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REGULATORY ASSETS AND LIABILITIES | 3 Months Ended
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Mar. 31, 2025
Regulatory Assets and Liabilities Disclosure [Abstract] |
REGULATORY ASSETS AND LIABILITIES | REGULATORY ASSETS AND LIABILITIES The following regulatory assets and liabilities were reflected on our balance sheets at March 31, 2025 and December 31, 2024. For more information on our regulatory assets and liabilities, see Note 6, Regulatory Assets and Liabilities, in our 2024 Annual Report on Form 10-K.
(in millions) |  | March 31, 2025 |  | December 31, 2024
Regulatory assets |  |  |  |
Plant retirement related items |  | $ | 820.8 |  |  | $ | 810.5 |
Pension and OPEB costs |  | 660.4 |  |  | 684.9 |
Environmental remediation costs |  | 540.7 |  |  | 570.1 |
Income tax related items |  | 446.3 |  |  | 438.5 |
AROs |  | 170.3 |  |  | 166.7 |
Uncollectible expense |  | 133.4 |  |  | 151.5 |
Decoupling |  | 129.1 |  |  | 110.0 |
System support resource |  | 100.4 |  |  | 102.9 |
Securitization |  | 74.3 |  |  | 76.5 |
Energy costs recoverable through rate adjustments |  | 72.2 |  |  | 8.3 |
Bluewater |  | 55.1 |  |  | 57.7 |
Finance and operating leases |  | 26.0 |  |  | 22.0 |
Energy efficiency programs |  | 17.3 |  |  | 26.5 |
Derivatives |  | 7.7 |  |  | 38.2 |
Other, net |  | 113.8 |  |  | 114.4 |
Total regulatory assets |  | $ | 3,367.8 |  |  | $ | 3,378.7 |
Balance sheet presentation |  |  |  |
Other current assets |  | $ | 84.5 |  |  | $ | 39.0 |
Regulatory assets |  | 3,283.3 |  |  | 3,339.7 |
Total regulatory assets |  | $ | 3,367.8 |  |  | $ | 3,378.7 |
(in millions) |  | March 31, 2025 |  | December 31, 2024
Regulatory liabilities |  |  |  |
Income tax related items |  | $ | 1,810.7 |  |  | $ | 1,825.4 |
Removal costs |  | 1,492.2 |  |  | 1,458.2 |
Pension and OPEB benefits |  | 302.1 |  |  | 308.5 |
Energy costs refundable through rate adjustments |  | 224.9 |  |  | 160.8 |
Derivatives |  | 94.8 |  |  | 36.9 |
Uncollectible expense |  | 45.7 |  |  | 47.2 |
Revenue requirements of renewable generation facilities |  | 42.5 |  |  | 44.2 |
Property tax (1) |  | 19.6 |  |  | 19.3 |
Electric transmission costs |  | 16.2 |  |  | 19.7 |
Other, net |  | 94.7 |  |  | 83.1 |
Total regulatory liabilities |  | $ | 4,143.4 |  |  | $ | 4,003.3 |
Balance sheet presentation |  |  |  |
Other current liabilities |  | $ | 99.5 |  |  | $ | 45.3 |
Regulatory liabilities |  | 4,043.9 |  |  | 3,958.0 |
Total regulatory liabilities |  | $ | 4,143.4 |  |  | $ | 4,003.3 |
(1)In accordance with MERC's property tax tracker, MERC defers as a regulatory asset or liability the difference between actual property tax expense and the amount included in rates until recovery or refund is authorized in a future rate proceeding.

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- Definition The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit. + References No definition available. + Details
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