelled or as they are completed or expire. We could experience a decrease in our revenue, net income and liquidity if any of the following occur:

      Many of our customers may cancel our contracts on short notice, typically 30-90 days, even if we are not in default under the contract. Certain of our customers assign work to us on a project-by-project basis under master service agreements. Under these agreements, our customers often have no obligation to assign a specific amount of work to us. Our operations could decline significantly if the anticipated volume of work is not assigned to us. Many of our contracts, including our master service contracts, are opened to public bid at the expiration of their terms. There can be no assurance that we will be the successful bidder on our existing contracts that come up for bid.

      We may be unsuccessful at integrating companies that we either have acquired or that we may acquire in the future. We cannot be sure that we can successfully integrate our acquired companies with our existing operations without substantial costs, delays or other operational or financial problems. If we do not implement proper overall business controls, our decentralized operating strategy could result in inconsistent operating and financial practices at the companies we acquire and our overall profitability could be adversely affected. Integrating our acquired companies involves a number of special risks which could have a negative impact on our business, financial condition and results of operations, including:

If one of our acquired companies suffers customer dissatisfaction or performance problems, the reputation of our entire company could suffer.

      The departure of key personnel could disrupt our business. We depend on the continued efforts of our executive officers and on senior management of the businesses we acquire. Although we have entered into employment agreements with terms of one to three years with most of our executive officers and certain other key employees, we cannot be certain that any individual will continue in such capacity for any particular period of time. The loss of key personnel, or the inability to hire and retain qualified employees, could negatively impact our ability to manage our business. We do not carry key-person life insurance on any of our employees.

      Our unionized workforce could adversely affect our operations and our ability to complete future acquisitions. As of December 31, 2004, approximately 46% of our employees were covered by collective bargaining agreements. Although the majority of these agreements prohibit strikes and work stoppages, we cannot be certain that strikes or work stoppages will not occur in the future. Strikes or work stoppages would adversely impact our relationships with our customers and could cause us to lose business and decrease our revenue. In addition, our ability to complete future acquisitions could be adversely affected because of our union status for a variety of reasons. For instance, our union agreements may be incompatible with the union agreements of a business we want to acquire and some businesses may not want to become affiliated with a union based company.

      Our business is labor intensive, and we may be unable to attract and retain qualified employees. Our ability to maintain our productivity and profitability will be limited by our ability to employ, train and retain skilled personnel necessary to meet our requirements. We may experience shortages of qualified journeyman linemen. We cannot be certain that we will be able to maintain an adequate skilled labor force necessary to operate efficiently and to support our growth strategy or that our labor expenses will not increase as a result of

a shortage in the supply of these skilled personnel. Labor shortages or increased labor costs could impair our ability to maintain our business or grow our revenues.

      Our business growth could outpace the capability of our corporate management infrastructure. We cannot be certain that our infrastructure will be adequate to support our operations as they expand. Future growth also could impose significant additional responsibilities on members of our senior management, including the need to recruit and integrate new senior level managers and executives. We cannot be certain that we can recruit and retain such additional managers and executives. To the extent that we are unable to manage our growth effectively, or are unable to attract and retain additional qualified management, we may not be able to expand our operations or execute our business plan.

      Our failure to comply with environmental laws could result in significant liabilities. Our operations are subject to various environmental laws and regulations, including those dealing with the handling and disposal of waste products, PCBs, fuel storage and air quality. We perform work in many different types of underground environments. If the field location maps supplied to us are not accurate, or if objects are present in the soil that are not indicated on the field location maps, our underground work could strike objects in the soil, some of which may contain pollutants. In such cases, these objects may rupture, resulting in the discharge of pollutants. If we are unable to obtain reimbursement from the parties providing the incorrect information, we may be liable for fines and damages. In addition, we perform directional drilling operations below certain environmentally sensitive terrains and water bodies. Due to the inconsistent nature of the terrain and water bodies, it is possible that such directional drilling may cause a surface fracture releasing subsurface materials. These releases may contain contaminants in excess of amounts permitted by law, potentially exposing us to remediation costs and fines. We own and lease several facilities at which we store our equipment. Some of these facilities contain fuel storage tanks which may be above or below ground. If these tanks were to leak, we could be responsible for the cost of remediation as well as potential fines.

      In addition, new laws and regulations, stricter enforcement of existing laws and regulations, the discovery of previously unknown contamination or leaks, or the imposition of new clean-up requirements could require us to incur significant costs or become the basis for new or increased liabilities that could harm our financial condition and results of operations. In certain instances, we have obtained indemnification or covenants from third parties (including predecessors or lessors) for such cleanup and other obligations and liabilities that we believe are adequate to cover such obligations and liabilities. However, such third-party indemnities or covenants may not cover all of our costs, and such unanticipated obligations or liabilities, or future obligations and liabilities, may have a material adverse effect on our business operations or financial condition. Further, we cannot be certain that we will be able to identify or be indemnified for all potential environmental liabilities relating to any acquired business.

      Opportunities within the government arena could lead to increased governmental regulation applicable to Quanta and unrecoverable start up costs. Most government contracts are awarded through a regulated competitive bidding process. As we pursue increased opportunities in the government arena management’s focus associated with the start up and bidding process may be diverted away from other opportunities. If we were to be successful in being awarded government contracts, a significant amount of costs could be required before any revenues were realized from these contracts. In addition, as a government contractor we would be subject to a number of procurement rules and other public sector liabilities, any deemed violation of which could lead to fines or penalties or a loss of business. Government agencies routinely audit and investigate government contractors. Government agencies may review a contractor’s performance under its contracts, cost structure, and compliance with applicable laws, regulations and standards. If government agencies determine through these audits or reviews that costs were improperly allocated to specific contracts, they will not reimburse the contractor for those costs or may require the contractor to refund previously reimbursed costs. If government agencies determine that we engaged in improper activity, we may be subject to civil and criminal penalties. In addition, if the government were to even allege improper activity, we also could experience serious harm to our reputation. Many government contracts must be appropriated each year. If appropriations are not made in subsequent years we would not realize all of the potential revenues from any awarded contracts.

      We may not be successful in continuing to meet the requirements of the Sarbanes-Oxley Act of 2002. The Sarbanes-Oxley Act of 2002 has introduced many requirements applicable to us regarding corporate governance and financial reporting, including the requirements, beginning with this 2004 Annual Report, for management to report on our internal controls over financial reporting and for our independent registered public accounting firm to attest to this report. During 2004, we continued actions to ensure our ability to comply with these requirements, including but not limited to, the engaging of outside experts to assist in the evaluation of our controls, adding staff to our internal audit department and documenting our existing controls. As of December 31, 2004, we were in compliance, however, there can be no assurance that we will be successful in complying in future years. Failure to maintain compliance could result in a decrease in the market value of our common stock and other publicly-traded securities, the reduced ability to obtain financing, the loss of customers, penalties and additional expenditures to meet the requirements.

      We may not have access in the future to sufficient funding to finance desired growth. If we cannot secure additional financing in the future on acceptable terms, we may be unable to support our growth strategy. We cannot readily predict the ability of certain customers to pay for past services or the timing, size and success of our acquisition efforts. Using cash for acquisitions limits our financial flexibility and makes us more likely to seek additional capital through future debt or equity financings. Our existing debt agreements contain significant restrictions on our operational and financial flexibility, including our ability to incur additional debt, and if we seek more debt we may have to agree to additional covenants that limit our operational and financial flexibility. When we seek additional debt or equity financings, we cannot be certain that additional debt or equity will be available to us on terms acceptable to us or at all.

      We may be unsuccessful at generating internal growth. Our ability to generate internal growth will be affected by, among other factors, our ability to:

      In addition, our customers may reduce the number or size of projects available to us due to their inability to obtain capital or pay for services provided. Many of the factors affecting our ability to generate internal growth may be beyond our control, and we cannot be certain that our strategies will be successful or that we will be able to generate cash flow sufficient to fund our operations and to support internal growth. If we are unsuccessful, we may not be able to achieve internal growth, expand our operations or grow our business.

