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Fair Value of Financial Instruments (Details-4) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance, $ 6,779 $ (11,367) $ 178 $ (14,055)
Realized and unrealized gains (losses):        
Included in regulatory assets 0 6,834 0 9,522
Included in regulatory liability 2,180 0 8,780 0
Included in other comprehensive income 0 0 0 0
Included in earnings [1] 6,143 (98) 6,998 210
Included in current assets 45 (180) 118 175
Purchases 4,777 6,377 11,803 12,261
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (10,965) (6,099) (18,918) (12,646)
Ending balance, $ 8,959 $ (4,533) $ 8,959 $ (4,533)
[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.