Investor Presentaiton

(September 30, 2023) Net Debt/ Adj. EBITDA (2) ~2.2X Quanta's investment-grade credit rating, coupled with solid liquidity levels, affords management the ability to continue to opportunistically deploy capital BALANCE SHEET STRENGTH PROVIDES FLEXIBILITY Strong Financial Foundation ($ in millions) Cash and Equivalents Other Debt 0.95% Sr. Notes due Oct. 2024 2.90% Sr. Notes due Oct. 2030 2.35% Sr. Notes due Jan. 2032 3.05% Sr. Notes due Oct. 2041 Commercial Paper Term Debt Credit Facility Total Debt 12/31/2019 12/31/2020 12/31/2021 12/31/2022 9/30/2023 $ 165 $ 185 $229 $429 $305 21 40 54 70 119 500 500 500 1,000 1,000 1,000 1,000 500 500 500 500 500 500 -- 373 397 1,241 750 750 736 105 149 450 37 230 1,367 1,189 3,754 3,730 3,982 4,054 4,349 5,117 5,399 5,996 $ 5,421 $ 5,538 $8,871 $9,129 $9,978 $2,431 $2,198 $2,101 Total Equity Total Capitalization Liquidity (1) $2,007 $1,811 ($ in millions) $2,002 $2,013 $1,872 $1,702 $1,646 $165 12/31/19 $185 12/31/20 $229 12/31/21 $429 12/31/22 $305 9/30/2023 ■Cash QUANTA ■Credit Facility (Unused) (1) Liquidity includes cash and cash equivalents and availability under our senior credit facility. Available commitments for revolving loans under the senior credit facility must be maintained in order to provide credit support for notes issued under the commercial paper program, and therefore such notes effectively reduce the available borrowing capacity under the senior credit facility. (2) Calculated as defined in our credit agreement for our senior credit facility. (Includes total debt, as well as certain other items, including letters of credit.) Page 40

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