      Our results of operations could be adversely affected as a result of goodwill impairments. When we acquire a business, we record an asset called “goodwill” equal to the excess amount we pay for the business, including liabilities assumed, over the fair value of the tangible and intangible assets of the business we acquire. Through December 31, 2001, pursuant to generally accepted accounting principles, we amortized this goodwill over its estimated useful life of 40 years following the acquisition, which directly impacted our earnings. The Financial Accounting Standards Board (FASB) issued Statement of Financial Accounting Standards (SFAS) No. 142 which provides that goodwill and other intangible assets that have indefinite useful lives not be amortized, but instead must be tested at least annually for impairment, and intangible assets that have finite useful lives should continue to be amortized over their useful lives. SFAS No. 142 also provides specific guidance for testing goodwill and other non-amortized intangible assets for impairment. SFAS No. 142 requires management to make certain estimates and assumptions to allocate goodwill to reporting units and to determine the fair value of reporting unit net assets and liabilities, including, among other things, an assessment of market conditions, projected cash flows, investment rates, cost of capital and growth rates, which could significantly impact the reported value of goodwill and other intangible assets. Fair value is determined using a combination of the discounted cash flow, market multiple and market

capitalization valuation approaches. Absent any impairment indicators, we perform our impairment tests annually during the fourth quarter. Future impairments, if any, will be recognized as operating expenses.

      A number of shares of our common stock are eligible for future sale, which may cause our stock price to decline. The market price of our common stock could decline as a result of sales of a large number of shares of common stock in the public market or the perception that such sales could occur. These sales, or the possibility that these sales may occur, also might make it more difficult for us to sell equity securities in the future at a time and at a price that we deem appropriate. Shares of common stock issued upon the conversion of our $270.0 million issuance of 4.5% convertible subordinated notes could cause substantial dilution to existing stockholders, which could cause the market price of our common stock to decline.

      First Reserve Fund IX, L.P., which owned approximately 15.2 million shares of our common stock as of December 31, 2004 has the ability to cause us to register the resale of its shares under its investor’s rights agreement. First Reserve Fund IX, L.P. may also sell such shares in the open market subject to the volume, manner of sale and other conditions of Rule 144.

      You are unlikely to be able to seek remedies against Arthur Andersen LLP, our former independent auditor. Our consolidated financial statements for the fiscal years ended prior to December 31, 2002 were audited by Arthur Andersen LLP, our former independent auditor. In June 2002 Arthur Andersen LLP was convicted of federal obstruction of justice charges in connection with its destruction of documents. As a result of its conviction, Arthur Andersen LLP has ceased operations. You will not be able to recover against Arthur Andersen LLP for its liability under Section 11 of the Securities Act in the event of any untrue statements of a material fact contained in the periods covered by its previously issued audit reports. Even if you have a basis for asserting a remedy against, or seeking to recover from Arthur Andersen LLP, because they have ceased operations, it is highly unlikely that you would be able to recover damages from Arthur Andersen LLP.

      Certain provisions of our corporate governing documents could make an acquisition of our company more difficult. The following provisions of our certificate of incorporation and bylaws, as currently in effect, as well as our stockholder rights plan and Delaware law, could discourage potential proposals to acquire us, delay or prevent a change in control of us or limit the price that investors may be willing to pay in the future for shares of our common stock:

Facilities

      We lease our corporate headquarters in Houston, Texas and maintain offices nationwide. This space is used for offices, equipment yards, warehousing, storage and vehicle shops. We own 32 of the facilities we occupy, all of which are encumbered by our credit facility, and we lease the remainder. We believe that our existing facilities are sufficient for our current needs.

Equipment

      We operate a fleet of owned and leased trucks and trailers, support vehicles and specialty construction equipment, such as backhoes, excavators, trenchers, generators, boring machines, cranes, wire pullers and tensioners, all of which are encumbered by our credit facility. As of December 31, 2004, the total size of the rolling-stock fleet was approximately 19,600 units. Most of this fleet is serviced by our own mechanics who work at various maintenance sites and facilities. We believe that these vehicles generally are well maintained and adequate for our present operations.

      We are from time to time a party to various lawsuits, claims and other legal proceedings that arise in the ordinary course of business. These actions typically seek, among other things, compensation for alleged personal injury, breach of contract, property damage, punitive damages, civil penalties or other losses, or injunctive or declaratory relief. With respect to all such lawsuits, claims and proceedings, we accrue reserves when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. We do not believe that any of these proceedings, separately or in the aggregate would be expected to have a material adverse effect on our results of operations, cash flow or financial position.

      During the fourth quarter of the year covered by this report, no matters were submitted to a vote of our security holders, through the solicitation of proxies or otherwise.

PART II

      Our common stock is listed on the New York Stock Exchange (NYSE) under the symbol “PWR.” The following table sets forth the high and low sales prices of our common stock per quarter, as reported by the NYSE, for the two most recent fiscal years.

      On March 10, 2005, there were 933 holders of record of our common stock and 22 holders of record of our Limited Vote Common Stock. There is no established trading market for the Limited Vote Common Stock; however, the Limited Vote Common Stock converts into common stock immediately upon sale.

Stock Repurchase

      On November 28, 2004, 8,749 shares of restricted stock that had been issued pursuant to our 2001 Stock Incentive Plan vested. Pursuant to the 2001 Stock Incentive Plan, employees may elect to satisfy their tax withholding obligations upon vesting by having us make such tax payments and withhold a number of vested

shares having a value on the date of vesting equal to their tax withholding obligation. As a result of such employee elections, we withheld shares as follows and accounted for such shares as treasury stock.

ISSUER PURCHASES OF EQUITY SECURITIES

Dividends

      We currently intend to retain our future earnings, if any, to finance the growth, development and expansion of our business. Accordingly, we do not currently intend to declare or pay any cash dividends on our common stock in the immediate future. The declaration, payment and amount of future cash dividends, if any, will be at the discretion of our board of directors after taking into account various factors. These factors include our financial condition, results of operations, cash flows from operations, current and anticipated capital requirements and expansion plans, the income tax laws then in effect and the requirements of Delaware law. In addition, our revolving credit facility includes limitations on the payment of cash dividends without the consent of the lenders.

      The following historical selected financial data has been derived from the audited financial statements of the company. The historical financial statement data reflects the acquisitions of businesses accounted for as purchase transactions as of their respective acquisition dates. The historical selected financial data should be read in conjunction with the historical Consolidated Financial Statements and related notes thereto included in Item 8 “Financial Statements and Supplementary Data.”

      The consolidated financial statements for the years ended December 31, 2000 and 2001, were audited by Arthur Andersen LLP, which has ceased operations.

      The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our historical consolidated financial statements and related notes thereto in Item 8 “Financial Statements and Supplementary Data.” The discussion below contains forward-looking statements that are based upon our current expectations and are subject to uncertainty and changes in circumstances. Actual results may differ materially from these expectations due to inaccurate assumptions and known or unknown risks and uncertainties, including those identified in “Uncertainty of Forward-Looking Statements and Information.”

Introduction

      We are a leading national provider of specialty contracting services, offering end-to-end network solutions to the electric power, gas, telecommunications, cable television and specialty services industries. We believe that we are the largest contractor servicing the transmission and distribution sector of the North American electric utility industry. We derive our revenues from one reportable segment. Our customers include electric power, gas, telecommunications and cable television companies, as well as commercial, industrial and governmental entities. We had consolidated revenues for the year ended December 31, 2004 of $1.6 billion, of which 64.7% was attributable to electric power and gas customers, 16.8% to telecommunications and cable television operators and 18.5% to ancillary services, such as inside electrical wiring, intelligent traffic networks, cable and control systems for light rail lines, airports and highways, and specialty rock trenching, directional boring and road milling for industrial and commercial customers.

