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Schedule I - Condensed Financial Information of Registrant (Condensed Balance Sheets) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Current Assets |  |
Cash and cash equivalents | $ 103 | $ 227
Prepayments and other current assets | 103 | 80
Total current assets | 2,790 | 2,839
Other Non‑current Assets |  |
Construction work in progress | 2,098 | 944
Investments in subsidiaries | 64 | 74
Other | 384 | 357
Total other non‑current assets | 5,669 | 5,606
Total Assets | 35,920 | 33,517
Current Liabilities |  |
Current portion of long-term debt | 1,192 | 975
Accrued interest, including intercompany | 156 | 142
Accrued taxes | 654 | 612
Other current liabilities | 209 | 149
Total current liabilities | 3,521 | 2,895
Non‑current Liabilities |  |
Long-term debt | 15,194 | 14,508
Postretirement benefits | 96 | 106
Other non‑current liabilities | 407 | 415
Total non‑current liabilities | 23,651 | 22,497
Equity |  |
Common stock | 3 | 3
Total common stockholders’ equity | 8,006 | 7,320
Cumulative preferred stock | 224 | 224
Total stockholders’ equity | 8,230 | 7,544
Total Liabilities and Equity | 35,920 | 33,517
CMS Energy |  |
Current Assets |  |
Cash and cash equivalents | 4 | 149
Taxes receivable | 0 | 11
Prepayments and other current assets | 1 | 0
Total current assets | 53 | 229
Other Non‑current Assets |  |
Construction work in progress | 1 | 0
Deferred income taxes | 150 | 137
Other investments | 9 | 8
Other | 21 | 24
Total other non‑current assets | 13,172 | 12,166
Total Assets | 13,225 | 12,395
Current Liabilities |  |
Current portion of long-term debt | 740 | 250
Accrued interest, including intercompany | 34 | 37
Accrued taxes | 16 | 0
Other current liabilities | 6 | 9
Total current liabilities | 870 | 371
Non‑current Liabilities |  |
Long-term debt | 4,226 | 4,471
Notes payable – intercompany | 100 | 105
Postretirement benefits | 14 | 15
Other non‑current liabilities | 17 | 18
Total non‑current liabilities | 4,357 | 4,609
Equity |  |
Common stock | 3 | 3
Other stockholders’ equity | 7,771 | 7,188
Total common stockholders’ equity | 7,774 | 7,191
Cumulative preferred stock | 224 | 224
Total stockholders’ equity | 7,998 | 7,415
Total Liabilities and Equity | 13,225 | 12,395
CMS Energy | Intercompany |  |
Current Assets |  |
Notes receivable | 40 | 60
Other Non‑current Assets |  |
Investments in subsidiaries | 12,400 | 11,701
Investment in debt securities – intercompany | 591 | 296
Current Liabilities |  |
Accounts and notes payable – intercompany | 74 | 75
CMS Energy | Intercompany and related parties |  |
Current Assets |  |
Accounts receivable – intercompany and related parties | $ 8 | $ 9

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