Quanta Services Investor Presentation — February 2021

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This presentation (and oralstatements regarding thesubject matter ofthispresentation) includes forward -looking statements

intended toqualify under the“safe harbor” from liability established bythePrivate Securities Litigation Reform Actof1995 .

These forward -looking statements include anystatements reflecting Quanta's expectations, intentions, strategies, assumptions,

plans orbeliefs about future events orperformance orthatdonotsolely relate tohistorical orcurrent facts .Forward -looking

statements involve certain risks, uncertainties and assumptions that aredifficult topredict orbeyond Quanta's control, and

actual results may differ materially from those expected, implied orforecasted byourforward -looking statements due to

inaccurate assumptions andknown andunknown riskanduncertainties .Foradditional information concerning some ofthe

risks, uncertainties, assumptions andother factors thatcould affect ourforward -looking statements, please refer toQuanta’s

Annual Reports onForm 10-Kfortheyears ended December 31,2019 andDecember 31,2020 (when filed), Quarterly Reports

onForm 10-Qsforthequarters ended March 31,2020 ,June 30,2020 andSeptember 30,2020 andother documents filed with

theSecurities andExchange Commission, which areavailable onourwebsite (www .quantaservices .com), aswellastherisks,

uncertainties and assumptions identified inthispresentation .Investors and analysts should notplace undue reliance on

Quanta’s forward -looking statements, which arecurrent only asofthedate ofthispresentation .Quanta does notundertake and

expressly disclaims anyobligation toupdate orrevise anyforward -looking statements toreflect events orcircumstances after

thedate ofthispresentation orotherwise, andQuanta expressly disclaims anywritten ororalstatements made byanythird

party regarding thesubject matter ofthispresentation .

Certain information may beprovided inthispresentation that includes financial measurements that arenotrequired by,or

presented inaccordance with, generally accepted accounting principles (GAAP) .These non-GAAP measures should notbe

considered asalternatives toGAAP measures, such asnetincome andcash flow provided byoperating activities, andmay be

calculated differently from, andtherefore may notbecomparable to,similarly titled measures used byother companies .Fora

reconciliation tothemost directly comparable GAAP financial measures, please refer totheaccompanying reconciliation tables .

Theinformation contained inthisdocument hasnotbeen audited byanyindependent auditor .This presentation isprepared as