Quanta Services Investor Presentation — December 2021

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Repeatable. Sustainable. RESILIENTPage 2This 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 or

performance orthatdonotsolely relate tohistorical orcurrent facts .Forward -looking statements involve certain risks, uncertainties andassumptions thataredifficult topredict orbeyond Quanta's control, andactual

results may differ materially from those expected, implied orforecasted byourforward -looking statements duetoinaccurate assumptions andknown andunknown riskanduncertainties .Foradditional information

concerning some oftherisks, uncertainties, assumptions andother factors thatcould affect ourforward -looking statements, please refer toQuanta’s Annual Report onForm 10-Kfortheyear ended December 31,

2020 ,Quanta’s Quarterly Reports onForm 10-Qforthequarters ended March 31,2021 ,June 30,2021 andSeptember 30,2021 andother documents filed withtheSecurities andExchange Commission, which are

available onourwebsite (www .quantaservices .com), aswellastherisks, uncertainties andassumptions identified inthispresentation .Investors andanalysts should notplace undue reliance onQuanta’s forward -

looking statements, which arecurrent only asofthedate ofthispresentation .Quanta does notundertake andexpressly disclaims anyobligation toupdate orrevise anyforward -looking statements toreflect events or

circumstances after thedate ofthispresentation orotherwise, andQuanta expressly disclaims anywritten ororalstatements made byanythird party regarding thesubject matter ofthispresentation .

Additionally, anyfinancial projections inthispresentation areforward -looking statements thatarebased onassumptions thatareinherently subject tosignificant uncertainties andcontingencies, many ofwhich are

beyond Quanta's control .While such projections arenecessarily speculative, Quanta believes thatthepreparation ofprospective financial information involves increasingly higher levels ofuncertainty thefurther out

theprojection extends from thedate ofpreparation .Theassumptions andestimates underlying such projected results areinherently uncertain andaresubject toawide variety ofsignificant business, economic and

competitive risks anduncertainties thatcould cause actual results todiffer materially from those contained intheprojections .Theinclusion offinancial information orprojections inthispresentation should notbe

regarded asanindication thatQuanta considered orconsider theinformation orprojections tobeareliable prediction offuture events .