Exhibit 99.1

		PRESS RELEASE

FOR IMMEDIATE RELEASE

09-11

Contacts:		James Haddox, CFO		Ken Dennard / ksdennard@drg-e.com
		Reba Reid		Kip Rupp / krupp@drg-e.com
		Quanta Services Inc.		DRG&E
		713-629-7600		713-529-6600

QUANTA SERVICES REPORTS 2009 SECOND QUARTER RESULTS
Gross Margins Continued to Improve
Diluted EPS of $0.17
Adjusted Diluted EPS of $0.20

HOUSTON – Aug. 5, 2009 – Quanta Services, Inc. (NYSE: PWR) today announced results for the three and six months ended June 30, 2009.

          Revenues in the second quarter of 2009 were $813.4 million compared to revenues of $960.9 million in the second quarter of 2008. For the second quarter of 2009, net income attributable to common stock was $33.4 million or $0.17 per diluted share as compared to $37.7 million or $0.21 per diluted share in the second quarter of 2008. Adjusted diluted earnings per share (a non-GAAP measure) was $0.20 for the second quarter of 2009 as compared to $0.26 for the second quarter of 2008. Adjusted diluted earnings per share is GAAP earnings per diluted share before amortization of intangible assets, non-cash interest expense and non-cash compensation expense, all net of tax. See the attached table for a reconciliation of non-GAAP measures to the reported GAAP measures.

     “Despite an environment of economic turmoil, with customers awaiting government funding and most of the country still struggling with uncertainty, our market outlook shows improvement for the second half of this year,” said John R. Colson, chairman and CEO. “Our focus on effectively maintaining margins during the current economic environment should position us well as spending by our customers returns. We continue to receive indications from our customers that 2010 and 2011 will reflect further strengthening in our end markets.”

     Revenues for the first six months of 2009 were $1.55 billion compared to $1.81 billion for the first half of 2008. For the first six months of 2009, Quanta reported net income attributable to common stock of $54.8 million or $0.28 per diluted share, compared to $59.1 million or $0.34 per diluted share for the first six

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months of last year. Adjusted diluted earnings per share was $0.34 for the first six months of 2009 as compared to $0.44 for the first six months of 2008. See the attached table for a reconciliation of non-GAAP measures to the reported GAAP measures.

          See Note (a) to the attached Consolidated Statements of Operations for an explanation of 2008 amounts that have been retrospectively restated as a result of the adoption of new accounting pronouncements effective Jan. 1, 2009.

OUTLOOK

          Quanta recognizes that it and its customers continue to operate in a challenging business environment with the economic downturn and weak capital markets. Therefore, management cannot predict the timing or extent of the impact these conditions may have on demand for Quanta’s services, particularly in the near term. The following forward-looking statements are based on current expectations and actual results may differ materially.

          Quanta expects revenues for the third quarter of 2009 to range between $840 million and $870 million. This estimate includes a forecast of emergency restoration service revenues of $21 million versus approximately $114.7 million in emergency restoration service revenues being earned in the third quarter of 2008. Diluted earnings per share for the third quarter of 2009 are estimated to be between $0.20 and $0.21. Quanta expects adjusted diluted earnings per share (a non-GAAP measure calculated on the same basis as the historical adjusted earnings per diluted share presented in this release) for the third quarter of 2009 to range from $0.23 to $0.24. Amortization of intangibles, non-cash interest expense and non-cash stock compensation expenses are forecasted to be approximately $11.2 million for the third quarter of 2009.

          Quanta Services has scheduled a conference call for Aug. 5, 2009, at 9:30 a.m. Eastern time. To participate in the call, dial (480) 629-9642 at least ten minutes before the conference call begins and ask for the Quanta Services conference call. Investors, analysts and the general public also will have the opportunity to listen to the conference call over the Internet by visiting the company’s Web site at www.quantaservices.com. To listen to the call live on the Web, please visit the Quanta Services Web site at least fifteen minutes early to register, download and install any necessary audio software. For those who cannot listen to the live webcast, an archive will be available shortly after the call on the company’s Web site at www.quantaservices.com. A replay will also be available through Aug. 12, 2009, and may be accessed at (303) 590-3030 and using the pass code 4125867#. For more information, please contact Karen Roan at DRG&E by calling (713) 529-6600 or email kcroan@drg-e.com.

