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REGULATORY ASSETS AND LIABILITIES | 3 Months Ended
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Mar. 31, 2023
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, 2023 and December 31, 2022. For more information on our regulatory assets and liabilities, see Note 6, Regulatory Assets and Liabilities, in our 2022 Annual Report on Form 10-K.
(in millions) |  | March 31, 2023 |  | December 31, 2022
Regulatory assets |  |  |  |
Pension and OPEB costs |  | $ | 701.9 |  |  | $ | 714.3 |
Plant retirement related items |  | 677.9 |  |  | 688.6 |
Environmental remediation costs |  | 590.6 |  |  | 610.7 |
Income tax related items |  | 457.5 |  |  | 461.9 |
Derivatives |  | 196.5 |  |  | 133.8 |
Asset retirement obligations |  | 171.1 |  |  | 169.7 |
System support resource |  | 120.9 |  |  | 123.5 |
Uncollectible expense |  | 95.9 |  |  | 69.3 |
Securitization |  | 90.9 |  |  | 92.4 |
Bluewater (1) |  | 31.4 |  |  | 20.9 |
Energy efficiency programs |  | 30.0 |  |  | 33.9 |
MERC extraordinary natural gas costs |  | 21.2 |  |  | 35.1 |
Other, net |  | 139.5 |  |  | 152.8 |
Total regulatory assets |  | $ | 3,325.3 |  |  | $ | 3,306.9 |
Balance sheet presentation |  |  |  |
Other current assets |  | $ | 12.2 |  |  | $ | 42.3 |
Regulatory assets |  | 3,313.1 |  |  | 3,264.6 |
Total regulatory assets |  | $ | 3,325.3 |  |  | $ | 3,306.9 |
(1)Primarily related to costs associated with the long-term service agreement our Wisconsin utilities have with Bluewater for natural gas storage services. The PSCW has approved escrow accounting for these costs. As a result, our Wisconsin utilities defer as a regulatory asset or liability the difference between actual storage costs and those included in rates until recovery or refund is authorized in a future rate proceeding.
(in millions) |  | March 31, 2023 |  | December 31, 2022
Regulatory liabilities |  |  |  |
Income tax related items |  | $ | 1,945.4 |  |  | $ | 1,956.6 |
Removal costs |  | 1,279.3 |  |  | 1,260.9 |
Pension and OPEB benefits |  | 335.3 |  |  | 340.5 |
Energy costs refundable through rate adjustments (1) |  | 138.5 |  |  | 53.4 |
Derivatives |  | 21.6 |  |  | 76.7 |
Decoupling |  | 21.1 |  |  | 20.2 |
Uncollectible expense |  | 20.1 |  |  | 24.0 |
Energy efficiency programs |  | 18.5 |  |  | 10.4 |
Other, net |  | 55.0 |  |  | 49.2 |
Total regulatory liabilities |  | $ | 3,834.8 |  |  | $ | 3,791.9 |
Balance sheet presentation |  |  |  |
Other current liabilities |  | $ | 145.0 |  |  | $ | 56.4 |
Regulatory liabilities |  | 3,689.8 |  |  | 3,735.5 |
Total regulatory liabilities |  | $ | 3,834.8 |  |  | $ | 3,791.9 |
(1)The increase in these regulatory liabilities was primarily due to lower natural gas costs incurred during the first quarter of 2023, compared to what was anticipated in rates.

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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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