Fourth Quarter 2023 Earnings Review and Business Update

FFO to Debt Calculation Duke Energy Ohio (in millions) Year Ended December 31, 2023 Cash From Operations Adjust for Working Capital (1) Coal Ash ARO spend Include capitalized Interest as cost Lease-imputed FFO adjustment (D&A) Funds From Operations Notes payable to affiliated companies LT debt LT debt payable to affiliates CRC Underfunded pension Lease imputed debt Actual 506 226 13 (16) 10 739 613 3,493 25 159 52 17 Total Balance Sheet Debt (Including ST) 4,359 (1) Working capital detail, excluding MTM Receivables Receivables from affiliates Inventory Other current assets Accounts payable Accounts payable to affiliates Taxes accrued Other current liabilities FFO / Debt (38) (40) (35) (23) (34) (1) (1) (54) (226) 17%

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