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REGULATORY ASSETS AND LIABILITIES (Tables) | 9 Months Ended
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Sep. 30, 2024
Regulatory Assets and Liabilities Disclosure [Abstract] |
Schedule of regulatory assets |
(in millions) |  | September 30, 2024 |  | December 31, 2023
Regulatory assets |  |  |  |
Plant retirement related items (1) |  | $ | 814.3 |  |  | $ | 646.2 |
Pension and OPEB costs |  | 721.1 |  |  | 731.7 |
Environmental remediation costs |  | 565.8 |  |  | 596.8 |
Income tax related items |  | 438.9 |  |  | 449.9 |
AROs |  | 169.3 |  |  | 162.0 |
Uncollectible expense |  | 123.4 |  |  | 127.7 |
System support resource |  | 105.5 |  |  | 113.2 |
Decoupling (2) |  | 100.5 |  |  | 27.3 |
Securitization |  | 79.1 |  |  | 85.9 |
Bluewater |  | 54.8 |  |  | 45.3 |
Derivatives |  | 50.6 |  |  | 130.3 |
Energy efficiency programs |  | 32.4 |  |  | 33.9 |
Other, net |  | 149.9 |  |  | 124.5 |
Total regulatory assets |  | $ | 3,405.6 |  |  | $ | 3,274.7 |
Balance sheet presentation |  |  |  |
Other current assets |  | $ | 59.1 |  |  | $ | 24.9 |
Regulatory assets |  | 3,346.5 |  |  | 3,249.8 |
Total regulatory assets |  | $ | 3,405.6 |  |  | $ | 3,274.7 |
(1) At September 30, 2024, plant retirement related items included $115.0 million of capitalized retirement costs related to the new EPA CCR Rule that was enacted in April 2024. See Note 23, Commitments and Contingencies, for more information. (2) PGL, NSG, and MERC have decoupling mechanisms. These mechanisms differ by state and allow the utilities to recover the differences between actual and authorized margins for certain customer classes.
Schedule of regulatory liabilities |
(in millions) |  | September 30, 2024 |  | December 31, 2023
Regulatory liabilities |  |  |  |
Income tax related items |  | $ | 1,838.0 |  |  | $ | 1,901.8 |
Removal costs |  | 1,429.5 |  |  | 1,329.9 |
Pension and OPEB benefits |  | 301.2 |  |  | 299.2 |
Energy costs refundable through rate adjustments |  | 126.0 |  |  | 72.4 |
Uncollectible expense |  | 39.2 |  |  | 21.2 |
Paris (1) |  | 31.8 |  |  | — |
Derivatives |  | 29.1 |  |  | 19.2 |
Electric transmission costs |  | 20.5 |  |  | 30.3 |
Energy efficiency programs |  | 16.7 |  |  | 17.2 |
Other, net |  | 89.6 |  |  | 54.0 |
Total regulatory liabilities |  | $ | 3,921.6 |  |  | $ | 3,745.2 |
Balance sheet presentation |  |  |  |
Other current liabilities |  | $ | 32.5 |  |  | $ | 47.5 |
Regulatory liabilities |  | 3,889.1 |  |  | 3,697.7 |
Total regulatory liabilities |  | $ | 3,921.6 |  |  | $ | 3,745.2 |
(1) In accordance with our Wisconsin rate orders approved by the PSCW in December 2023, WE and WPS are deferring to a future rate proceeding the incremental revenue requirement impact associated with the change to the in-service date of Paris.

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