      Our customers include many of the leading companies in the industries we serve. We have developed strong strategic alliances with numerous customers, and strive to develop and maintain our status as a preferred vendor to our customers. We enter into various types of contracts including competitive unit price, cost-plus (or time and materials basis), and fixed price (or lump sum basis), the final terms and prices of which we frequently negotiate with the customer. Although the terms of our contracts vary considerably, most are made on either a unit price or fixed price basis in which we agree to do the work for a price per unit of work performed (unit price) or for a fixed amount for the entire project (fixed price). We complete a substantial majority of our fixed price projects within one year, while we frequently provide maintenance and repair work under open-ended, unit price or cost-plus master service agreements that are renewable annually. Some of our customers require us to post performance and payment bonds upon execution of the contract, depending upon the nature of the work to be performed.

      We generally recognize revenue on our unit price and cost-plus contracts when units are completed or services are performed. For our fixed price contracts, we typically record revenues as work on the contract progresses on a percentage-of-completion basis. Under this valuation method, revenue is recognized based on the percentage of total costs incurred to date in proportion to total estimated costs to complete the contract. Fixed price contracts generally include retainage provisions under which a percentage of the contract price is withheld until the project is complete and has been accepted by our customer.

Seasonality; Fluctuations of Results

      Our revenues and results of operations can be subject to seasonal variations. These variations are influenced by weather, customer spending patterns, bidding seasons, and holidays. Typically, our revenues are lowest in the first quarter of the year because cold, snowy, or wet conditions cause delays, and the annual project bidding season is just beginning. The second quarter is typically better than the first, as some projects begin, but continued cold and wet weather can often impact second quarter productivity. The third quarter is typically the best of the year, as a greater number of projects are underway and weather is more accommodating to work on projects. Revenues during the fourth quarter of the year are typically lower than the third quarter, but higher than the second quarter. Many projects are completed in the fourth quarter and revenues are often positively impacted by customers seeking to spend their capital budget before the end of the year, however, the holiday season and inclement weather can sometimes cause delays. Our quarterly revenue and results of operations during 2004 were consistent with these seasonal patterns. We had not experienced these normal seasonal patterns for the last few years due to the decline in the telecommunications and cable television industry and inconsistent spending patterns from the utility industry as many of our customers have dealt with challenging economic and capital market conditions.

      Additionally, our industry can be highly cyclical. As a result, our volume of business may be adversely affected by declines in new projects in various geographic regions in the United States. The financial condition of our customers and their access to capital, variations in the margins of projects performed during any particular quarter, regional economic conditions, timing of acquisitions and the timing and magnitude of acquisition assimilation costs may also materially affect quarterly results. Accordingly, our operating results in any particular quarter or year may not be indicative of the results that can be expected for any other quarter or

for any other year. You should read “Outlook” and “Understanding Margins” for additional discussion of trends and challenges that may affect our financial condition and results of operations.

Understanding Margins

      Our gross margin is gross profit expressed as a percentage of revenues. Cost of services consists primarily of salaries, wages and benefits to employees, depreciation, fuel and other equipment expenses, equipment rentals, subcontracted services, insurance, facilities expenses, materials and parts and supplies. Various factors — some controllable, some not — impact our gross margins on a quarterly or annual basis.

      Seasonal & Geographical. As discussed above, seasonal patterns can have a significant impact on gross margins. Generally, business is slower in the winter months versus the warmer parts of the year. This can be offset somewhat by increased demand for electrical service and repair work from severe weather. In addition, the mix of business conducted in different parts of the country will affect margins; some parts of the country command higher gross margins than others.

      Weather. Adverse or favorable weather conditions can impact gross margins in a given period. For example, in the first quarter of 2004, parts of the country experienced record snow or rain fall that negatively impacted our revenue and gross margin. In many cases projects were delayed or had to be temporarily placed on hold. Conversely, in periods where weather remains dry and temperatures are accommodating, more work can be done, sometimes with less cost, which would have a favorable impact on gross margin. In some cases, as in the second half of 2004, strong storms or hurricanes can provide us with high margin emergency service restoration work, which has a positive impact on margins.

      Revenue Mix. The mix of revenue derived from the industries we serve will impact gross margins. Changes in our customers’ spending patterns in each of the industries we serve can cause an imbalance in supply and demand, and therefore, affect margins and mix of revenue by industry served.

      Service and Maintenance versus Installation. In general, installation work has a higher gross margin than maintenance work. This is because installation work is often obtained on a fixed price basis which has higher risk than other types of pricing arrangements. We typically derive approximately 40%-50% of our revenue from maintenance work, which is performed under pre-established or negotiated prices or cost plus pricing arrangements. Thus, a higher portion of installation work in a given quarter may lead to a higher gross margin.

      Subcontract Work. Work that has to be subcontracted out generally has lower gross margins. An increase in subcontract work in a given period may contribute to a decrease in gross margin. We typically derive approximately 15% of our revenue from work that is subcontracted out to other contractors.

      Materials versus Labor. Margins may be lower on projects on which we furnish materials as material prices are generally more predictable than labor costs. Consequently, we generally are not able to mark up materials as much as labor costs. In a given period, a higher percentage of work that has a higher materials component may decrease overall gross margin.

      Depreciation. We include depreciation in cost of services. This is common practice in our industry, but can make comparability to other companies difficult. This must be taken into consideration when comparing us to other companies.

      Insurance. Operating margins could be impacted by fluctuations in insurance accruals related to our deductibles in the period in which such adjustments are made. As of December 31, 2004, we have a deductible of $1,000,000 per occurrence related to employer’s and general liability and a deductible of $2,000,000 per occurrence for automobile liability and workers’ compensation insurance. We also have a non-union employee related health care benefit plan that is subject to a deductible of $250,000 per claimant per year.

      Selling, General and Administrative Expenses. Selling, general and administrative expenses consist primarily of compensation and related benefits to management, administrative salaries and benefits, marketing, office rent and utilities, communications, professional fees, bad debt expense, letter of credit fees and gains

and losses on the sale of property and equipment. Selling, general and administrative expenses can be impacted by our customers’ inability to pay for services performed.

Results of Operations

      The following table sets forth selected statements of operations data and such data as a percentage of revenues for the years indicated (dollars in thousands):

2004 compared to 2003

      Revenues. Revenues were relatively constant at approximately $1.6 billion for the year ended December 31, 2004 compared to the year ended December 31, 2003. Revenues derived from the telecommunications and cable television network services industry decreased by approximately $86.5 million. This revenue decrease was primarily due to reduced capital spending by our cable customers as many of them continue to face significant financial pressures, which have negatively impacted the award of work to specialty contractors. Revenues derived from ancillary services decreased by approximately $3.0 million. These decreases were partially offset by increased revenues derived from the electric power and gas network services industry of approximately $73.2 million. Revenues were positively impacted by a larger volume of storm restoration services provided during the third quarter of 2004 to our electric power and gas customers in the Southeastern United States in the wake of four hurricanes. We have also become more selective in the jobs we pursue, and pricing pressures have contributed to lower revenues as the bidding environment has remained competitive.

      Gross Profit. Gross profit decreased $18.5 million, or 9.3%, to $181.4 million for the year ended December 31, 2004. Gross margin decreased from 12.2% for the year ended December 31, 2003 to 11.2% for the year ended December 31, 2004. This decrease in gross margin resulted primarily from an incremental increase in the expense associated with our self-insured casualty insurance program of $13.0 million primarily due to higher than anticipated claims development during the third quarter of 2004. Additional negative margin impacts include pricing pressures on work performed for utility and cable customers, as well as cost overruns and weather delays on certain projects during the first quarter of 2004. These decreases were partially offset by a larger volume of higher margin storm restoration services performed during the third quarter of 2004.

