Derivative and Hedging Instruments (Details-2) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Offsetting Assets [Line Items]
Collateral posted against derivative positions			$ (1,300)
Commodity Derivative Contracts [Member]
Offsetting Assets [Line Items]
Gross amounts		$ 2,966	3,379
Gross amounts offset in balance sheet		(2,966)	(849)
Collateral posted against derivative positions		0	(1,254)
Net amount presented in balance sheet		0	1,276
Commodity Derivative Contracts [Member] | Other Current Assets [Member]
Offsetting Assets [Line Items]
Gross amounts	[1]		$ 2,959
Derivative Asset, Statement of Financial Position [Extensible Enumeration]			Other current assets
Commodity Derivative Contracts [Member] | Other Noncurrent Assets [Member]
Offsetting Assets [Line Items]
Gross amounts	[1]		$ 420
Derivative Asset, Statement of Financial Position [Extensible Enumeration]			Other Assets, Noncurrent
Financial Transmission Rights [Member]
Offsetting Assets [Line Items]
Gross amounts		103	$ 227
Gross amounts offset in balance sheet		0	0
Collateral posted against derivative positions		0	0
Net amount presented in balance sheet		$ 103	$ 227
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other current assets	Other current assets
Financial Transmission Rights [Member] | Other Current Assets [Member]
Offsetting Assets [Line Items]
Gross amounts		$ 103	$ 227

[1] As of December 31, 2021, MGE received collateral of $1.3 million from counterparties under a master netting agreement for outstanding exchange traded derivative positions. The fair value of the derivative asset disclosed in this table has not been reduced for the collateral received.