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          The non-GAAP measures in this press release and the attached table are provided to enable investors to evaluate performance excluding the effects of certain items that management believes impact the comparability of operating results between reporting periods. Reconciliations of other GAAP to non-GAAP measures not included in this press release and certain other items to be discussed during the conference call can be found on the company’s Web site at www.quantaservices.com in the “Financial News” section.

          Quanta Services is a leading specialized contracting services company, delivering infrastructure network solutions for the electric power, natural gas, telecommunications and cable television industries. The company’s comprehensive services include designing, installing, repairing and maintaining network infrastructure nationwide. Additionally, Quanta licenses point-to-point fiber optic telecommunications infrastructure in select markets and offers related design, procurement, construction and maintenance services. With operations throughout North America, Quanta has the manpower, resources and expertise to complete projects that are local, regional, national or international in scope.

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Forward-Looking Statements

This press release (and oral statements regarding the subject matter of this release, including those made on the conference call and webcast announced herein) contains forward-looking statements intended to qualify for the “safe harbor” from liability established by the Private Securities Litigation Reform Act of 1995.  Forward-looking statements include, but are not limited to, projected revenues and earnings per share and other projections of financial and operating results and capital expenditures; growth or opportunities in particular markets; the impact of the Energy Policy Act of 2005, renewable energy initiatives, the recently enacted economic stimulus package and other potential legislative actions on future spending by customers; the expected value of, and the scope, services, term and results of any related projects awarded under, agreements for services to be provided by Quanta; statements relating to the business plans or financial condition of utilities and our other customers; and Quanta’s strategies and plans, as well as statements reflecting expectations, intentions, assumptions or beliefs about future events, and other statements that do not relate strictly to historical or current facts.  Although Quanta’s management believes that the expectations reflected in such forward-looking statements are reasonable, it can give no assurance that such expectations will prove to be correct.  These statements can be affected by inaccurate assumptions and by a variety of risks and uncertainties that are difficult to predict or beyond our control, including, among others, quarterly variations in operating results; continuing declines in economic and financial conditions, including volatility in the capital markets; trends in relevant markets; delays, reductions in scope or cancellations of existing projects, including as a result of capital constraints that may impact our customers; dependence on fixed price contracts and the potential to incur losses with respect to these contracts; estimates relating to the use of percentage-of-completion accounting; the successful negotiation, execution, performance and completion of pending and existing contracts; the ability to generate internal growth; the ability to effectively compete for new projects and market share; the failure of the Energy Policy Act of 2005, renewable energy initiatives, the recently enacted economic stimulus package or other potential legislative actions to result in increased demand for Quanta’s services; cancellation provisions within contracts and the risk that contracts are not renewed or are replaced on less favorable terms; the inability of customers to pay for services; the failure to recover on payment claims against project owners or to obtain adequate compensation for customer-requested change orders; the ability to attract skilled labor and retain key personnel and qualified employees; potential shortage of skilled employees; estimates and assumptions in determining financial results and backlog; the ability to realize backlog; the ability to successfully identify, complete and integrate acquisitions; the adverse impact of goodwill or other intangible asset impairments; growth outpacing infrastructure; unexpected costs or liabilities that may arise from lawsuits or indemnity claims related to the services Quanta performs; liabilities for claims that are self-insured; risks associated with the implementation of an information technology solution; potential liabilities relating to occupational health and safety matters; the potential that participation in joint ventures exposes us to liability and/or harm to our reputation for failures of our partners; risks associated with operating in international markets; risks associated with our dependence on suppliers, subcontractors and equipment manufacturers; risks associated with Quanta’s dark fiber licensing business, including regulatory changes and the potential inability to realize a return on capital investments; beliefs and assumptions about the collectability of receivables; the cost of borrowing, availability of credit, fluctuations in the price and volume of Quanta’s common stock, debt covenant compliance, interest rate fluctuations and other factors affecting financing and investment activities; the ability to obtain performance bonds; the impact of a unionized workforce on operations and the ability to complete future acquisitions; the ability to continue to meet the requirements of the Sarbanes-Oxley Act of 2002; potential exposure to environmental liabilities; requirements relating to governmental regulation and changes thereto; rapid technological and structural changes that could reduce the demand for services; the ability to access sufficient funding to finance desired growth and operations; the potential conversion of Quanta’s outstanding convertible subordinated notes; provisions of our corporate governing documents could make an acquisition of our company more difficult; and other risks detailed in Quanta’s Annual Report on Form 10-K for the year ended December 31, 2008, Quanta’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2009, and any other documents that Quanta files with the Securities and Exchange Commission (SEC).  Should one or more of these risks materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those expressed or implied in any forward-looking statements. You are cautioned not to place undue reliance on these forward-looking statements, which are current only as of this date. Quanta does not undertake and expressly disclaims any obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. For a discussion of these risks, uncertainties and assumptions, investors are urged to refer to Quanta’s documents filed with the SEC that are available through the company’s Web site at www.quantaservices.com or through the SEC’s Electronic Data Gathering and Analysis Retrieval System (EDGAR) at www.sec.gov.

