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Schedule I - Condensed Financial Information of Registrant (Condensed Statements of Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Operating Expenses |  |  |
Other operating expenses | $ (1,638) | $ (1,687) | $ (1,669)
Total operating expenses | (6,028) | (6,227) | (7,372)
Operating income | 1,487 | 1,235 | 1,224
Other Income (Expense) |  |  |
Equity earnings of subsidiaries | 7 | 7 | 3
Non-operating retirement benefits, net | 169 | 180 | 205
Other expense | (32) | (13) | (27)
Total other income | 344 | 362 | 197
Interest Charges |  |  |
Interest on long-term debt | 700 | 616 | 509
Total interest charges | 708 | 643 | 519
Income (Loss) Before Income Taxes | 1,123 | 954 | 902
Income Tax Expense | 176 | 147 | 93
Net Income | 1,003 | 887 | 837
Preferred Stock Dividends | 10 | 10 | 10
Net Income (Loss) Available to Common Stockholders | 993 | 877 | 827
Related Party |  |  |
Interest Charges |  |  |
Intercompany interest expense and other | 12 | 12 | 12
CMS Energy |  |  |
Operating Expenses |  |  |
Other operating expenses | 10 | 10 | 7
Total operating expenses | 10 | 10 | 7
Operating income | (10) | (10) | (7)
Other Income (Expense) |  |  |
Non-operating retirement benefits, net | (1) | (1) | (1)
Other income | 45 | 31 | 5
Other expense | 0 | 0 | (1)
Total other income | 1,105 | 959 | 983
Interest Charges |  |  |
Interest on long-term debt | 205 | 201 | 181
Total interest charges | 215 | 211 | 189
Income (Loss) Before Income Taxes | 880 | 738 | 787
Income Tax Expense | (19) | (20) | (50)
Net Income | 899 | 758 | 837
Preferred Stock Dividends | 10 | 10 | 10
Net Income (Loss) Available to Common Stockholders | 889 | 748 | 827
CMS Energy | Related Party |  |  |
Other Income (Expense) |  |  |
Equity earnings of subsidiaries | 1,061 | 929 | 980
Interest Charges |  |  |
Intercompany interest expense and other | $ 10 | $ 10 | $ 8

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