Quanta Services (PWR) 8-K Regulation FD Disclosure

Exhibit 99.1

Quanta Services, Inc. and Subsidiaries
Supplemental Segment Data
By Quarter for the Years Ended December 31, 2008 and 2009
(Dollars in thousands)

Segment Results:

Quanta reports its results under four reportable segments; (1) Electric Power Infrastructure Services, (2) Natural Gas and Pipeline Infrastructure Services, (3) Telecommunications Infrastructure Services and (4) Fiber Optic Licensing.

	1Q08					2Q08					3Q08					4Q08					Full Year 2008
	(Unaudited)					(Unaudited)					(Unaudited)					(Unaudited)					(Audited)
Revenues from external customers:
Electric Power	$	525,841		62.3	%	$	564,554		58.8	%	$	645,511		61.3	%	$	565,660		61.4	%	$	2,301,566		60.9	%
Natural Gas and Pipeline		160,528		19.0			225,890		23.5			263,955		25.0			229,168		24.9			879,541		23.3
Telecommunications		144,865		17.2			156,974		16.3			127,060		12.1			107,879		11.7			536,778		14.2
Fiber Optic Licensing		13,208		1.5			13,464		1.4			16,829		1.6			18,827		2.0			62,328		1.6
Consolidated revenues from external customers	$	844,442		100.0	%	$	960,882		100.0	%	$	1,053,355		100.0	%	$	921,534		100.0	%	$	3,780,213		100.0	%
Operating income (loss):
Electric Power	$	43,516		8.3	%	$	58,272		10.3	%	$	82,506		12.8	%	$	63,377		11.2	%	$	247,671		10.8	%
Natural Gas and Pipeline		3,748		2.3			20,477		9.1			27,030		10.2			24,914		10.9			76,169		8.7
Telecommunications		15,339		10.6			14,270		9.1			2,970		2.3			9,338		8.7			41,917		7.8
Fiber Optic Licensing		6,178		46.8			7,918		58.8			9,195		54.6			9,482		50.4			32,773		52.6
Corporate and Non-Allocated Costs		(26,210	)	N/A			(28,415	)	N/A			(25,259	)	N/A			(29,479	)	N/A			(109,363	)	N/A
Consolidated operating income	$	42,571		5.0	%	$	72,522		7.5	%	$	96,442		9.1	%	$	77,632		8.4	%	$	289,167		7.6	%

	1Q09					2Q09					3Q09					4Q09					Full Year 2009
	(Unaudited)					(Unaudited)					(Unaudited)					(Unaudited)					(Audited)
Revenues from external customers:
Electric Power	$	534,741		72.4	%	$	503,958		62.0	%	$	512,797		65.7	%	$	516,349		52.4	%	$	2,067,845		62.3	%
Natural Gas and Pipeline		111,425		15.1			190,085		23.4			131,628		16.9			351,519		35.6			784,657		23.7
Telecommunications		73,479		9.9			96,547		11.8			113,998		14.6			94,339		9.6			378,363		11.4
Fiber Optic Licensing		18,885		2.6			22,789		2.8			22,371		2.8			23,216		2.4			87,261		2.6
Consolidated revenues from external customers	$	738,530		100.0	%	$	813,379		100.0	%	$	780,794		100.0	%	$	985,423		100.0	%	$	3,318,126		100.0	%
Operating income (loss):
Electric Power	$	53,021		9.9	%	$	58,969		11.7	%	$	66,778		13.0	%	$	47,341		9.2	%	$	226,109		10.9	%
Natural Gas and Pipeline		(1,442	)	-1.3			7,502		3.9			2,097		1.6			54,506		15.5			62,663		8.0
Telecommunications		962		1.3			5,405		5.6			12,317		10.8			6,662		7.1			25,346		6.7
Fiber Optic Licensing		9,130		48.3			11,136		48.9			11,757		52.6			12,120		52.2			44,143		50.6
Corporate and Non-Allocated Costs		(23,049	)	N/A			(23,106	)	N/A			(21,787	)	N/A			(48,197	)	N/A			(116,139	)	N/A
Consolidated operating income	$	38,622		5.2	%	$	59,906		7.4	%	$	71,162		9.1	%	$	72,432		7.4	%	$	242,122		7.3	%