| 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 | | | | | | Environmental remediation costs | | $ | 128.9 | | | $ | 133.5 | | | Plant retirement related items | | 113.3 | | | 122.9 | | | Income tax related items | | 61.6 | | | 59.3 | | | AROs | | 60.7 | | | 49.1 | | | Electric transmission costs | | 23.8 | | | 15.4 | | | Pension and OPEB costs | | 12.0 | | | 19.8 | | | Finance and operating leases | | 11.8 | | | 10.2 | | | Derivatives | | 7.8 | | | 4.8 | | | Bluewater Natural Gas Holding, LLC | | 6.6 | | | 8.7 | | | Other, net | | 23.0 | | | 22.5 | | | Total regulatory assets | | $ | 449.5 | | | $ | 446.2 | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | (in millions) | | June 30, 2026 | | December 31, 2025 | | Regulatory liabilities | | | | | | Income tax related items | | $ | 298.7 | | | $ | 305.9 | | | Removal costs | | 226.7 | | | 219.4 | | | Pension and OPEB benefits | | 85.9 | | | 85.7 | | | Energy costs refundable through rate adjustments | | 18.4 | | | 11.4 | | | Derivatives | | 16.8 | | | 8.3 | | | Other, net | | 23.3 | | | 24.1 | | | Total regulatory liabilities | | $ | 669.8 | | | $ | 654.8 | | | | | | | | Balance sheet presentation | | | | | | Other current liabilities | | $ | 18.4 | | | $ | 11.4 | | | Regulatory liabilities | | 651.4 | | | 643.4 | | | Total regulatory liabilities | | $ | 669.8 | | | $ | 654.8 | |
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