Investor Presentaiton

Generation & Other Power Sources. • Two in-county small hydro generation projects operated by the District with rights to output, contracts with the Columbia Hydro Power Authority (owner), expiry in 2025 and 2030 • Nine-Canyon Wind Farm output contract managed by Energy Northwest, expiry in 2030 Bonneville PF contract for small Grand Coulee area load (~5 aMW), expiry in 2028 District manages wholesale program through long-term and short-term market contracts to meet retail load and to manage wholesale position WANAPUM DAM Generation Units Rated Capacity Concrete/Earthfill Length Rated Head.... Construction Started.. First Power Generation. Seattle Wanapum Dam Priest Rapids Dam PRIEST RAPIDS DAM Rated Capacity. Spokane Grant County QUINCY CHUTE HYDROELECTRIC PROJECT 10 1,221.7 MW Rated Capacity 8,637 FT First Power Generation.. 80 FT 1959 1963 Generation Units 10 Concrete/Earthfill Length Rated Head... Construction Started. First Power Generation. 950 MW .10,103 FT 78 FT 1956 1959 POTHOLES EAST CANAL HEADWORKS PROJECT Rated Capacity.. First Power Generation.. 9.4 MW 1985 .6.5 MW 1990 6 NINE CANYON WIND PROJECT 12.5% of Project Peak Capacity ....... 12 MW 2003 First Power Generation.... *2022 Annual Report

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