Derivative and Hedging Instruments (Details-1) $ in Thousands		12 Months Ended
		Dec. 31, 2024 USD ($) Dth1 MWh MW	Dec. 31, 2023 USD ($) Dth1 MWh MW
Commodity Contracts And Financial Transimission Rights [Member]
Derivative Fair Values [Abstract]
Derivative fair value, net		$ 100	$ (5,200)
Commodity Contract [Member]
Notional Disclosures [Abstract]
Notional amount, energy measure (in MWh) | MWh		307,640	392,000
Notional amount, decatherm measure (in Dth) | Dth1		6,285,000	7,180,000
Derivative Fair Values [Abstract]
Asset Derivatives, fair value, gross basis		$ 1,213	$ 419
Liability Derivatives, fair value, gross basis		1,261	5,824
Collateral posted against derivative positions		0	0
Commodity Contract [Member] | Other Current Liabilities [Member]
Derivative Fair Values [Abstract]
Asset Derivatives, fair value, gross basis	[1]	927	263
Liability Derivatives, fair value, gross basis	[1]	1,121	4,942
Commodity Contract [Member] | Other Deferred Liabilities and Other [Member]
Derivative Fair Values [Abstract]
Asset Derivatives, fair value, gross basis	[1]	286	156
Liability Derivatives, fair value, gross basis	[1]	140	882
Commodity Contract [Member] | Cash Flow Hedging [Member]
Derivative Fair Values [Abstract]
Derivative, right to reclaim collateral (receivable)		$ 100	$ 5,400
Financial Transmission Rights [Member]
Notional Disclosures [Abstract]
Notional amount, power measure (in MW) | MW		2,131	1,824
Derivative Fair Values [Abstract]
Asset Derivatives, fair value, gross basis		$ 108	$ 179
Collateral posted against derivative positions		0	0
Financial Transmission Rights [Member] | Other Current Assets [Member]
Derivative Fair Values [Abstract]
Asset Derivatives, fair value, gross basis		108	179
Liability Derivatives, fair value, gross basis		$ 0	$ 0
Energy Related Commodity Contract [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Maximum term of derivative hedging contract		4 years

[1] As of December 31, 2024, and 2023, collateral of less than $0.1 million and $5.4 million, respectively, was posted against and netted with derivative liability positions on the consolidated balance sheets. The fair value of the derivative liability disclosed in this table has not been reduced for the collateral posted.