Investor Presentaiton

Generation 2023 PRP Project Cost Allocation Grant PUD 86.22% PacifiCorp 3.02% Portland General 3.02% Puget Sound Energy 1.74% Avista 1.33% Tacoma Power 0.69% Seattle City Light 0.67% Cowlitz PUD 0.39% EWEB 0.34% Exchangers (9 small shares) 2.58% 100% •The long-term contracts define output rights and percentage share of production costs on an annual basis. •Grant's output rights are to claim physical power to meet load on a critical water planning basis up to 63.3% of output. •Grant's retail load met this level in 2014 •6.69% of output contractually goes to long term purchasers 2.48% Exchangers, 4.21% Conversion Contracts ⚫Historically purchasers received a larger share of output as Grant's load was growing

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