Fourth Quarter 2023 Earnings Review and Business Update

Top-performer across multiple O&M cost efficiency measures(1) Electric non-generation O&M / Customer Electric non-generation O&M/MWh Nuclear production expense / Nuclear Generation MWh #2/19 50 $0 $500 $1,000 #3/19 90 $0 $25 $50 $75 #2 / 11 50 $0 $25 $50 (1) Source: Company annual filings, 2022 FERC Form 1; Data as of YE 2022 unless otherwise noted; Reflects total electric O&M net of power production O&M; Figures reflect utility operations unless otherwise noted; Electric customer counts sourced from 2022 company 10-K. UTY constituents included in comparison: AEE, AEP, AES (US), CNP, D, DTE, ED, EIX, ES, ETR, EXC, FE, NEE, PEG, PNW, SO, WEC, XEL DUKE ENERGY. FOURTH QUARTER 2023 EARNINGS REVIEW AND BUSINESS UPDATE // 50

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