Fourth Quarter 2023 Earnings Review and Business Update

Modern recovery mechanisms and pending rate cases Pending rate case Evaluating rate case Modern recovery mechanism JURISDICTION 2023 2024 2025 2026 2027 2028 DEC NC - Multi-year rate plan SC Pending DEP NC - Multi-year rate plan Storm Protection Plan (SPP) - Filed annually(1) DEF DEI DEO Multi-year rate plan Multi-year rate plan pending (2) TDSIC/Environmental riders - Filed at least annually Evaluating Electric Distribution / Transmission and Gas investment riders – Filed quarterly/annually DEK Gas Pipeline Modernization Rider - Filed annually NC Integrity management riders – Filed semi-annually; TN ARM(3) - Filed annually; SC RSA – Filed annually Piedmont Evaluating - NC (1) SPP 10-year plan filed every 3 years. Cost recovery process is annual (2) On January 31, 2024, DEF filed its Test Year Notification with the Florida Public Service Commission, proposing 2025-2027 as test periods for multi-year rate plan adjustments (3) TPUC approved adoption of the Annual Review Mechanism (ARM) in 2022. The initial year of true up is 2022, and the initial rate adjustments filed in 2023 were approved effective October 1, 2023 DUKE ENERGY FOURTH QUARTER 2023 EARNINGS REVIEW AND BUSINESS UPDATE // 39

View entire presentation