- Tables to follow -

		Quanta Services, Inc. and Subsidiaries Consolidated Statements of Operations For the Three and Six Months Ended June 30, 2009 and 2008 (In thousands, except per share information) (Unaudited)

		Three Months Ended June 30,								Six Months Ended June 30,
		2009				2008				2009				2008
						Restated(a)								Restated(a)
Revenues		$	813,379			$	960,882			$	1,551,909			$	1,805,324
Cost of services (including depreciation)			675,597				802,192				1,296,996				1,522,757
Gross profit			137,782				158,690				254,913				282,567
Selling, general & administrative expenses			72,970				76,292				146,573				147,008
Amortization of intangible assets			4,906				9,876				9,812				20,466
Operating income			59,906				72,522				98,528				115,093
Interest expense			(2,803	)			(9,722	)			(5,621	)			(19,316	)
Interest income			628				2,088				1,709				6,083
Other income (expense), net			158				278				234				482
Income before income taxes			57,889				65,166				94,850				102,342
Provision for income taxes			24,245				27,498				39,716				43,203
Net income			33,644				37,668				55,134				59,139
Less: Net income attributable to noncontrolling interest			217				—				353				—
Net income attributable to common stock		$	33,427			$	37,668			$	54,781			$	59,139
Earnings per share attributable to common stock:
Basic earnings per share		$	0.17			$	0.22			$	0.28			$	0.34
Diluted earnings per share		$	0.17			$	0.21			$	0.28			$	0.34
Weighted average shares used in computing earnings per share:
Basic			198,300				172,393				198,365				171,681
Diluted			198,379				197,021				198,431				172,112

		Quanta Services, Inc. and Subsidiaries Calculation of Earnings Per Share For the Three and Six Months Ended June 30, 2009 and 2008 (In thousands, except per share information) (Unaudited)

		Three Months Ended								Six Months Ended
		June 30,								June 30,
		2009				2008				2009				2008
						Restated(a)								Restated(a)
Income for diluted earnings per share:
Net income attributable to common stock		$	33,427			$	37,668			$	54,781			$	59,139
Effect of convertible notes under the “if-converted” method — interest expense addback, net of taxes			—				4,532				—				—
Net income attributable to common stock for diluted earnings per share		$	33,427			$	42,200			$	54,781			$	59,139
Calculation of weighted average shares for diluted earnings per share:
Weighted average shares outstanding for basic earnings per share			198,300				172,393				198,365				171,681
Effect of dilutive stock options			79				393				66				431
Effect of convertible subordinated notes under the “if-converted” method — weighted convertible shares issuable			—				24,235				—				—
Weighted average shares outstanding for diluted earnings per share			198,379				197,021				198,431				172,112
Diluted earnings per share:
Net income attributable to common stock		$	0.17			$	0.21			$	0.28			$	0.34

