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Derivative Instruments (Details) - Bear Valley Electric Service, Inc. $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) MWh | Dec. 31, 2020 USD ($)
Derivative instruments |  |
Derivative Activity Volume | MWh | 350,000 |
Changes in the fair value of the derivative |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | $ 4,400 |
Purchase power contract |  |
Changes in the fair value of the derivative |  |
Balance, at beginning of the period | 1,537 | $ 3,171
Unrealized gain on purchased power contracts | 5,978 | 1,634
Balance, at end of the period | $ 4,441 | $ 1,537
Minimum |  |
Derivative instruments |  |
Derivative, Term of Contract | 3 years |
Minimum | Purchase power contract |  |
Derivative instruments |  |
Derivative, Term of Contract | 3 years |
Maximum |  |
Derivative instruments |  |
Derivative, Term of Contract | 5 years |
Maximum | Purchase power contract |  |
Derivative instruments |  |
Derivative, Term of Contract | 5 years |

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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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