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Schedule I - Condensed Financial Information of Registrant - CONDENSED STATEMENTS OF INCOME, PARENT COMPANY (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income |  |  |
Other Income | $ 18,848 | $ 12,650 | $ 2,037
Expense |  |  |
Nonelectric Selling, General, and Administrative Expenses | 80,065 | 72,663 | 69,718
Interest Expense | 41,815 | 37,677 | 36,016
Nonservice Cost Components of Postretirement Benefits | (9,609) | (10,597) | (1,075)
Income Before Income Taxes | 366,892 | 363,489 | 357,535
Income Tax Benefit | (65,230) | (69,298) | (73,351)
Net Income | 301,662 | 294,191 | 284,184
OTC |  |  |
Income |  |  |
Other Income | 15,085 | 10,496 | 466
Total Income | 322,717 | 307,861 | 300,681
Expense |  |  |
Nonelectric Selling, General, and Administrative Expenses | 23,016 | 12,816 | 17,269
Nonservice Cost Components of Postretirement Benefits | 970 | 1,063 | 1,023
Total Expense | 27,590 | 17,698 | 22,363
Income Before Income Taxes | 295,127 | 290,163 | 278,318
Income Tax Benefit | 6,535 | 4,028 | 5,866
Net Income | 301,662 | 294,191 | 284,184
OTC | Subsidiaries |  |  |
Income |  |  |
Equity Income in Earnings of Subsidiaries | 304,525 | 294,467 | 296,833
Interest Income from Subsidiaries | 3,107 | 2,898 | 3,382
Expense |  |  |
Interest Expense | 5 | 6 | 5
OTC | Nonrelated Party |  |  |
Expense |  |  |
Interest Expense | $ 3,599 | $ 3,813 | $ 4,066

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