Exhibit 99.1

		PRESS RELEASE

FOR IMMEDIATE RELEASE

06-20

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

QUANTA SERVICES REPORTS THIRD QUARTER RESULTS
Net Income up 74%
EPS Increased from $0.11 to $0.17

HOUSTON — November 2, 2006 — Quanta Services, Inc. (NYSE:PWR) today announced results for the three and nine months ended September 30, 2006.

     Revenues in the third quarter of 2006 were $528.5 million compared to revenues of $523.3 million in the third quarter of 2005. For the third quarter of 2006, net income was $22.4 million or $0.17 per diluted share, compared to net income of $12.9 million or $0.11 per diluted share for the third quarter of 2005.

     Revenues for the first nine months of 2006 were $1.54 billion compared to $1.34 billion for the first nine months of 2005. For the first nine months of 2006, the company reported net income of $47.9 million or $0.38 per diluted share, compared to net income of $11.1 million or $0.10 per diluted share for the first nine months of last year.

     “Our ability to increase net income, strengthen margins and achieve internal revenue growth in a quarter that had approximately $60 million less revenues from storm work than in the third quarter of 2005 illustrates the strength of the market and Quanta’s ability to respond,” said John R. Colson, chairman and chief executive officer of Quanta Services. “Utilities and telecommunications companies continue to rely on Quanta to provide superior service, strong safety performance and timely delivery. This reliance is reflected in our 15 percent increase in year over year backlog and, excluding storm work, double-digit internal revenue growth.”

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RECENT HIGHLIGHTS —

•		Secured Contract with Northeast Utilities — Quanta secured the largest electric utility transmission contract in its history. Under the contract, Quanta will provide transmission infrastructure services spanning approximately 45 miles of the utility’s New England system. Upon completion, this new transmission line will help improve reliability of the region’s power supply and provide benefits to customers in the state of Connecticut and those in New England.
•		Held the Fourth Annual Utility Perspectives Symposium — Quanta’s fourth annual Utility Perspectives Symposium attracted a record number of utility leaders to San Francisco to discuss industry issues. The invitation-only event assembled select senior executives representing utilities from across the United States and Canada as well as industry leaders and experts to engage in high-level discussions on topics ranging from navigating the new financial landscape to new technologies and regulatory developments.

OUTLOOK

     The following statements are based on current expectations. These statements are forward-looking, and actual results may differ materially. These statements do not include the potential impact of any business combinations or divestitures that may be completed after September 30, 2006.

     Quanta expects revenues for the fourth quarter of 2006 to range between $500 million and $525 million and diluted earnings per share to be between $0.11 and $0.14. These estimates do not include the potential impact of any significant storm restoration revenues for the fourth quarter of 2006. In the fourth quarter of 2005, gross storm restoration revenues were approximately $70 million.

     Quanta Services has scheduled a conference call for November 2, 2006, at 9:30 a.m. eastern time. To participate in the call, dial 303-262-2140 at least 10 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.

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     For those who cannot listen to the live web cast, an archive will be available shortly after the call on the company’s website. A replay will also be available and may be accessed by calling 303-590-3000 and using the pass code 11066692. For more information, please contact Karen Roan at DRG&E by calling (713) 529-6600.

     Quanta Services, Inc. is a leading provider of specialized contracting services, delivering end-to-end network solutions for the electric power, gas, telecommunications and cable television industries. The company’s comprehensive services include designing, installing, repairing and maintaining network infrastructure nationwide.

