Investor Presentaiton

Grid Needs Firm Resources To Be Reliable VISTRA Gas plants ramp up to support the grid load when wind generation drops ERCOT generation during Winter Storm Elliott MWh per hour 70,000 ERCOT generation during Winter Storm Mara MWh per hour 70,000 60,000 50,000 40,000 30,000 20,000 10,000 60,000 50,000 40,000 30,000 20,000 10,000 0 0 12/19 2022 12/21 12/23 12/25 12/27 2022 1/29 2023 1/31 2/2 2/4 2/6 2023 Hydro Coal (<40 yrs) Natural Gas (<40 yrs) Other Wind Thermal (>40 yrs) Nuclear Solar 29 Vistra Investor Presentation / June 2023

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