Quanta Services Announces 2006 Fourth Quarter and Year End Earnings Release and Conference Call Schedule

HOUSTON, Feb. 20 /PRNewswire-FirstCall/ -- Quanta Services, Inc. (NYSE: PWR) announced today that it will release 2006 fourth quarter and year end results on Thursday, February 22, 2007, before the market opens. In conjunction with the release, Quanta has scheduled a conference call which will be broadcast live over the Internet on Thursday, February 22, 2007, at 9:30 a.m. Eastern time.

     What:   Quanta Services 2006 Fourth Quarter and Year End Earnings
             Conference Call

     When:   Thursday, February 22, 2007 - 9:30 a.m. Eastern time

     How:    Live via phone - By dialing (303) 205-0033 and asking for the
             Quanta Services call at least 10 minutes prior to the start time.
             Live over the Internet - by logging on to the web at the address
             below.

     Where:  http://www.quantaservices.com

For those who cannot listen to the live call, a telephonic replay will be available through March 1, 2007, and may be accessed by calling (303) 590-3000 and using the pass code 11083521. Also, an archive of the webcast will be available shortly after the call on the company's website at http://www.quantaservices.com . For more information, please contact Karen Roan at DRG&E at 713-529-6600 or email kcroan@drg-e.com .

     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

SOURCE Quanta Services, Inc.

Released February 20, 2007