      Selling, general and administrative expenses. Selling, general and administrative expenses decreased $6.7 million, or 3.7%, to $171.5 million for the year ended December 31, 2004. During the year ended December 31, 2003, we recorded $19.9 million in bad debt expense related primarily to notes receivable from one customer, compared to only $0.4 million during the year ended December 31, 2004. Excluding bad debt expense, selling, general and administrative expenses for the year ended December 31, 2004 increased approximately $12.8 million, primarily due to $9.3 million in increased professional fees which consisted of $6.3 million in fees associated with meeting the requirements of the Sarbanes-Oxley Act of 2002 and additional professional fees associated with a margin enhancement program, costs associated with the start up of our government solutions subsidiary, legal fees and the implementation of new safety initiatives. In addition, our non-cash compensation expense associated with the issuance of restricted stock increased $1.9 million for the year ended December 31, 2004 compared to the year ended December 31, 2003.

      Interest expense. Interest expense decreased $6.8 million, or 21.2%, to $25.1 million for the year ended December 31, 2004 due to the refinancing of the majority of our outstanding debt during the fourth quarter of 2003 at lower interest rates and a decrease in our long-term debt balance as of December 31, 2004 compared to December 31, 2003.

      Other income (expense), net. Other income was $2.6 million for the year ended December 31, 2004, compared to other expense of $1.4 million for the year ended December 31, 2003. Included in 2003 was a $2.9 million loss on the disposal of an investment in a fiber network. Excluding this loss, the increase in other income (expense), net was $1.1 million, primarily related to an increase in interest income resulting from larger average cash balances during 2004.

      Benefit for income taxes. The benefit for income taxes was $3.5 million for the year ended December 31, 2004, with an effective tax rate of 27.3%, compared to a benefit of $18.1 million for the year ended December 31, 2003, with an effective tax rate of 34.1%. The effective tax rates for both 2004 and 2003 were lower than the statutory rates due to the effect of certain expenses that we incur that are not deductible for tax purposes. The non-deductibility of these expenses has the effect of lowering the amount of tax benefit that we record associated with the losses we incurred.

2003 compared to 2002

      Revenues. Revenues decreased $107.9 million, or 6.2%, to $1.6 billion for the year ended December 31, 2003, with revenues derived from the telecommunications and cable television network services industry decreasing by approximately $130.4 million. This decrease was partially offset by increases in revenues derived from the electric power and gas network services industry of approximately $7.5 million and revenues from ancillary services increasing approximately $15.1 million. The overall decrease was due to the continued reduction in capital spending by our customers, which negatively impacted the award of work to specialty contractors. Pricing pressures have also contributed to lower revenues as the competitive bid environment for new projects has become increasingly competitive.

      Gross profit. Gross profit decreased $36.9 million, or 15.6%, to $199.9 million for the year ended December 31, 2003. As a percentage of revenues, gross margin decreased from 13.5% for the year ended December 31, 2002 to 12.2% for the year ended December 31, 2003. The decrease in gross margin was attributable to the negative impact of the factors affecting revenue noted above, shutdowns, delays and

substantial operating inefficiencies resulting from severe snowfall in the Northeast and Mountain regions of the United States during the first quarter of 2003 and substantially higher than normal rainfall amounts in the South and Southeast during the first and second quarters of 2003, partially offset by increased margins on revenues earned from telecommunications customers.

      Selling, general and administrative expenses. Selling, general and administrative expenses decreased $51.2 million, or 22.3%, to $178.2 million for the year ended December 31, 2003. During the year ended December 31, 2003, we recorded $19.9 million in bad debt expense. During the year ended December 31, 2002, we recorded $35.7 million in bad debt expense, $10.5 million in proxy defense costs and $4.5 million in expensed loan and equity costs associated with amendments of our then existing debt agreements and issuances of stock. Absent these items, selling, general and administrative expenses for the year ended December 31, 2003 decreased $20.4 million primarily due to reductions in salary and benefit costs, facility related costs and travel and entertainment costs as a result of reductions in personnel and the closure of certain offices and to lower net losses on the sale of property and equipment during 2003 compared to during 2002.

      Goodwill impairment. During the year ended December 31, 2003, we recognized a non-cash SFAS No. 142 goodwill impairment charge of $6.5 million. During the year ended December 31, 2002, we recognized an interim non-cash SFAS No. 142 goodwill impairment charge of $166.6 million.

      Interest expense. Interest expense decreased $4.0 million, or 11.3%, to $31.8 million for the year ended December 31, 2003. This decrease was due to lower average levels of debt in 2003 and an expense of approximately $1.0 million for unamortized debt issuance costs relating to an amendment of the credit facility charged to interest expense during the year ended December 31, 2002. These decreases were partially offset by increased interest rates.

      Loss on early extinguishment of debt. During the year ended December 31, 2003, we recognized $35.1 million on loss on early extinguishment of debt comprised of make-whole prepayment premiums in the amount of $31.3 million, the write-off of unamortized debt issuance costs of $3.3 million associated with the retirement of certain other debt and the termination of a previous credit facility together with other related costs of $0.5 million.

      Benefit for income taxes. The benefit for income taxes was $18.1 million for the year ended December 31, 2003, with an effective tax rate of 34.1%, compared to a benefit of $19.7 million for the year ended December 31, 2002, with an effective tax rate of 10.2%. The 2002 annual effective tax rate reflects a benefit for income taxes at a rate that is lower than the 2003 annual effective tax rate primarily due to the significant 2002 interim goodwill impairment charge, the majority of which was not deductible for tax purposes, thereby reducing the amount of tax benefit recorded for the year ended December 31, 2002.

      Dividends on preferred stock, net of forfeitures. For the year ended December 31, 2003, we recorded approximately $2.1 million in forfeitures of dividends on the Series A Convertible Preferred Stock. In the first quarter of 2003, all remaining outstanding shares of Series A Convertible Preferred Stock were converted into shares of common stock. There are currently no outstanding shares of Series A Convertible Preferred Stock and the series was eliminated during the second quarter of 2003. Any dividends that had accrued on the respective shares of Series A Convertible Preferred Stock were reversed on the date of conversion.

Liquidity and Capital Resources

      We anticipate that our cash on hand, which totaled $265.6 million as of December 31, 2004, our credit facility and our future cash flow from operations will provide sufficient cash to enable us to meet our future operating needs, debt service requirements and planned capital expenditures and to ensure our future ability to grow. Momentum in deployment of fiber to the premises or initiatives to rebuild the United States electric power grid might require a significant amount of additional working capital. However, we feel that we have adequate cash and availability under our credit facility to meet such needs.

      As of December 31, 2004, we had cash and cash equivalents of $265.6 million, working capital of $479.0 million and long-term debt of $464.4 million, net of current maturities. Our long-term debt balance at that date included borrowings of $442.5 million of convertible subordinated notes and $21.9 million of other debt. We also had $132.8 million of letters of credit outstanding under our credit facility.

      During the year ended December 31, 2004, operating activities provided net cash flow of $144.1 million. Cash flow from operations is primarily influenced by demand for our services, operating margins and the type of services we provide. The receipt of a federal tax refund of $30.2 million and $23.5 million received from the sale of our receivable due from Adelphia positively impacted cash flow from operating activities during the year ended December 31, 2004. We used net cash in investing activities of $25.1 million, including $39.0 million used for capital expenditures, partially offset by an $8.9 million reduction in restricted cash no longer required by our casualty insurance program, coupled with $4.9 million of proceeds from the sale of equipment. We used net cash in financing activities of $33.0 million, resulting primarily from a $35.2 million repayment under the term loan portion of the credit facility in order to be able to issue additional letters of credit.

      As of December 31, 2004, we had a $185.0 million credit facility with various lenders. The credit facility consisted of a $150.0 million letter of credit facility maturing on June 19, 2008, which also provides for term loans, and a $35.0 million revolving credit facility maturing on December 19, 2007, which provides for revolving loans and letters of credit. On January 4, 2005, the maximum availability under the letter of credit facility was automatically reduced by $1.5 million, resulting in current maximum availability of $183.5 million, and will be automatically reduced by $1.5 million on December 31 of each year thereafter.

