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Derivative Instruments
 3 Months Ended
Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative Instruments Derivative Instruments.    We use commodity derivatives to manage our exposure to fluctuations in the market price of natural gas. Our risk management and compliance committee provides general oversight over all derivative activities. We do not apply hedge accounting to derivative transactions, but instead apply regulated operations accounting. Consistent with our rate-making, unrealized gains or losses on our natural gas swaps are reflected as regulatory assets or liabilities, as appropriate. Realized gains and losses on natural gas swaps are included in fuel expense within our consolidated statements of revenues and expenses and, therefore, net margins within our consolidated statement of cash flows.
We are exposed to credit risk as a result of entering into these arrangements. Credit risk is the potential loss resulting from a counterparty's nonperformance under an agreement. We have established policies and procedures to manage credit risk through counterparty analysis, exposure calculation and monitoring, exposure limits, collateralization and certain other contractual provisions.
It is possible that volatility in commodity prices could cause us to have credit risk exposures with one or more counterparties. If such counterparties fail to perform their obligations, we could suffer a financial loss. However, as of March 31, 2024, all of the counterparties with transaction amounts outstanding under our derivative programs are rated investment grade by the major rating agencies or have provided a guaranty from one of their affiliates that is rated investment grade.
We have entered into International Swaps and Derivatives Association agreements with our natural gas derivative counterparties that mitigate credit exposure by creating contractual rights relating to creditworthiness, collateral, termination and netting (which, in certain cases, allows us to use the net value of affected transactions with the same counterparty in the event of default by the counterparty or early termination of the agreement).
Additionally, we have implemented procedures to monitor the creditworthiness of our counterparties and to evaluate nonperformance in valuing counterparty positions. We have contracted with a third party to assist in monitoring certain of our counterparties' credit standing and condition. Net liability positions are generally not adjusted as we use derivative transactions as hedges and have the ability and intent to perform under each of our contracts. In the instance of net asset positions, we consider general market conditions and the observable financial health and outlook of specific counterparties, forward looking data such as credit default swaps, when available, and historical default probabilities from credit rating agencies in evaluating the potential impact of nonperformance risk to derivative positions.
The contractual agreements contain provisions that could require us or the counterparty to post collateral or credit support. The amount of collateral or credit support that could be required is calculated as the difference between the aggregate fair value of the hedges and pre-established credit thresholds. The credit thresholds are contingent upon each party's credit ratings from the major credit rating agencies. The collateral and credit support requirements vary by contract and by counterparty.
Under the natural gas swap arrangements, we pay the counterparty a fixed price for specified natural gas quantities and receive a payment for such quantities based on a market price index. These payment obligations are netted, such that if the market price index is lower than the fixed price, we will make a net payment, and if the market price index is higher than the fixed price, we will receive a net payment.
At March 31, 2024 and December 31, 2023, the estimated fair values of our natural gas contracts were net assets of approximately $10,381,000 and $13,445,000, respectively.
At March 31, 2024 and December 31, 2023, none of our counterparties was required to post credit collateral under our natural gas swap agreements.
The following table reflects the notional volume of our natural gas derivatives as of March 31, 2024 that is expected to settle or mature each year:
Year
 Natural Gas Swaps
(MMBTUs)
 (in millions)
202429.4 
202525.2 
202620.9 
202710.3 
20280.5 
Total86.3 
The table below reflects the fair value of derivative instruments and their effect on our consolidated balance sheets at March 31, 2024 and December 31, 2023.
 Balance Sheet
Location
Fair Value
 20242023
 (dollars in thousands)
Assets:   
Natural gas swapsOther deferred charges$23,698 $25,459 
Liabilities:   
Natural gas swapsOther current liabilities$12,688 $10,370 
Natural gas swapsOther deferred credits$629 $1,644 
The following table presents the gross realized gains and (losses) on derivative instruments recognized in net margins for the three months ended March 31, 2024 and 2023.
Statement of
Revenues and
Expenses
Location		Three Months Ended March 31,
 20242023
 (dollars in thousands)
Natural gas swaps gainsFuel$41 $135 
Natural gas swaps lossesFuel(8,452)(9,397)
Total $(8,411)$(9,262)
The following table presents the unrealized gains on derivative instruments deferred on the balance sheet at March 31, 2024 and December 31, 2023.
Balance Sheet Location20242023
 (dollars in thousands)
Natural gas swapsRegulatory liability$10,381 $13,445 
Total $10,381 $13,445