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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2022
Regulatory Assets and Liabilities Disclosure [Abstract] |
Schedule of regulatory assets | The following regulatory assets were reflected on our balance sheets as of December 31:
(in millions) |  | 2022 |  | 2021 |  | See Note
Regulatory assets (1) (2) |  |  |  |  |  |
Pension and OPEB costs (3) |  | $ | 714.3 |  |  | $ | 802.3 |  |  | 20
Plant retirement related items |  | 688.6 |  |  | 722.3 |  |  |
Environmental remediation costs (4) |  | 610.7 |  |  | 630.9 |  |  | 24
Income tax related items |  | 461.9 |  |  | 458.8 |  |  | 16
AROs |  | 169.7 |  |  | 194.2 |  |  | 1(l), 9
Derivatives |  | 133.8 |  |  | 33.1 |  |  | 1(s)
SSR (5) |  | 123.5 |  |  | 129.5 |  |  |
Securitization |  | 92.4 |  |  | 100.7 |  |  | 23
Uncollectible expense |  | 69.3 |  |  | 42.6 |  |  | 5
MERC extraordinary natural gas costs (6) |  | 35.1 |  |  | 59.7 |  |  | 26
Energy efficiency programs (7) |  | 33.9 |  |  | 22.0 |  |  |
Energy costs recoverable through rate adjustments |  | 26.9 |  |  | 85.4 |  |  | 1(d), 26
Other, net |  | 146.8 |  |  | 85.6 |  |  |
Total regulatory assets |  | $ | 3,306.9 |  |  | $ | 3,367.1 |  |  |
Balance sheet presentation |  |  |  |  |  |
Other current assets |  | $ | 42.3 |  |  | $ | 102.3 |  |  |
Regulatory assets |  | 3,264.6 |  |  | 3,264.8 |  |  |
Total regulatory assets |  | $ | 3,306.9 |  |  | $ | 3,367.1 |  |  |
(1) Based on prior and current rate treatment, we believe it is probable that our utilities will continue to recover from customers the regulatory assets in this table. In accordance with GAAP, our regulatory assets do not include the allowance for ROE that is capitalized for regulatory purposes. This allowance was $27.3 million and $30.9 million at December 31, 2022 and 2021, respectively. (2) As of December 31, 2022, we had $237.9 million of regulatory assets not earning a return, $35.3 million of regulatory assets earning a return based on short-term interest rates, and $123.5 million of regulatory assets earning a return based on long-term interest rates. The regulatory assets not earning a return primarily relate to certain environmental remediation costs, uncollectible expense, MERC's extraordinary natural gas costs, our invested capital tax rider, and unamortized loss on reacquired debt. The other regulatory assets in the table either earn a return at the applicable utility's weighted average cost of capital or the cash has not yet been expended, in which case the regulatory assets are offset by liabilities. (3) Primarily represents the unrecognized future pension and OPEB costs related to our defined benefit pension and OPEB plans. We are authorized recovery of these regulatory assets over the average remaining service life of each plan. (4) As of December 31, 2022, we had made cash expenditures of $111.1 million related to these environmental remediation costs. The remaining $499.6 million represents our estimated future cash expenditures. (5) This regulatory asset relates to WE's 2014 announcement to retire the PIPP. Despite WE's intent to retire the PIPP, MISO designated the PIPP as an SSR, which meant the PIPP's operation was necessary for reliability, and the plant could not be shut down until new generation or transmission facilities were built. In December 2014, the PSCW authorized escrow accounting for WE's SSR revenues because of the fluctuations in the actual revenues WE received under the PIPP SSR agreements. The rate order WE received from the PSCW in December 2019 authorized recovery of this SSR regulatory asset over a 15-year period that began on January 1, 2020. (6) Represents the extraordinary natural gas costs MERC incurred during February 2021 that are being recovered over 27 months, beginning in September 2021. See Note 26, Regulatory Environment, for more information on our recovery efforts associated with these costs. (7) Represents amounts recoverable from customers related to programs at the utilities designed to meet energy efficiency standards.
Schedule of regulatory liabilities | The following regulatory liabilities were reflected on our balance sheets as of December 31:
(in millions) |  | 2022 |  | 2021 |  | See Note
Regulatory liabilities |  |  |  |  |  |
Income tax related items |  | $ | 1,956.6 |  |  | $ | 1,998.5 |  |  | 16
Removal costs (1) |  | 1,260.9 |  |  | 1,248.0 |  |  |
Pension and OPEB benefits (2) |  | 340.5 |  |  | 397.3 |  |  | 20
Derivatives |  | 76.7 |  |  | 124.1 |  |  | 1(s)
Energy costs refundable through rate adjustments |  | 53.4 |  |  | 13.7 |  |  | 1(d)
Uncollectible expense |  | 24.0 |  |  | 37.1 |  |  | 5
Earnings sharing mechanisms |  | 12.9 |  |  | 28.4 |  |  | 26
Electric transmission costs (3) |  | 0.4 |  |  | 84.2 |  |  |
Other, net |  | 66.5 |  |  | 29.0 |  |  |
Total regulatory liabilities |  | $ | 3,791.9 |  |  | $ | 3,960.3 |  |  |
Balance sheet presentation |  |  |  |  |  |
Other current liabilities |  | $ | 56.4 |  |  | $ | 14.3 |  |  |
Regulatory liabilities |  | 3,735.5 |  |  | 3,946.0 |  |  |
Total regulatory liabilities |  | $ | 3,791.9 |  |  | $ | 3,960.3 |  |  |
(1) Represents amounts collected from customers to cover the future cost of property, plant, and equipment removals that are not legally required. Legal obligations related to the removal of property, plant, and equipment are recorded as AROs. See Note 9, Asset Retirement Obligations, for more information on our legal obligations. (2) Primarily represents the unrecognized future pension and OPEB benefits related to our defined benefit pension and OPEB plans. We will amortize these regulatory liabilities into net periodic benefit cost over the average remaining service life of each plan. (3) In accordance with the PSCW's approval of escrow accounting for ATC and MISO network transmission expenses for our Wisconsin electric utilities, WE and WPS defer as a regulatory asset or liability the difference between actual transmission costs and those included in rates until recovery or refund is authorized in a future rate proceeding. During 2022, WE and WPS amortized $81.0 million of their transmission regulatory liabilities to offset certain 2022 revenue deficiencies, as approved by the PSCW in order to forego filing for 2022 base rate increases. See Note 26, Regulatory Environment, for more information.

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