		Quanta Services, Inc. and Subsidiaries Non-GAAP Financial Measures For the Three and Six Months Ended June 30, 2009 and 2008 (In thousands, except per share information) (Unaudited)

Reconciliation of GAAP Earnings per Diluted Share to
Adjusted Diluted Earnings per Share

		Three Months Ended								Six Months Ended
		June 30,								June 30,
		2009				2008				2009				2008
						Restated(a)								Restated(a)
Adjusted net income attributable to common stock for adjusted diluted earnings per share:
Net income attributable to common stock (GAAP as reported)		$	33,427			$	37,668			$	54,781			$	59,139
Non-cash stock-based compensation, net of tax			3,028				2,796				5,896				5,099
Non-cash interest expense, net of tax(a)			697				3,003				1,381				5,935
Amortization of intangible assets, net of tax			2,993				6,024				5,986				12,484
Adjusted net income attributable to common stock		$	40,145			$	49,491			$	68,044			$	82,657
Effect of convertible subordinated notes under the “if-converted” method — interest expense addback, net of tax			948				3,122				1,897				6,245
Adjusted net income attributable to common stock for adjusted diluted earnings per share		$	41,093			$	52,613			$	69,941			$	88,902
Calculation of weighted average shares for adjusted diluted earnings per share:
Weighted average shares outstanding for basic earnings per share			198,300				172,393				198,365				171,681
Effect of dilutive stock options			79				393				66				431
Effect of convertible subordinated notes under the “if converted” method — weighted convertible shares issuable			6,415				30,650				6,415				30,650
Weighted average shares outstanding for adjusted diluted earnings per share			204,794				203,436				204,846				202,762
Adjusted diluted earnings per share		$	0.20			$	0.26			$	0.34			$	0.44

The non-GAAP measures in this press release are provided to enable investors to evaluate quarterly performance excluding the effects of items that management believes impact the comparability of operating results between periods. More particularly, (i) amortization of intangible assets is impacted by Quanta’s acquisition activity which can cause the amortization expense to vary period-to-period; (ii) non-cash interest expense results from the requirements of FSP APB 14-1 (see Note (a) to the Consolidated Statements of Operations) and varies from period-to-period depending on the amount of the convertible subordinated notes outstanding during the period, and (iii) non-cash compensation expense may vary due to acquisition activity and factors influencing the estimated fair value of performance based awards.

		Quanta Services, Inc. and Subsidiaries Condensed Consolidated Balance Sheets (In thousands) (Unaudited)

		June 30,				December 31,
		2009				2008
						Restated(a)
ASSETS
CURRENT ASSETS:
Cash and cash equivalents		$	524,356			$	437,901
Accounts receivable, net			723,711				795,251
Costs and estimated earnings in excess of billings on uncompleted contracts			49,007				54,379
Inventories			27,967				25,813
Prepaid expenses and other current assets			60,851				68,147
Total current assets			1,385,892				1,381,491
PROPERTY AND EQUIPMENT, net			677,346				635,456
OTHER ASSETS, net			42,159				33,479
OTHER INTANGIBLE ASSETS, net			130,905				140,717
GOODWILL			1,363,200				1,363,100
Total assets		$	3,599,502			$	3,554,243
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Current maturities of long-term debt and notes payable		$	2			$	1,155
Accounts payable and accrued expenses			364,514				400,253
Billings in excess of costs and estimated earnings on uncompleted contracts			66,206				50,390
Total current liabilities			430,722				451,798
CONVERTIBLE SUBORDINATED NOTES, NET			124,400				122,275
DEFERRED INCOME TAXES AND OTHER NON-CURRENT LIABILITIES			310,902				308,955
Total liabilities			866,024				883,028
TOTAL STOCKHOLDERS’ EQUITY			2,733,125				2,671,215
NONCONTROLLING INTEREST			353				—
TOTAL EQUITY			2,733,478				2,671,215
Total liabilities and equity		$	3,599,502			$	3,554,243

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