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Fair Value of Financial Instruments (Details-4) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance, $ 178 $ (14,055)
Realized and unrealized gains (losses):    
Included in regulatory assets 0 2,688
Included in regulatory liability 6,600 0
Included in other comprehensive income 0 0
Included in earnings [1] 855 307
Included in current assets 73 355
Purchases 7,026 5,884
Sales 0 0
Issuances 0 0
Settlements (7,953) (6,546)
Ending balance, $ 6,779 $ (11,367)
[1] MGE's exchange-traded derivative contracts, over-the-counter party transactions, purchased power agreement, and FTRs are subject to regulatory deferral. These derivatives are therefore marked to fair value and are offset in the financial statements with a corresponding regulatory asset or liability.