Quanta Services Investor Presentation — July 2017

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Acquisition of Stronghold

Investor Conference Call Presentation

Forward Looking Statement Disclaimer

This presentation (and oral statements regarding thesubject matter ofthis presentation) includes forward -looking statements intended toqualify

under the“safe harbor” from liability established bythePrivate Securities Litigation Reform Actof1995. These forward -looking statements include

any statements reflecting Quanta's expectations, intentions, strategies, assumptions orbeliefs about future events orperformance orthat donot

solely relate tohistorical orcurrent facts .Forward -looking statements involve certain risks, uncertainties and assumptions that are difficult to

predict orbeyond Quanta's control, and actual results may differ materially from those expected, implied orforecasted byour forward -looking

statements due toinaccurate assumptions and known and unknown risk and uncertainties .Foradditional information concerning some ofthe

risks, uncertainties and assumptions that could affect ourforward -looking statements, please refer toQuanta’s Annual Report onForm 10-Kforthe

year ended December 31,2016 and itsother documents filed with theSecurities and Exchange Commission, aswell astherisks, uncertainties and

assumptions identified inthis presentation .Investors and analysts should notplace undue reliance onQuanta’s forward -looking statements, which

arecurrent only asofthedate ofthis presentation .Quanta does not undertake and expressly disclaims any obligation toupdate orrevise any

forward -looking statements toreflect events orcircumstances after thedate ofthis presentation orotherwise, and Quanta expressly disclaims any

written ororal statements made byanythird party regarding thesubject matter ofthis presentation .

2Introduction & Agenda

•Stronghold Companies Overview

•Strategic Rationale

•Acquisition Financial Overview

•Industrial Services Industry Drivers

•Strategic Imperatives Alignment

•Forward Looking Statement DisclaimerDuke Austin – President & Chief Executive Officer

Derrick Jensen –Chief Financial OfficerConference Call Hosts

Conference Call Agenda

3Stronghold Overview

•A private company formed in 2002 that initially focused on providing catalyst handling services

and has since grown organically and expanded its service offerings to include turnaround and

other downstream services, tank storage and other midstream services

•Specializes in high pressure and high reactor infrastructure services

•Headquartered in La Porte, Texas