Derivative and Hedging Instruments (Details-1) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2025 USD ($) Dth1 MWh MW	Dec. 31, 2024 USD ($) Dth1 MWh MW
Derivative fair values [Abstract]
Derivative, right to reclaim collateral			$ 100
Commodity Contracts And Financial Transimission Rights [Member]
Derivative fair values [Abstract]
Derivative, Fair Value, Net		$ 700	$ 100
Commodity Contract [Member]
Gross Notional Volume of Open Derivatives [Abstract]
Notional amount, energy measures (in MWh) | MWh		279,520	307,640
Notional amount, decatherm measure (in Dth) | Dth1		6,662,500	6,285,000
Derivative fair values [Abstract]
Derivative Asset, Fair Value, Gross Asset		$ 1,678	$ 1,213
Derivative Liability, Fair Value, Gross Liability		1,239	1,261
Collateral posted against derivative positions		0	0
Derivative, right to reclaim collateral		0	48
Commodity Contract [Member] | Other Current Assets/Liabilities
Derivative fair values [Abstract]
Derivative Asset, Fair Value, Gross Asset	[1]	1,455
Derivative Liability, Fair Value, Gross Liability	[1]	1,192
Commodity Contract [Member] | Other Deferred Charges [Member]
Derivative fair values [Abstract]
Derivative Asset, Fair Value, Gross Asset	[1]	223
Derivative Liability, Fair Value, Gross Liability	[1]	$ 47
Commodity Contract [Member] | Other Current Liabilities [Member]
Derivative fair values [Abstract]
Derivative Asset, Fair Value, Gross Asset	[1]		927
Derivative Liability, Fair Value, Gross Liability	[1]		1,121
Commodity Contract [Member] | Other Deferred Liabilities and Other [Member]
Derivative fair values [Abstract]
Derivative Asset, Fair Value, Gross Asset	[1]		286
Derivative Liability, Fair Value, Gross Liability	[1]		140
Commodity Contract [Member] | Cash Flow Hedging [Member]
Derivative fair values [Abstract]
Derivative, right to reclaim collateral (receivable)			$ 100
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		5,159	2,131
Derivative fair values [Abstract]
Derivative Asset, Fair Value, Gross Asset		$ 258	$ 108
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		258	108
Derivative Liability, Fair Value, Gross Liability		$ 0	$ 0

[1] As of June 30, 2025, no collateral was posted against derivative positions. As of December 31, 2024, collateral of less than $0.1 million 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.