Derivative Instruments - Schedule of Derivative Instruments as Recorded in Consolidated Balance Sheets (Details) - AT DEC. 31, - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
GROSS ASSET (LIABILITY)
Derivative asset (liability), net	$ (3,870)	$ 11,038
FTRs \| Energy risk management assets
GROSS ASSET (LIABILITY)
Derivative asset	5,513	2,084
FTRs \| Energy risk management liabilities
GROSS ASSET (LIABILITY)
Derivative liability	(945)	(256)
Natural gas derivatives \| Energy risk management assets
GROSS ASSET (LIABILITY)
Derivative asset	2,452	9,210
Natural gas derivatives \| Energy risk management liabilities
GROSS ASSET (LIABILITY)
Derivative liability	$ (10,890)	$ 0

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References + Details