Investor Presentaiton

Generation Historical Cost of Production Year $/MWh . 1955-FERC license issued to construct PRP % Avg Water MWh Gen . Both dams were generating power by 1963 (Priest Rapids Development first power generation in 1959, Wanapum first power generation in 1963). 2023 $27.38 74% 6,965,606 At the time the final unit was installed, PRP was the largest non-federal project Long-term power sales contracts for separate developments with 8 Northwest utilities through 2005/2009 2022 $20.74 111% 9,258,486 2021 $20.00 87% 9,056,940 • 2005 & 2009- new offtake contracts went into effect - combined output of Priest Rapids and Wanapum developments with 26 purchasers 2020 $18.02 104% 9,463,889

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