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Derivative and Hedging Instruments (Details-5)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Counterparty
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Counterparty
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Counterparties in net liability position or default [Abstract]          
Derivative, net liability position of counterparties $ 0   $ 0   $ 0
Number of counterparties in default | Counterparty 0   0    
Commodity Contract [Member] | Fuel For Electric Generation Purchased Power [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Realized losses (gains) on income statement $ 4,179 $ (8,698) $ 14,566 $ (14,343)  
Commodity Contract [Member] | Cost Of Gas Sold Expense [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Realized losses (gains) on income statement 0 36 6,451 (800)  
Financial Transmission Rights [Member] | Fuel For Electric Generation Purchased Power [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Realized losses (gains) on income statement (131) 212 (824) 812  
Financial Transmission Rights [Member] | Cost Of Gas Sold Expense [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Realized losses (gains) on income statement $ 0 $ 0 0 0  
Purchased Power Agreement [Member] | Fuel For Electric Generation Purchased Power [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Realized losses (gains) on income statement     0 (2,642)  
Purchased Power Agreement [Member] | Cost Of Gas Sold Expense [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Realized losses (gains) on income statement     $ 0 $ 0