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REGULATORY ASSETS AND LIABILITIES | 6 Months Ended
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Jun. 30, 2026
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 June 30, 2026 and December 31, 2025. For more information on our regulatory assets and liabilities, see Note 6, Regulatory Assets and Liabilities, in our 2025 Annual Report on Form 10-K.
(in millions) |  | June 30, 2026 |  | December 31, 2025
Regulatory assets |  |  |  |
Plant retirement related items |  | $ | 736.6 |  |  | $ | 768.6 |
Environmental remediation costs |  | 545.6 |  |  | 566.0 |
Income tax related items |  | 531.4 |  |  | 493.4 |
Pension and OPEB costs |  | 524.9 |  |  | 564.5 |
AROs |  | 205.5 |  |  | 185.1 |
System support resource |  | 87.5 |  |  | 92.6 |
Decoupling |  | 81.0 |  |  | 43.8 |
Electric transmission costs |  | 73.8 |  |  | 30.7 |
Uncollectible expense |  | 71.1 |  |  | 123.9 |
Securitization |  | 63.6 |  |  | 67.5 |
Derivatives |  | 48.7 |  |  | 57.7 |
Finance and operating leases |  | 44.5 |  |  | 36.0 |
Bluewater |  | 28.6 |  |  | 37.7 |
Energy costs recoverable through rate adjustments |  | 24.3 |  |  | 6.7 |
Other, net |  | 102.0 |  |  | 99.4 |
Total regulatory assets |  | $ | 3,169.1 |  |  | $ | 3,173.6 |
Balance sheet presentation |  |  |  |
Other current assets |  | $ | 38.7 |  |  | $ | 17.3 |
Regulatory assets |  | 3,130.4 |  |  | 3,156.3 |
Total regulatory assets |  | $ | 3,169.1 |  |  | $ | 3,173.6 |
(in millions) |  | June 30, 2026 |  | December 31, 2025
Regulatory liabilities |  |  |  |
Income tax related items |  | $ | 1,776.9 |  |  | $ | 1,802.4 |
Removal costs |  | 1,660.8 |  |  | 1,584.7 |
Pension and OPEB benefits |  | 298.0 |  |  | 301.5 |
Energy costs refundable through rate adjustments |  | 152.6 |  |  | 119.2 |
Settlement related to QIP and UEA riders |  | 125.0 |  |  | 125.0 |
Uncollectible expense |  | 79.9 |  |  | 73.1 |
Derivatives |  | 49.3 |  |  | 27.4 |
Earnings sharing mechanisms |  | 34.0 |  |  | 35.8 |
MERC property tax tracker |  | 24.9 |  |  | 23.1 |
Energy efficiency programs |  | 16.8 |  |  | 12.2 |
Other, net |  | 107.3 |  |  | 105.8 |
Total regulatory liabilities |  | $ | 4,325.5 |  |  | $ | 4,210.2 |
Balance sheet presentation |  |  |  |
Other current liabilities |  | $ | 95.9 |  |  | $ | 88.9 |
Regulatory liabilities |  | 4,229.6 |  |  | 4,121.3 |
Total regulatory liabilities |  | $ | 4,325.5 |  |  | $ | 4,210.2 |

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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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