      As of December 31, 2004, the letter of credit facility was linked to a $150.0 million deposit made by the lenders, which is held in an account with Bank of America, N.A. This deposit may be used either to support letters of credit or, to the extent that amounts available under the facility are not used to support letters of credit, for term loans. As of December 31, 2004, we were required to maintain total borrowings outstanding under the letter of credit facility equal to the $150.0 million available through a combination of letters of credit or term loans. We had approximately $128.9 million of letters of credit issued under the letter of credit facility and $20.8 million of the letter of credit facility outstanding as a term loan. The remaining $0.3 million was available for issuing new letters of credit. In the event that we desire to issue additional letters of credit under the letter of credit facility, we are required to make cash repayments of debt outstanding under the term loan portion of the letter of credit facility in an amount that approximates the additional letters of credit to be issued. The weighted average interest rate for the years ended December 31, 2003 and 2004 associated with amounts outstanding under the term loan was 4.15% and 4.44%.

      Under the letter of credit facility, we are subject to a fee equal to 3.00% to 3.25% of the letters of credit outstanding, depending upon the occurrence of certain events, plus an additional 0.15% of the amount outstanding to the extent the funds in the deposit account do not earn interest equal to the London Interbank Offering Rate (LIBOR). Term loans under the letter of credit facility bear interest at a rate equal to either (a) the Eurodollar Rate (as defined in the credit facility) plus 3.00% to 3.25% or (b) the Base Rate (as described below) plus 3.00% to 3.25% depending upon the occurrence of certain events. The Base Rate equals the higher of (i) the Federal Funds Rate (as defined in the credit facility) plus 1/2 of 1% and (ii) the bank’s prime rate.

      We had approximately $3.9 million of letters of credit issued under the revolving credit facility, and borrowing availability under the revolving credit facility was $31.1 million as of December 31, 2004. Amounts borrowed under the revolving credit facility bear interest at a rate equal to either (a) the Eurodollar Rate plus 1.75% to 3.00%, as determined by the ratio of our total funded debt to EBITDA, or (b) the Base Rate plus 0.25% to 1.50%, as determined by the ratio of our total funded debt to EBITDA. Letters of credit issued under

the revolving credit facility are subject to a letter of credit fee of 1.75% to 3.00%, based on the ratio of our total funded debt to EBITDA. If we choose to cash collateralize letters of credit issued under the revolving credit facility, those letters of credit will be subject to a letter of credit fee of 0.50%. We are also subject to a commitment fee of 0.375% to 0.625%, based on the ratio of our total funded debt to EBITDA, on any unused availability under the revolving credit facility.

      The credit facility contains certain covenants, including a maximum funded debt to EBITDA ratio, a maximum senior debt to EBITDA ratio, a minimum interest coverage ratio, a minimum asset coverage ratio and a minimum consolidated net worth covenant. As of December 31, 2004, we were in compliance with all of our covenants. However, other conditions such as, but not limited to, unforeseen project delays or cancellations, adverse weather conditions or poor contract performance, could adversely affect our ability to comply with our covenants in the future. The credit facility also limits acquisitions, capital expenditures and asset sales and, subject to some exceptions, prohibits liens on material assets, stock repurchase programs and the payment of dividends (other than dividend payments or other distributions payable solely in capital stock). Currently, however, the credit facility allows us to pay dividends and engage in stock repurchase programs in the amount of $25.0 million in 2005 and in any fiscal year thereafter in an aggregate amount up to twenty-five percent of our consolidated net income (plus the amount of non-cash charges that reduced such consolidated net income) for the prior fiscal year. The credit facility carries cross-default provisions with all of our other debt instruments exceeding $2.0 million in borrowings.

      The credit facility is secured by a pledge of all of the capital stock of our U.S. subsidiaries, 65% of the capital stock of our foreign subsidiaries and substantially all of our assets. Borrowings under the credit facility are to be used for working capital, capital expenditures and for other general corporate purposes. Our U.S. subsidiaries guarantee the repayment of all amounts due under the credit facility. Our obligations under the credit facility constitute designated senior indebtedness under our 4.0% and 4.5% convertible subordinated notes.

      As of December 31, 2004, we had $172.5 million of 4.0% convertible subordinated notes outstanding. These 4.0% convertible subordinated notes are convertible into shares of our common stock at a price of $54.53 per share, subject to adjustment as a result of certain events. These 4.0% convertible subordinated notes require semi-annual interest payments on July 1 and December 31 until the notes mature on July 1, 2007. Since July 3, 2003, we have had the option to redeem some or all of the 4.0% convertible subordinated notes at specified redemption prices, together with accrued and unpaid interest; however, redemption is prohibited by our credit facility. If certain fundamental changes occur, as described in the indenture under which we issued the 4.0% convertible subordinated notes, holders of the 4.0% convertible subordinated notes may require us to purchase all or part of their notes at a purchase price equal to 100% of the principal amount, plus accrued and unpaid interest.

      As of December 31, 2004, we had $270.0 million of 4.5% convertible subordinated notes outstanding. These 4.5% convertible subordinated notes are convertible into shares of our common stock at a price of $11.14 per share, subject to adjustment as a result of certain events. The 4.5% convertible subordinated notes require semi-annual interest payments on April 1 and October 1, until the notes mature on October 1, 2023.

      The 4.5% convertible subordinated notes are convertible by the holder if (i) during any fiscal quarter commencing after December 31, 2003 the last reported sale price of our common stock is greater than or equal to 120% of the conversion price for at least 20 trading days in the period of 30 consecutive trading days ending on the first trading day of such fiscal quarter, (ii) during the five business day period after any five consecutive trading day period in which the trading price per note for each day of that period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate, (iii) upon us calling the notes for redemption or (iv) upon the occurrence of specified corporate transactions. If the notes become convertible under one of these circumstances, we have the option to deliver cash, shares of our common stock

or a combination thereof, with a value equal to the par value of the notes divided by the conversion price multiplied by the average trading price of our common stock. The maximum number of shares of common stock that could be issued under these circumstances is equal to the par value of the notes divided by the conversion price. During the year ended December 31, 2004, none of the circumstances permitting conversion had occurred.

      Beginning October 8, 2008, we can redeem for cash some or all of the 4.5% convertible subordinated notes at par value plus accrued and unpaid interest; however, early redemption is prohibited by our credit facility. The holders of the 4.5% convertible subordinated notes may require us to repurchase all or some of the notes at par value plus accrued and unpaid interest on October 1, 2008, 2013 or 2018, or upon the occurrence of a fundamental change, as defined by the indenture under which we issued the notes. We must pay any required repurchase on October 1, 2008 in cash. For all other required repurchases, we have the option to deliver cash, shares of our common stock or a combination thereof to satisfy our repurchase obligation. We presently do not anticipate using stock to satisfy any future obligations. If we were to satisfy the obligation with shares of our common stock, we will deliver a number of shares equal to the par value of the notes divided by 98.5% of the average trading price of our common stock, as defined by the indenture. The number of shares of common stock issuable by us under this circumstance is not limited. Our right to satisfy a required repurchase obligation with shares of common stock can be surrendered by us. The 4.5% convertible subordinated notes carry cross-default provisions with our credit facility and any other debt instrument that exceeds $10.0 million in borrowings.

      As is common in our industry, we have entered into certain off-balance sheet arrangements in the ordinary course of business that result in risks not directly reflected in our balance sheets. Our significant off-balance sheet transactions include liabilities associated with non-cancelable operating leases, letter of credit obligations and surety guarantees. We have not engaged in any off-balance sheet financing arrangements through special purpose entities.

      We enter into non-cancelable operating leases for many of our facility, vehicle and equipment needs. These leases allow us to conserve cash by paying a monthly lease rental fee for use of facilities, vehicles and equipment rather than purchasing them. We may decide to cancel or terminate a lease before the end of its term, in which case we are typically liable to the lessor for the remaining lease payments under the term of the lease.

