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DERIVATIVE INSTRUMENTS (Tables)
 6 Months Ended
Jun. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of derivative assets and liabilities The following table shows our derivative assets and derivative liabilities. None of the derivatives shown below are designated as hedging instruments.
 June 30, 2025December 31, 2024
(in millions)Derivative
Assets		Derivative
Liabilities		Derivative
Assets		Derivative
Liabilities
Current
Natural gas contracts$7.1 $2.3 $5.8 $0.9 
FTRs6.3 — 2.0 — 
Total current 13.4 2.3 7.8 0.9 
Long-term
Natural gas contracts0.1 — 0.3 — 
Total$13.5 $2.3 $8.1 $0.9 
Schedule of estimated notional volumes and realized gains and losses Our estimated notional sales volumes and realized gains and losses were as follows:
Three Months Ended June 30, 2025Three Months Ended June 30, 2024
(in millions)VolumesGainsVolumesGains (Losses)
Natural gas contracts
6.5 Dth
$0.1 
9.7 Dth
$(4.6)
FTRs
1.9 MWh
1.6 
2.1 MWh
0.4 
Total$1.7 $(4.2)
Six Months Ended June 30, 2025Six Months Ended June 30, 2024
(in millions)VolumesGainsVolumesGains (Losses)
Natural gas contracts
18.8 Dth
$0.8 
24.1 Dth
$(12.9)
FTRs
4.2 MWh
2.2 
4.2 MWh
0.3 
Total$3.0 $(12.6)
Schedule of net derivative instruments
The following table shows derivative assets and derivative liabilities if derivative instruments by counterparty were presented net on our balance sheets:
June 30, 2025December 31, 2024
(in millions)Derivative
Assets		Derivative
Liabilities		Derivative
Assets		Derivative
Liabilities
Gross amount recognized on the balance sheet$13.5 $2.3 $8.1 $0.9 
Gross amount not offset on the balance sheet(1.4)
(1)
(1.3)(1.6)
(2)
(0.5)
Net amount$12.1 $1.0 $6.5 $0.4 

(1)    Includes cash collateral received of $0.1 million.
(2)    Includes cash collateral received of $1.1 million.