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Fair Value of Financial Instruments (Details-4) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance, $ (14,055) $ (26,456)
Realized and unrealized gains (losses):    
Included in regulatory assets 2,688 810
Included in other comprehensive income 0 0
Included in earnings [1] 307 (1,453)
Included in current assets 355 247
Purchases 5,884 5,015
Sales 0 0
Issuances 0 0
Settlements (6,546) (3,810)
Ending balance, $ (11,367) $ (25,647)
[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.