EXHIBIT 99.1

		PRESS RELEASE

FOR IMMEDIATE RELEASE

05-15

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

HOUSTON — November 4, 2005 — Quanta Services, Inc. (NYSE:PWR) today announced results for the three and nine months ended September 30, 2005.

     Revenues in the third quarter of 2005 were $523.3 million, compared to revenues of $463.1 million in the third quarter of 2004. For the third quarter of 2005, net income was $12.9 million, or earnings per diluted share of $0.11, compared to net income of $4.2 million, or earnings per diluted share of $0.04 in last year’s third quarter.

     Revenues for the first nine months of 2005 were $1.34 billion, compared to $1.21 billion for the first nine months of 2004. For the first nine months of 2005, the company reported net income of $11.1 million, or earnings per diluted share of $0.10, compared to a net loss of $11.0 million, or a loss per diluted share of $0.10 in the first nine months of last year.

     “Our third quarter results show improved spending in the industries we serve and reflect significant infrastructure restoration work performed after major hurricanes struck the Gulf Coast Region,” said John R. Colson, chairman and chief executive officer of Quanta Services. “Excluding storm-related revenues in the third quarters of 2004 and 2005, revenues increased by 14 percent in the third quarter of 2005. Backlog increased 19 percent over the same period.”

          — more —

RECENT HIGHLIGHTS

•		Supported Utilities in Restoration Efforts — During the third quarter, Quanta deployed more than 2,000 line personnel to the Gulf Coast Region to assist utilities in restoring power and communications to the areas affected by Hurricanes Dennis, Katrina and Rita. Approximately half of those crews remain in the region to help utilities repair and rebuild their power delivery infrastructures.
•		CEO Recognized by Industry Association — John R. Colson was inducted into The Academy of Electrical Contracting at a recent ceremony in Chicago. The Academy was established by the National Electrical Contractors Association (NECA) to recognize exceptional and outstanding service to the electrical contracting industry. Separately, Mr. Colson was elected to serve as Vice President-at-Large of NECA. He will serve a two-year term starting January 1, 2006.
•		Held Third Annual Utility Perspectives Symposium — Quanta hosted its third annual Utility Perspectives Symposium in Las Vegas during the quarter. The meeting brought together select industry executives, leaders and experts to engage in high-level discussions on topics ranging from regulatory uncertainty and financial pressures to grid disruption and security. This invitation-only event included select senior executives representing utilities from across the United States and Canada.
•		Became Member of Corning Total Access ProgramSM (TAP) — During the third quarter, Quanta became one of a few members of Corning Cable Systems’ TAP. Membership in the program enables our customers to receive up to a 10-year extended product warranty from Corning on complete Corning fiber-to-the-home (FTTH) solutions, when installed by Quanta.

OUTLOOK

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

     Quanta expects revenues for the fourth quarter of 2005 to range from $450 million to $480 million. Earnings for the fourth quarter are expected to range from $0.06 per diluted share to $0.08 per diluted share.

— more —

     Quanta Services has scheduled a conference call for Friday, November 4, 2005, at 9:30 A.M. eastern time. To participate in the call, dial (303) 262-2193 at least ten minutes before the call begins and ask for the Quanta Services conference call. Investors, analysts and the general public will also have the opportunity to listen to the conference call over the Internet by visiting the company’s website 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 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 11042851. For more information, please contact Karen Roan at DRG&E at 713-529-6600 or email
kcroan@drg-e.com.

     Quanta Services, Inc. is a leading provider of specialized contracting services, delivering end-to-end network solutions for 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, 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 due to seasonality and adverse weather conditions; adverse changes in economic conditions in relevant markets; the ability to effectively compete for market share; 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; the replacement of contracts as they are completed or expire; the ability to effectively integrate the operations of subsidiaries; retention of key personnel and qualified employees; the impact of a unionized workforce on operations and the ability to complete future acquisitions; growth outpacing infrastructure; potential exposure to environmental liabilities; requirements relating to governmental regulation; the ability 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; and the adverse impact of goodwill impairments. 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 disclaims any intention or 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, 2005 and 2004 (In thousands, except per share information) (Unaudited)

		Three Months Ended September 30,								Nine Months Ended September 30,
		2005				2004				2005				2004
Revenues		$	523,340			$	463,077			$	1,335,132			$	1,207,268
Cost of services			443,167				404,652				1,165,051				1,075,778
Gross profit			80,173				58,425				170,081				131,490
Selling, general & administrative expenses			49,420				44,265				135,756				128,396
Income from operations			30,753				14,160				34,325				3,094
Interest expense			(6,041	)			(6,379	)			(17,963	)			(18,973	)
Interest income			1,921				743				5,136				1,596
Other income (expense), net			62				80				324				(51	)
Income (loss) before taxes			26,695				8,604				21,822				(14,334	)
Provision (benefit) for taxes			13,815				4,448				10,727				(3,304	)
Net income (loss)		$	12,880			$	4,156			$	11,095			$	(11,030	)
Earnings (loss) per share
Basic		$	0.11			$	0.04			$	0.10			$	(0.10	)
Diluted		$	0.11	(a)		$	0.04			$	0.10			$	(0.10	)
Shares used in computing earnings (loss) per share:
Basic			115,970				114,683				115,640				114,343
Diluted			141,177	(a)			115,385				116,382				114,343

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

		September 30,				December 31,
		2005				2004
ASSETS
CURRENT ASSETS:
Cash and cash equivalents		$	223,636			$	265,560
Accounts receivable, net			456,075				48,828
Costs and estimated earnings in excess of billings on uncompleted contracts			51,253				42,092
Inventories			23,488				18,849
Prepaid expenses and other current assets			43,528				24,707
Total current assets			797,980				700,036
PROPERTY AND EQUIPMENT, net			307,221				314,983
ACCOUNTS AND NOTES RECEIVABLE, net			16,141				19,920
OTHER ASSETS, net			34,207				36,438
GOODWILL AND OTHER INTANGIBLES, net			388,423				388,620
Total assets		$	1,543,972			$	1,459,997
LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES:
Current maturities of long-term debt		$	1,593			$	6,236
Accounts payable and accrued expenses			244,815				203,656
Billings in excess of costs and estimated earnings on uncompleted contracts			14,291				11,166
Total current liabilities			260,699				221,058
LONG-TERM DEBT, net of current maturities			16,475				21,863
CONVERTIBLE SUBORDINATED NOTES			442,500				442,500
DEFERRED INCOME TAXES AND OTHER NON-CURRENT LIABILITIES			142,609				111,329
Total liabilities			862,283				796,750
STOCKHOLDERS’ EQUITY			681,689				663,247
Total liabilities and stockholders’ equity		$	1,543,972			$	1,459,997

# # #