v3.25.4
Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2025
Regulatory Assets and Liabilities Disclosure [Abstract]  
Regulatory Assets
Regulatory assets were comprised of the following items:

At December 31, (in millions)
20252024
Regulatory Assets
Unrecognized pension and other postretirement benefit costs (see Note 16)
$433.1 $485.3 
Deferred pension and other postretirement benefit costs (see Note 16)
30.8 45.3 
Environmental costs (see Note 19-D.)
42.0 42.8 
Regulatory effects of accounting for income taxes (see Note 1-N. and Note 15)
190.8 172.0 
Under-recovered gas and fuel costs (see Note 1-J.)
41.3 82.3 
Depreciation218.4 214.9 
Post-in-service carrying charges287.2 280.8 
Safety activity costs200.6 203.7 
DSM programs13.4 17.8 
Retired coal generating stations552.1 617.0 
Losses on commodity price risk programs (See Note 13)
10.1 6.5 
Deferred property taxes79.4 75.9 
Renewable energy investments
130.7 81.3 
WAM system filing
33.5 21.5 
Customer assistance programs
17.3 24.4 
Uncollected future cost of removal
102.5 — 
Other116.2 105.8 
Total Regulatory Assets$2,499.4 $2,477.3 
Less: Current Portion274.2 319.9 
Total Noncurrent Regulatory Assets$2,225.2 $2,157.4 
Regulatory Liabilities
Regulatory liabilities were comprised of the following items:
At December 31, (in millions)
20252024
Regulatory Liabilities
Over-recovered gas and fuel costs (see Note 1-J.)
$50.6 $21.4 
Cost of removal (see Note 11)
454.5 482.8 
Regulatory effects of accounting for income taxes (see Note 1-N. and Note 15)
869.3 827.0 
Deferred pension and other postretirement benefit costs (see Note 16)
28.0 40.4 
Gains on commodity price risk programs (See Note 13)
19.2 28.7 
Customer assistance programs
10.6 9.4 
Off-system sales sharing
21.8 21.4 
Renewable energy investments (See Note 1-S. and Note 4)
139.4 77.0 
Rate refunds
68.9 16.6 
Other111.1 57.0 
Total Regulatory Liabilities$1,773.4 $1,581.7 
Less: Current Portion260.1 150.5 
Total Noncurrent Regulatory Liabilities$1,513.3 $1,431.2