v3.26.3
REGULATORY ASSETS AND LIABILITIES (Tables)
 9 Months Ended
Sep. 30, 2026
Regulatory Assets and Liabilities Disclosure [Abstract]  
Schedule of regulatory assets
(in millions)September 30, 2026December 31, 2025
Regulatory assets
Environmental remediation costs$126.6 $133.5 
Plant retirement related items110.0 122.9 
AROs66.4 49.1 
Income tax related items62.9 59.3 
Electric transmission costs29.0 15.4 
Finance and operating leases12.5 10.2 
Derivatives11.0 4.8 
Revenue requirements of generation facilities (1)
8.3 0.6 
Pension and OPEB costs8.0 19.8 
Bluewater Natural Gas Holding, LLC5.0 8.7 
Other, net14.9 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.
Schedule of regulatory liabilities
(in millions)September 30, 2026December 31, 2025
Regulatory liabilities
Income tax related items$293.5 $305.9 
Removal costs 227.6 219.4 
Pension and OPEB benefits85.9 85.7 
Energy costs refundable through rate adjustments23.7 11.4 
Derivatives11.3 8.3 
Other, net25.7 24.1 
Total regulatory liabilities$667.7 $654.8 
Balance sheet presentation
Amounts refundable to customers$23.7 $11.4 
Regulatory liabilities644.0 643.4 
Total regulatory liabilities$667.7 $654.8