Quanta Services Investor Presentation — October 2020

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E a r n i n g s C a l l P r e s e n t a t i o n

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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 Report onForm 10-Kfortheyear ended December 31,2019 ,Quarterly Report onForm 10-Qsforthequarters ended

March 31,2020 ,June 30,2020 and September 30,2020 (when filed) and other documents filed with theSecurities and

Exchange Commission, which areavailable onourwebsite (www .quantaservices .com), aswellastherisks, uncertainties and

assumptions identified inthispresentation .Investors andanalysts should notplace undue reliance onQuanta’s forward -looking

statements, which arecurrent only asofthedate ofthispresentation .Quanta does notundertake andexpressly disclaims any

obligation toupdate orrevise any forward -looking statements toreflect events orcircumstances after thedate ofthis

presentation orotherwise, andQuanta expressly disclaims anywritten ororalstatements made byanythird party regarding the

subject 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