      We have guaranteed the residual value of the underlying assets under certain of our equipment operating leases at the date of termination of such leases. We have agreed to pay any difference between this residual value and the fair market value of each underlying asset as of the lease termination date. As of December 31, 2004, the maximum guaranteed residual value would have been approximately $100.2 million. We believe that no significant payments will be made as a result of the difference between the fair market value of the leased equipment and the guaranteed residual value. However, there can be no assurance that future significant payments will not be required.

      Certain of our vendors require letters of credit to ensure reimbursement for amounts they are disbursing on our behalf, such as to beneficiaries under our self-funded insurance programs. In addition, from time to time some customers require us to post letters of credit to ensure payment to our subcontractors and vendors under those contracts and to guarantee performance under our contracts. Such letters of credit are generally issued by a bank or similar financial institution. The letter of credit commits the issuer to pay specified amounts to the holder of the letter of credit if the holder demonstrates that we have failed to perform specified actions. If this were to occur, we would be required to reimburse the issuer of the letter of credit. Depending on the circumstances of such a reimbursement, we may also have to record a charge to earnings for the

reimbursement. We do not believe that it is likely that any claims will be made under a letter of credit in the foreseeable future.

      As of December 31, 2004, we had $132.8 million in letters of credit outstanding under our credit facility primarily to secure obligations under our casualty insurance program. These are irrevocable stand-by letters of credit with maturities expiring at various times throughout 2005 and 2006. Upon maturity, it is expected that the majority of these letters of credit will be renewed for subsequent one-year periods. We will be required to issue additional letters of credit during 2005, primarily related to our casualty insurance program.

      Many customers, particularly in connection with new construction, require us to post performance and payment bonds issued by a financial institution known as a surety. These bonds provide a guarantee to the customer that we will perform under the terms of a contract and that we will pay subcontractors and vendors. If we fail to perform under a contract or to pay subcontractors and vendors, the customer may demand that the surety make payments or provide services under the bond. We must reimburse the surety for any expenses or outlays it incurs. We have posted a letter of credit in the amount of $10.0 million in favor of the surety and, pursuant to the consent of our lenders under our credit facility, we have granted security interests in certain of our assets to fully collateralize our obligations to the surety. We may be required to post additional letters of credit or other collateral in favor of the surety in the future. Posting letters of credit in favor of the surety will also reduce the availability under our credit facility. To date, we have not had any significant reimbursements to our surety for bond-related costs. We currently believe that we will not have to fund any claims under our surety arrangements in the foreseeable future. As of December 31, 2004, an aggregate of approximately $481.5 million in original face amount of bonds issued by the surety were outstanding. Our estimated cost to complete these bonded projects was approximately $80.4 million as of December 31, 2004.

      As of December 31, 2004, our future contractual obligations are as follows (in thousands):

      Excluded from the above table is interest associated with borrowings under the credit facility because both the amount borrowed and applicable interest rate are variable. The principal amount borrowed under the credit facility included in the above table is $20.8 million due in 2008, which bears interest at a rate of 4.44% as of December 31, 2004. In addition, our multi-employer pension plan contributions are determined annually based on our union employee payrolls, which cannot be determined for future periods in advance.

      We grant credit under normal payment terms, generally without collateral, to our customers, which include electric power and gas companies, telecommunications and cable television system operators, governmental entities, general contractors, and builders, owners and managers of commercial and industrial properties located primarily in the United States. Consequently, we are subject to potential credit risk related to changes in business and economic factors throughout the United States. However, we generally have certain lien rights with respect to services provided. Under certain circumstances such as foreclosures or negotiated settlements, we may take title to the underlying assets in lieu of cash in settlement of receivables. As previously discussed herein, our customers have experienced significant financial difficulties. These

economic conditions expose us to increased risk related to collectibility of receivables for services we have performed. No customer accounted for more than 10% of accounts receivable or revenues as of or for the years ended December 31, 2003 or 2004.

      Quanta is from time to time party to various lawsuits, claims and other legal proceedings that arise in the ordinary course of business. These actions typically seek, among other things, compensation for alleged personal injury, breach of contract, property damage, punitive damages, civil penalties or other losses, or injunctive or declaratory relief. With respect to all such lawsuits, claims and proceedings, Quanta accrues reserves when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. Quanta does not believe that any of these proceedings, separately or in the aggregate, would be expected to have a material adverse effect on Quanta’s results of operations, cash flow or financial position.

      In the normal course of business, we enter into transactions from time to time with related parties. These transactions typically take the form of facility leases with prior owners of certain acquired companies.

Inflation

      Due to relatively low levels of inflation experienced during the years ended December 31, 2002, 2003 and 2004, inflation did not have a significant effect on our results.

New Accounting Pronouncements

      In September 2004, the Emerging Issues Task Force (EITF) discussed EITF Issue 04-08, “Accounting Issues Related to Certain Features of Contingently Convertible Debt and the Effect on Diluted Earnings per Share.” The EITF reached a consensus that would require all issued securities with contingent conversion features containing market price contingencies based on a company’s stock price to be accounted for using the “if converted” method in calculating earnings per share. This EITF would require that earnings per share be retroactively restated for the effect of conversion of any contingently convertible debt instruments starting with the issuance date of the contingently convertible debt instrument. This consensus is effective for us on December 31, 2004. Our 4.5% convertible subordinated notes contain contingent conversion features; however the adoption of EITF 04-08 does not impact our earnings per share as reported as the effect of assuming conversion of the 4.5% convertible subordinated notes would be antidilutive for all periods since the date of issuance. However, the effect of this EITF increases the likelihood that these notes could have a dilutive effect in the future.

      In December 2004, the Financial Accounting Standards Board (FASB) issued Statement of Financial Accounting Standards (SFAS) No. 123 (revised 2004), “Share-Based Payment.” (SFAS No. 123R). SFAS No. 123R requires companies to recognize an expense for the value of employee stock-based compensation. Cost of our stock option awards under our 2001 Stock Incentive Plan and stock issued pursuant to our Employee Stock Purchase Plan (ESPP) will be measured at fair value on the awards grant date, based on the estimated number of awards that are expected to vest. Companies are to select from three transition methods. We are currently evaluating the three transition methods for adopting SFAS No. 123R. SFAS No. 123R is effective for interim and annual periods beginning after June 15, 2005. Our existing pro forma disclosure included in Note 2 of the Notes to Consolidated Financial Statements presents the approximate impact of SFAS No. 123R had it been adopted in the periods presented. We continue to assess the impact of adopting SFAS No. 123R, including the need for changes in our compensation strategies. Statement No. 123R also requires the benefits of tax deductions in excess of recognized compensation cost to be reported as a financing cash flow, rather than as an operating cash flow as required under current literature. This requirement will reduce net operating cash flows and increase net financing cash flows in periods after adoption.

      In December 2004, the FASB issued Statement of Financial Accounting Standards (SFAS) No. 153, “Exchanges of Nonmonetary Assets — an amendment of APB Opinion No. 29,” which modifies the existing guidance on accounting for nonmonetary transactions in Accounting Principles Board Opinion No. 29, “Accounting for Nonmonetary Transactions,” to eliminate an exception under which certain exchanges of similar productive nonmonetary assets were not accounted for at fair value. SFAS No. 153 instead provides a general exception for exchanges of nonmonetary assets that do not have commercial substance. This statement must be applied to nonmonetary asset exchanges occurring in fiscal periods beginning after June 15, 2005. We do not anticipate that the adoption of SFAS No. 153 will have a material impact on our results of operations or financial position.

Critical Accounting Policies

      The discussion and analysis of our financial condition and results of operations are based on our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States. The preparation of these consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities known to exist at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. We evaluate our estimates on an ongoing basis, based on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. There can be no assurance that actual results will not differ from those estimates. Management has reviewed its development and selection of critical accounting estimates with the audit committee of our board of directors. We believe the following accounting policies affect our more significant judgments and estimates used in the preparation of our consolidated financial statements:

      Revenue Recognition. We recognize revenue when services are performed except when work is being performed under fixed price contracts. We record revenues from fixed price contracts on a percentage-of-completion basis, using the cost-to-cost method based on the percentage of total costs incurred to date in proportion to total estimated costs to complete the contract. Contract costs typically include all direct material, labor and subcontract costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and depreciation costs. Changes in job performance, job conditions, estimated profitability and final contract settlements may result in revisions to costs and income and their effects are recognized in the period in which the revisions are determined.

