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Fair Value of Financial Instruments (Details-4) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance, $ 8,959 $ (4,533) $ 178 $ (14,055)
Realized and unrealized gains (losses):        
Included in regulatory liability (5,105) 8,122 3,675 17,644
Included in other comprehensive income 0 0 0 0
Included in earnings [1] 6,609 2,476 13,607 2,686
Included in current assets (73) 0 45 175
Purchases 108 6,638 11,911 18,899
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (6,644) (9,114) (25,562) (21,760)
Ending balance, $ 3,854 $ 3,589 $ 3,854 $ 3,589
[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.