Investor Presentaiton

QUANTA IS FOCUSED ON LONG-TERM CORPORATE RESPONSIBILITY AND SUSTAINABILITY PEOPLE PLANET PRINCIPLES • • • Safety drives everything we do our employees are our #1 asset Have incrementally invested +$150mm in training and safety initiatives for our employees • $1.12 billion in diverse vendor spend in 2022 • 30% of individuals trained at campus career programs at Northwest Lineman College (NLC) during 2022 were ethnically diverse - an increase from 26% in 2019 • • Facilitating efficient and safe delivery of clean energy and the migration towards a reduced-carbon economy We are leading the way in expanding renewable generation capacity in the US Quanta has an industry-leading reputation for environmental stewardship during its projects Partnership with General Motors to incorporate a significant number of Chevrolet Silverado EVs into our fleet • Board-level oversight of ESG-related matters Experienced and Diverse Board of Directors - 45% gender/ethnic diversity sps 20% of 2023 target annual cash incentive and 20% of 2023 target LTIP linked to achieving safety and sustainability goals QUANTA'S SUSTAINABILITY MISSION centers on collaborating with our customers to meet their needs and creating value for stakeholders, while focusing on employee safety and conducting our business in a socially, economically and environmentally responsible manner MSCI AA ESG RATINGS CCC B BB BBB A AA AAA Quanta's MSCI ESG rating as of 2021. The use by Quanta or any MSCI ESG Research LLC or its affiliates ("MSC) data, and the use of MSCI logos, trademarks, service marks or index names herein, do not constitute a sponsorship, endorsement, recommendation, or promotion or Quanta by MSCI. MSCI services and data are the property of MSCI or Its information providers and are provided 'as-is' and without warranty. MSCI names and logos are trademarks or service marks of MSCL QUANTA Quanta's 2022 Corporate Responsibility Report https://sustainability.quantaservices.com Page 5

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