      Self-Insurance. We are insured for employer’s liability and general liability claims, subject to a deductible of $1,000,000 per occurrence, and for auto liability and workers’ compensation claims subject to a deductible of $2,000,000 per occurrence. We also have a non-union employee related health care benefit plan that is subject to a deductible of $250,000 per claimant per year. Losses up to the deductible amounts are accrued based upon our estimates of the ultimate undiscounted liability for claims incurred, an estimate of claims incurred but not reported and for future expected legal costs associated with the claims. However, insurance liabilities are difficult to assess and estimate due to unknown factors, including the severity of an injury, the determination of our liability in proportion to other parties, the number of incidents not reported and the effectiveness of our safety program. The accruals are based upon known facts and historical trends and management believes such accruals to be adequate.

      Our casualty insurance carrier for the policy periods from August 1, 2000 to February 28, 2003 is experiencing financial distress but is currently paying valid claims. In the event that this insurer’s financial situation further deteriorates, we may be required to pay certain obligations that otherwise would have been paid by this insurer. We estimate that the total future claim amount that this insurer is currently obligated to pay on our behalf for the above-mentioned policy periods is approximately $4.0 million, however, our estimate of the potential range of these future claim amounts is between $2.0 million and $9.0 million. The actual amounts ultimately paid by us related to these claims, if any, may vary materially from the above range and could be impacted by further claims development and the extent to which the insurer could not honor its obligations. In any event, we do not expect any failure by this insurer to honor its obligations to us to have a material adverse impact on our financial condition; however, the impact could be material to our results of

operations or cash flow in a given period. We continue to monitor the financial situation of this insurer and analyze any alternative actions that could be pursued.

      Valuation of Long-Lived Assets. SFAS No. 142 provides that goodwill and other intangible assets that have indefinite useful lives not be amortized, but instead must be tested at least annually for impairment, and intangible assets that have finite useful lives should continue to be amortized over their useful lives. SFAS No. 142 also provides specific guidance for testing goodwill and other unamortized intangible assets for impairment. SFAS No. 142 does not allow increases in the carrying value of reporting units that may result from our impairment test, therefore we may record goodwill impairments in the future, even when the aggregate fair value of our reporting units and the company as a whole may increase. Goodwill of a reporting unit shall be tested for impairment between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. Examples of such events or circumstances may include a significant change in business climate or a loss of key personnel, among others. SFAS No. 142 requires that management make certain estimates and assumptions in order to allocate goodwill to reporting units and to determine the fair value of reporting unit net assets and liabilities, including, among other things, an assessment of market conditions, projected cash flows, cost of capital and growth rates, which could significantly impact the reported value of goodwill and other intangible assets. Estimating future cash flows requires significant judgment and our projections may vary from cash flows eventually realized.

      We review long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount may not be realizable. If an evaluation is required, the estimated future undiscounted cash flows associated with the asset are compared to the asset’s carrying amount to determine if an impairment of such asset is necessary. Estimating future cash flows requires significant judgment and our projections may vary from cash flows eventually realized. The effect of any impairment would be to expense the difference between the fair value of such asset and its carrying value. In addition, we estimate the useful lives of our long-lived assets and other intangibles. We periodically review factors to determine whether these lives are appropriate. Net gains or losses from the sale of property and equipment are reflected in Selling, General and Administrative Expenses.

      Current and Non-Current Accounts and Notes Receivable and Provision for Doubtful Accounts. We provide an allowance for doubtful accounts when collection of an account or note receivable is considered doubtful. Inherent in the assessment of the allowance for doubtful accounts are certain judgments and estimates including, among others, our customer’s access to capital, our customer’s willingness or ability to pay, general economic conditions and the ongoing relationship with the customer. Certain of our customers, several of them large public telecommunications carriers and utility customers, have been experiencing financial difficulties. Should any major customers file for bankruptcy or continue to experience difficulties, or should anticipated recoveries relating to the receivables in existing bankruptcies and other workout situations fail to materialize, we could experience reduced cash flows and losses in excess of current reserves. In addition, material changes in our customers’ revenues or cash flows could affect our ability to collect amounts due from them.

      Stock Based Compensation. Through December 31, 2004, we accounted for our stock option awards under Accounting Principles Board Opinion No. 25 (APB Opinion No. 25), “Accounting for Stock Issued to Employees.” Under this accounting method, no compensation expense is recognized in the consolidated statements of operations if no intrinsic value of the option exists at the date of grant. In December 2004, the FASB issued SFAS No. 123R as previously discussed, requiring companies to account for stock-based compensation awards based on the fair value of the awards at the date they are granted. The resulting compensation costs would be shown as an expense in the consolidated statements of operations. SFAS No. 123R is effective beginning in the third quarter of 2005. Until effective, disclosure is required as to what net income and earnings per share would have been had the new accounting method been followed for our stock option awards under our 2001 Stock Incentive Plan and stock issued pursuant to our ESPP. The expense recognition for restricted stock awards are the same under APB Opinion No. 25 and SFAS No. 123R, with expense being recognized in the financial statements. See Note 2 of the Notes to Consolidated Financial Statements for such disclosure.

      Income Taxes. We follow the liability method of accounting for income taxes in accordance with SFAS No. 109, “Accounting for Income Taxes.” Under this method, deferred assets and liabilities are recorded for future tax consequences of temporary differences between the financial reporting and tax bases of assets and liabilities, and are measured using the enacted tax rates and laws that will be in effect when the underlying assets or liabilities are recovered or settled.

      We regularly evaluate valuation allowances established for deferred tax assets for which future realization is uncertain and we maintain an allowance for tax contingencies, which we believe is adequate. The estimation of required valuation allowances includes estimates of future taxable income. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. We consider projected future taxable income and tax planning strategies in making this assessment. If actual future taxable income differs from our estimates, we may not realize deferred tax assets to the extent we have estimated.

Outlook

      The following statements are based on current expectations. These statements are forward looking, and actual results may differ materially.

      Like many companies that provide installation and maintenance services to the electric power, gas, telecommunications and cable television industries, we have faced a number of challenges. Our markets experienced substantial change during 2002 and 2003 as evidenced by an increased number of bankruptcies in the telecommunications market, continued devaluation of many of our customers’ debt and equity securities and pricing pressures resulting from challenges faced by major industry participants. These factors have contributed to the delay of projects and reduction of capital spending that have impacted our operations and ability to grow at historical levels.

      We believe the historic downturn of the telecommunications industry has reached bottom and that the industry has stabilized. Further, there are several telecommunications initiatives currently in discussion and underway by several wireline carriers and government organizations that could provide us with pockets of opportunity in the future, particularly from fiber to the premises (FTTP) and fiber to the node (FTTN) initiatives. Such initiatives have been announced by Verizon and SBC, and municipalities have also become active in FTTP initiatives.

      Our wireless customers continued to be impacted by mergers within their industry in the second half of 2004. As these mergers are completed, spending on wireless networks should gradually resume. In addition, several wireless companies have announced plans to increase their cell site deployment plans over the next year.

      Utilities across the country are regaining their financial health and are making plans to increase spending on their transmission and distribution systems. As a result, we anticipate more extensive pole change outs, line upgrades and maintenance projects on many systems over the next several quarters. Further, we anticipate that a comprehensive energy bill could be passed that could clarify regulatory uncertainties and provide proper incentives for the power industry to invest in and improve maintenance on their transmission and distribution systems.

