Derivative and Hedging Instruments (Details-2) - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024
Offsetting Assets [Line Items]
Collateral posted against derivative positions		$ (2,000)
Commodity Contract [Member]
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Gross Asset		2,297	$ 1,213
Gross amounts offset in balance sheet		(2,297)	(1,213)
Collateral posted against derivative positions		0	0
Net amount presented in balance sheet		0	0
Commodity Contract [Member] | Other Current Assets [Member]
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	$ 1,995
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Assets, Current
Commodity Contract [Member] | Other Noncurrent Assets [Member]
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	$ 302
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Assets, Noncurrent
Financial Transmission Rights [Member]
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Gross Asset			108
Gross amounts offset in balance sheet			0
Collateral posted against derivative positions			0
Net amount presented in balance sheet			$ 108
Derivative Asset, Statement of Financial Position [Extensible Enumeration]			Other Assets, Current
Financial Transmission Rights [Member] | Other Current Assets [Member]
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Gross Asset			$ 108

[1] As of March 31, 2025, MGE received collateral of $2.0 million from counterparties under a master netting agreement for outstanding exchange traded derivative positions on the consolidated balance sheets. 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.