| REGULATORY ASSETS AND LIABILITIES The following regulatory assets and liabilities were reflected on our balance sheets at September 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) | | September 30, 2026 | | December 31, 2025 | | Regulatory assets | | | | | | Environmental remediation costs | | $ | 126.6 | | | $ | 133.5 | | | Plant retirement related items | | 110.0 | | | 122.9 | | | AROs | | 66.4 | | | 49.1 | | | Income tax related items | | 62.9 | | | 59.3 | | | Electric transmission costs | | 29.0 | | | 15.4 | | | Finance and operating leases | | 12.5 | | | 10.2 | | | Derivatives | | 11.0 | | | 4.8 | | Revenue requirements of generation facilities (1) | | 8.3 | | | 0.6 | | | Pension and OPEB costs | | 8.0 | | | 19.8 | | | Bluewater Natural Gas Holding, LLC | | 5.0 | | | 8.7 | | | Other, net | | 14.9 | | | 21.9 | | | Total regulatory assets | | $ | 454.6 | | | $ | 446.2 | | | | | | | | | | | | | | | | | | | | | | | | | | |
(1)These amounts primarily represent the deferral of the incremental revenue requirement of incurred costs resulting from changes to the previously planned retirement of Columbia Units 1 and 2. | | | | | | | | | | | | | | | | (in millions) | | September 30, 2026 | | December 31, 2025 | | Regulatory liabilities | | | | | | Income tax related items | | $ | 293.5 | | | $ | 305.9 | | | Removal costs | | 227.6 | | | 219.4 | | | Pension and OPEB benefits | | 85.9 | | | 85.7 | | | Energy costs refundable through rate adjustments | | 23.7 | | | 11.4 | | | Derivatives | | 11.3 | | | 8.3 | | | Other, net | | 25.7 | | | 24.1 | | | Total regulatory liabilities | | $ | 667.7 | | | $ | 654.8 | | | | | | | | Balance sheet presentation | | | | | | Amounts refundable to customers | | $ | 23.7 | | | $ | 11.4 | | | Regulatory liabilities | | 644.0 | | | 643.4 | | | Total regulatory liabilities | | $ | 667.7 | | | $ | 654.8 | |
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