Energy Storage Value and Adoption Analysis

Storage MW as % of System Peak 14% 12% 10% Comparison to Other Studies Comparison of Cost-Effective Storage Deployment Levels Across Studies We find lower cost-effective storage levels than other studies in 2020 (proportional to system peak). 2030 findings similar to NY study. Massachusetts New York ■(Peaker Retirement case) New York ■(Peaker Retirement case) ■Nevada (Low Cost Case) ■New York (Base Case) Nevada (High Cost Case) 8% ■Texas (Brattle) 6% ■New York (Base Case) ■Texas (Navigant) 4% 2% ■Nevada (Low Cost Case) 0% 2018 2020 ■Nevada (High Cost Case) 2022 2024 2026 2028 2030 brattle.com 31

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