Investor Presentaiton

Expected Energy Generation 9,000 8,000 Solar Hybrid 7,000 Generation (GWh) 6,000 5,000 4,000 3,000 2,000 1,000 0 Solar Wind Gas | Pooling Agreement Nine Canyon Small Hydro/BPA PRP PRP Under Contract 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 Integrated Resource Plan (IRP) Selected Portfolio (Energy) 2025 2026 2027 2028 2029 2030 2031 • State law requires that every two years we develop a comprehensive resource plan From Existing Portfolio (aMW) 675 637 634 647 637 640 644 • IRP assesses customer electric needs over a ten-year planning horizon From Portfolio Additions (aMW) 127 152 177 202 233 266 263 . Sufficient resource to meet forecast energy requirements through the expiration of our pooling agreement in 2025 Total from Selected Portfolio (aMW) 803 790 812 849 869 906 908 • Need to obtain additional clean energy resources to meet primary Clean Energy Transformation Act compliance beginning in 2030 Additional Needs for Load (aMW) 28 32 20 36 20 21 3 16 *2022 Integrated Resource Plan

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