This press release 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, statements relating to projected revenues and earnings per share and other financial and operating results, capital expenditures, growth in particular markets, benefits of the Energy Policy Act of 2005, strategies, expectations, intentions, plans, future events, performance, underlying assumptions, 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 have been correct. These statements can be affected by inaccurate assumptions and by a variety of risks and uncertainties, including, among others, quarterly variations in operating results; adverse changes in economic conditions in relevant markets; the ability to effectively compete for market share; estimates and assumptions in determining financial results; beliefs and assumptions about the collectibility of receivables; the inability of customers to pay for services; the financial distress of Quanta’s casualty insurance carrier that may require payment for losses that would otherwise be insured; liabilities for claims that are self-insured or for claims that Quanta’s casualty insurance carrier fails to pay; potential liabilities relating to occupational health and safety matters; estimates relating to the use of percentage-of-completion accounting; dependence on fixed price contracts; rapid technological and structural changes that could reduce the demand for services; the ability to obtain performance bonds; cancellation provisions within contracts and the risk that contracts are not renewed or are replaced on less favorable terms; the ability to effectively integrate the operations of acquired businesses; retention of key personnel and qualified employees; the impact of a unionized workforce on operations and the ability to complete future acquisitions; potential shortage of skilled employees; growth outpacing infrastructure; risks associated with operating in international markets; potential exposure to environmental liabilities; requirements relating to governmental regulation; the ability to continue to meet the requirements of the Sarbanes-Oxley Act of 2002; the cost of borrowing, availability of credit, debt covenant compliance and other factors affecting financing activities; the ability to generate internal growth; the ability to successfully identify and complete acquisitions; the adverse impact of goodwill impairments; the potential conversion of outstanding convertible subordinated notes; and other risks detailed in Quanta’s Annual Report on Form 10-K for the year ended December 31, 2005, Quanta’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2006 and June 30, 2006, and any other reports of the company filed with the Securities and Exchange Commission. 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 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 reports filed with the Securities and Exchange Commission.

- Tables to follow -

		Quanta Services, Inc. and Subsidiaries Consolidated Statements of Operations For the Three and Nine Months Ended September 30, 2006 and 2005 (In thousands, except per share information) (Unaudited)

		Three Months Ended								Nine Months Ended
		September 30,								September 30,
		2006				2005				2006				2005
Revenues		$	528,468			$	523,340			$	1,539,010			$	1,335,132
Cost of services			445,332				443,167				1,316,071				1,165,051
Gross profit			83,136				80,173				222,939				170,081
Selling, general & administrative expenses			45,103				49,420				134,018				135,756
Income from operations			38,033				30,753				88,921				34,325
Interest expense			(5,736	)			(6,041	)			(21,414	)			(17,963	)
Interest income			4,297				1,921				10,312				5,136
Gain on early extinguishment of debt			—				—				1,598				—
Other, net			59				62				387				324
Income before taxes			36,653				26,695				79,804				21,822
Provision for taxes			14,230				13,815				31,863				10,727
Net income		$	22,423			$	12,880			$	47,941			$	11,095
Earnings per share:
Basic		$	0.19			$	0.11			$	0.41			$	0.10
Diluted		$	0.17	(a)		$	0.11	(b)		$	0.38	(b)		$	0.10
Shares used in computing earnings per share:
Basic			117,202				115,970				116,959				115,640
Diluted			148,534	(a)			141,177	(b)			141,939	(b)			116,382

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

		September 30,				December 31,
		2006				2005
ASSETS
CURRENT ASSETS:
Cash and short-term investments		$	351,715			$	304,267
Accounts receivable, net			456,938				431,584
Costs and estimated earnings in excess of billings on uncompleted contracts			48,961				38,053
Inventories			27,209				25,717
Prepaid expenses and other current assets			31,255				31,389
Total current assets			916,078				831,010
PROPERTY AND EQUIPMENT, net			279,023				286,606
ACCOUNTS AND NOTES RECEIVABLE, net			10,019				15,229
OTHER ASSETS, net			33,146				33,583
GOODWILL AND OTHER INTANGIBLES, net			388,160				388,357
Total assets		$	1,626,426			$	1,554,785
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES:
Current maturities of long-term debt		$	35,250			$	2,252
Accounts payable and accrued expenses			247,940				241,811
Billings in excess of costs and estimated earnings on uncompleted contracts			15,788				14,008
Total current liabilities			298,978				258,071
LONG-TERM DEBT, net of current maturities			—				7,591
CONVERTIBLE SUBORDINATED NOTES			413,750				442,500
DEFERRED INCOME TAXES AND OTHER NON-CURRENT LIABILITIES			155,147				142,885
Total liabilities			867,875				851,047
STOCKHOLDERS’ EQUITY			758,551				703,738
Total liabilities and stockholders’ equity		$	1,626,426			$	1,554,785

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