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

QUANTA SERVICES REPORTS THIRD QUARTER RESULTS
Revenues increase 13%
Net income triples, EPS of $0.11

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 Program^SM (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

(a) As a result of applying the if-converted method for calculating diluted earnings per share, shares have been adjusted by 24.2 million assuming conversion of Quanta’s 4.5% convertible subordinated notes, and net income has been adjusted by $2.2 million for an addback of related interest expense, net of tax.

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

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