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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2023
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 June 30, 2023 that is expected to settle or mature each year:
Year
 Natural Gas Swaps
(MMBTUs)
 (in millions)
202319.8 
202430.5 
202525.0 
202620.3 
20277.7 
Total103.3 
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 June 30, 2023 and December 31, 2022.
 Balance Sheet
Location
Fair Value
 20232022
 (dollars in thousands)
Assets:   
Natural gas swapsOther current assets$9,688 $35,285 
Natural gas swapsOther deferred charges$44,681 $99,725 
Liabilities:   
Natural gas swapsOther current liabilities$5,115 $3,206 
Natural gas swapsOther deferred credits$19 $— 
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 and six months ended June 30, 2023 and 2022.
Statement of
Revenues and
Expenses
Location		Three Months Ended June 30,Six Months Ended
June 30,
 2023202220232022
 (dollars in thousands)
Natural gas swaps gainsFuel$5 $42,563 $140 $50,641 
Natural gas swaps lossesFuel(7,207)(203)(16,604)(282)
Total $(7,202)$42,360 $(16,464)$50,359 
Schedule of unrealized gains on derivative instruments deferred on the balance sheet The following table presents the unrealized gains on derivative instruments deferred on the balance sheet at June 30, 2023 and December 31, 2022.
Balance Sheet Location20232022
 (dollars in thousands)
Natural gas swapsRegulatory liability$49,235 $131,804 
Total $49,235 $131,804