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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2024
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, 2024 that is expected to settle or mature each year:
Year
 Natural Gas Swaps
(MMBTUs)
 (in millions)
202421.3 
202525.3 
202621.1 
202710.4 
20280.9 
20291.2 
Total80.2 
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, 2024 and December 31, 2023.
 Balance Sheet
Location
Fair Value
 20242023
 (dollars in thousands)
Assets:   
Natural gas swapsPrepayments and other current assets$6,356 $— 
Natural gas swapsOther deferred charges$19,995 $25,459 
Liabilities:   
Natural gas swapsOther current liabilities$3,869 $10,370 
Natural gas swapsOther deferred credits$392 $1,644 
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, 2024 and 2023.
Statement of
Revenues and
Expenses
Location		Three Months Ended
June 30,		Six Months Ended
June 30,
 2024202320242023
 (dollars in thousands)
Natural gas swaps gainsFuel$564 $5 $605 $140 
Natural gas swaps lossesFuel(6,194)(7,207)(14,646)(16,604)
Total $(5,630)$(7,202)$(14,041)$(16,464)
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, 2024 and December 31, 2023.
Balance Sheet Location20242023
 (dollars in thousands)
Natural gas swapsRegulatory liability$22,090 $13,445 
Total $22,090 $13,445