Schedule I - Condensed Parent Company Finanical Statements (Details-Notes 1) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Line of credit, borrowings outstanding		$ 0
MGE Energy unsecured committed revolving line of credit totaling $50 million [Member] | MGE Energy [Member]
Line of Credit Facility [Line Items]
Line of credit		50,000
Line of credit, borrowings outstanding		0
Line of Credit [Member]
Line of Credit Facility [Line Items]
Available capacity under line of credit	[1]	141,315	$ 78,815
Line of credit	[1],[2]	$ 180,000	$ 150,000

[1] MGE Energy short-term borrowings include MGE Energy and MGE lines of credit and MGE commercial paper.

[2] As of December 31, 2023, MGE Energy and MGE had no borrowings outstanding under these credit facilities and were in compliance with the covenant requirements of the credit agreements.