v3.26.1
Derivative and Hedging Instruments (Details-1)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
Dth1
MWh
MW
Dec. 31, 2025
USD ($)
Dth1
MWh
MW
Derivative fair values [Abstract]    
Derivative, right to reclaim collateral $ 100 $ 1,800
Commodity Contracts And Financial Transimission Rights [Member]    
Derivative fair values [Abstract]    
Derivative, Fair Value, Net $ (100) $ 1,400
Commodity Contract [Member]    
Gross Notional Volume of Open Derivatives [Abstract]    
Notional amount, energy measures (in MWh) | MWh 195,040 224,360
Notional amount, decatherm measure (in Dth) | Dth1 4,792,500 8,230,000
Derivative fair values [Abstract]    
Derivative Asset, Fair Value, Gross Asset $ 1,253 $ 814
Derivative Liability, Fair Value, Gross Liability 1,287 2,565
Collateral posted against derivative positions 0 0
Derivative, right to reclaim collateral 34 1,751
Commodity Contract [Member] | Other Current Liabilities [Member]    
Derivative fair values [Abstract]    
Derivative Asset, Fair Value, Gross Asset [1] 1,109 448
Derivative Liability, Fair Value, Gross Liability [1] 1,213 2,380
Commodity Contract [Member] | Other Deferred Liabilities and Other [Member]    
Derivative fair values [Abstract]    
Derivative Asset, Fair Value, Gross Asset [1] 144 366
Derivative Liability, Fair Value, Gross Liability [1] 74 185
Commodity Contract [Member] | Cash Flow Hedging [Member]    
Derivative fair values [Abstract]    
Derivative, right to reclaim collateral (receivable) $ 100 $ 1,800
Energy Related Commodity Contract [Member] | Cash Flow Hedging [Member]    
Derivatives, Fair Value [Line Items]    
Maximum term of derivative hedging contract 4 years  
Financial Transmission Rights [Member]    
Gross Notional Volume of Open Derivatives [Abstract]    
Notional amount, power measure (in MW) | MW 927 2,413
Derivative fair values [Abstract]    
Derivative Asset, Fair Value, Gross Asset $ 109 $ 337
Collateral posted against derivative positions 0 0
Financial Transmission Rights [Member] | Other Current Assets/Liabilities    
Derivative fair values [Abstract]    
Derivative Asset, Fair Value, Gross Asset 109 337
Derivative Liability, Fair Value, Gross Liability $ 0 $ 0
[1] As of March 31, 2026, and December 31, 2025, collateral of less than $0.1 million and $1.8 million, respectively, was posted against and netted with derivative liability positions. The fair value of the derivatives disclosed in this table has not been adjusted for the collateral posted.