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Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of notional volume of natural gas derivatives that is expected to settle or mature each year The following table reflects the notional volume of our natural gas derivatives as of March 31, 2022 that is expected to settle or mature each year:
Year
 Natural Gas Swaps
(MMBTUs)
 (in millions)
202221.6 
202326.8 
202425.3 
202521.2 
202616.0 
20270.9 
Total111.8 
Schedule of fair value of derivative instruments and effect on consolidated balance sheets The table below reflects the fair value of derivative instruments and their effect on our consolidated balance sheets at March 31, 2022 and December 31, 2021.
 Balance Sheet
Location
Fair Value
 20222021
 (dollars in thousands)
Assets:   
Natural gas swapsOther current assets$74,299 $23,596 
Natural gas swapsOther deferred charges$99,647 $40,398 
Liabilities:   
Natural gas swapsOther current liabilities$— $— 
Natural gas swapsOther deferred credits$— $— 
Schedule of the realized gains and (losses) on derivative instruments recognized in margin The following table presents the gross realized gains and (losses) on derivative instruments recognized in net margins for the three months ended March 31, 2022 and 2021.
Statement of
Revenues and
Expenses
Location		Three Months Ended
March 31,
 20222021
 (dollars in thousands)
Natural gas swaps gainsFuel$8,078 $101 
Natural gas swaps lossesFuel(79)(1,244)
Total $7,999 $(1,143)
Schedule of unrealized losses on derivative instruments deferred on the balance sheet The following table presents the unrealized gains on derivative instruments deferred on the balance sheet at March 31, 2022 and December 31, 2021.
Balance Sheet Location20222021
 (dollars in thousands)
Natural gas swapsRegulatory liability$173,946 $63,994 
Total $173,946 $63,994