      Spending in the cable television industry remains flat. However, with several telecom companies increasing the pace of their FTTP and FTTN projects that will enable them to offer TV services via fiber to their customers, such initiatives could serve as a catalyst for the cable industry to begin a new network upgrade cycle to expand its service offerings in an effort to retain and attract customers.

      We have seen spending levels improve in most of the industries we serve with each quarter of 2004 . With the stabilization of several of our markets, we have begun to see gross margins generally stabilize as well. While operating conditions are still abnormal and many challenges remain, we are also beginning to see some opportunity for margins to improve, but they are not expected to return to historical levels in the near term. To the extent that our primary markets remain stable or begin to improve, margins could gradually continue to improve.

      Our backlog at December 31, 2003 and 2004 was approximately $1.01 billion and $1.07 billion. Backlog represents the amount of revenue that we expect to realize from work to be performed over the next twelve months on uncompleted contracts, including new contractual agreements on which work has not begun. In many instances, our customers are not contractually committed to specific volumes of services under our long-term maintenance contracts and many of our contracts may be terminated with notice. There can be no assurance as to our customer’s requirements or that our estimates are accurate.

      We continue to focus on the elements of the business we can control, including cost control, the margins we accept on projects, collecting receivables, ensuring quality service and right sizing initiatives to match the markets we serve. These initiatives include aligning our work force with our current revenue base, evaluating opportunities to reduce the number of field offices and evaluating our non-core assets for potential sale. Such initiatives could result in future charges related to, among others, severance, facilities shutdown and consolidation, property disposal and other exit costs.

      Capital expenditures in 2005 are expected to be approximately $40.0 million to $50.0 million. A majority of the expenditures will be for operating equipment. We expect expenditures for 2005 to be funded substantially through internal cash flows and, to the extent necessary, from cash on hand.

      We believe that we are adequately positioned to capitalize upon opportunities in the industries we serve because of our proven full-service operating units with broad geographic reach, financial capability and technical expertise.

Uncertainty of Forward-Looking Statements and Information

      This Annual Report on Form 10-K includes statements reflecting assumptions, expectations, projections, intentions or beliefs about future events that are intended as “forward-looking statements” under the Private Securities Litigation Reform Act of 1995. You can identify these statements by the fact that they do not relate strictly to historical or current facts. They use words such as “anticipate,” “estimate,” “project,” “forecast,” “may,” “will,” “should,” “could,” “expect,” “believe” and other words of similar meaning. In particular, these include, but are not limited to, statements relating to the following:

      Any or all of our forward-looking statements may turn out to be wrong. They can be affected by inaccurate assumptions and by known or unknown risks and uncertainties, including the following:

      Many of these factors will be important in determining our actual future results. Consequently, no forward-looking statement can be guaranteed. Our actual future results may vary materially from those expressed or implied in any forward-looking statements.

      All of our forward-looking statements, whether written or oral, are expressly qualified by these cautionary statements and any other cautionary statements that may accompany such forward-looking statements. In addition, we disclaim any obligation to update any forward-looking statements to reflect events or circumstances after the date of this report.

      We are exposed to market risk related to potential adverse changes in interest rates. Management does not generally use derivative financial instruments for trading or to speculate on changes in interest rates or commodity prices. Management is actively involved in monitoring exposure to market risk and continues to develop and utilize appropriate risk management techniques. We are not exposed to any other significant market risks, foreign currency exchange risk or interest rate risk from the use of derivative financial instruments.

      The sensitivity analyses below, which illustrate our hypothetical potential market risk exposure, estimate the effects of hypothetical sudden and sustained changes in the applicable market conditions on 2004 earnings. The sensitivity analyses presented do not consider any additional actions we may take to mitigate our exposure to such changes. The hypothetical changes and assumptions may be different from what actually occurs in the future.

      Interest Rates. As of December 31, 2004, we had no derivative financial instruments to manage interest rate risk. As such, we are exposed to earnings and fair value risk due to changes in interest rates with respect to our long-term obligations. As of December 31, 2003 and 2004, the fair value of our fixed-rate debt of

$449.6 million and $449.8 million was approximately $449.2 million and $469.3 million, based upon current market prices. As of December 31, 2003, the fair value of our variable rate debt of $56.0 million approximated book value and the detrimental effect on our pretax earnings of a hypothetical 50 basis point increase in variable interest rates would be approximately $0.3 million. As of December 31, 2004, the fair value of our variable rate debt of $20.8 million approximated book value and the detrimental effect on our pretax earnings of a hypothetical 50 basis point increase in variable interest rates would be approximately $0.1 million.

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

REPORT OF MANAGEMENT

Management’s Report on Financial Information and Procedures

      The accompanying financial statements of Quanta Services, Inc. and its subsidiaries were prepared by management. These financial statements were prepared in accordance with accounting principles generally accepted in the United States, applying certain estimates and judgments as required.

      Our management, including the Chief Executive Officer and Chief Financial Officer, does not expect that our disclosure controls or our internal control over financial reporting will prevent or detect all errors and all fraud. A control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that the control system’s objectives will be met. The design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Further, because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that misstatements due to error or fraud will not occur or that all control issues and instances of fraud, if any, within the company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty and that breakdowns can occur because of simple errors or mistakes. Controls can also be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the controls. The design of any system of controls is based in part on certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. Over time, controls may become inadequate because of changes in conditions or deterioration in the degree of compliance with policies or procedures.

Management’s Report on Internal Control Over Financial Reporting

     Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Our internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of our consolidated financial statements for external purposes in accordance with U.S. generally accepted accounting principles.

      Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we have conducted an evaluation of the effectiveness of our internal control over financial reporting based upon the criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, our management has concluded that our internal control over financial reporting was effective as of December 31, 2004.

      Because of its inherent limitations, a system of internal control over financial reporting can provide only reasonable assurances and may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with policies and procedures may deteriorate.

      Management’s assessment of the effectiveness of our internal control over financial reporting as of December 31, 2004 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report, which appears on the following page.

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders

Quanta Services, Inc.

      We have completed an integrated audit of Quanta Services, Inc.’s 2004 consolidated financial statements and of its internal control over financial reporting as of December 31, 2004 and audits of its 2003 and 2002 consolidated financial statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). Our opinions, based on our audits, are presented below.

Consolidated financial statements

      In our opinion, the consolidated financial statements listed in the accompanying index, present fairly, in all material respects, the financial position of Quanta Services, Inc. and its subsidiaries at December 31, 2004 and 2003, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2004 in conformity with accounting principles generally accepted in the United States of America. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits of these statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit of financial statements includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

      As discussed in Note 2 to the consolidated financial statements, in 2002, the Company changed its method of accounting for goodwill as a result of adopting the provisions of Statement of Financial Accounting Standards No. 142, “Goodwill and other Intangible Assets.”

Internal control over financial reporting

      Also, in our opinion, management’s assessment, included in Management’s Report on Internal Control over Financial Reporting, which appears on the preceding page, that the Company maintained effective internal control over financial reporting as of December 31, 2004 based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO), is fairly stated, in all material respects, based on those criteria. Furthermore, in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2004, based on criteria established in Internal Control — Integrated Framework issued by COSO. The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting. Our responsibility is to express opinions on management’s assessment and on the effectiveness of the Company’s internal control over financial reporting based on our audit. We conducted our audit of internal control over financial reporting in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. An audit of internal control over financial reporting includes obtaining an understanding of internal control over financial reporting, evaluating management’s assessment, testing and evaluating the design and operating effectiveness of internal control, and performing such other procedures as we consider necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinions.

      A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial

statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

      Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

PricewaterhouseCoopers LLP

Houston, Texas

March 15, 2005

QUANTA SERVICES, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(In thousands, except share information)

The accompanying notes are an integral part of these consolidated financial statements.

QUANTA SERVICES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except share information)

The accompanying notes are an integral part of these consolidated financial statements.

QUANTA SERVICES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

The accompanying notes are an integral part of these consolidated financial statements.

QUANTA SERVICES, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(In thousands, except share information)