Schedule I - Condensed Parent Company Finanical Statements (Details-Notes 1) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
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]	78,815	$ 143,815
Line of credit	[1],[2]	$ 150,000	$ 150,000

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

[2] In November 2022, MGE Energy and MGE amended and restated their existing credit agreements, which extended their maturity dates to November 8, 2027. In January 2023, MGE amended one of its existing credit agreements to increase the available credit by an additional $30 million. As of December 31, 2022, MGE Energy and MGE had no borrowings outstanding under these credit facilities and were in compliance with the covenant requirements of the credit agreements.