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Derivatives and Risk Management - Schedule of Energy Commodity Derivative Volumes (Details) MWh in Thousands, MMBTU in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 MMBTU MWh | Dec. 31, 2022 MMBTU MWh
Purchase [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
Year one | MWh | 5 | 5
Year two | MWh | 0 | 0
Year three | MWh | 0 | 0
Year four | MWh | 0 |
Purchase [Member] | Physical [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
Year one | MMBTU | 12,377 | 19,140
Year two | MMBTU | 14,810 | 533
Year three | MMBTU | 6,363 | 450
Year four | MMBTU | 1,660 |
Purchase [Member] | Financial [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
Year one | MWh | 0 | 0
Year two | MWh | 0 | 0
Year three | MWh | 0 | 0
Year four | MWh | 0 |
Purchase [Member] | Financial [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
Year one | MMBTU | 33,810 | 79,253
Year two | MMBTU | 61,090 | 30,658
Year three | MMBTU | 14,130 | 4,895
Year four | MMBTU | 1,800 |
Sales [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
Year one | MWh | 74 | 136
Year two | MWh | 31 | 0
Year three | MWh | 0 | 0
Year four | MWh | 0 |
Sales [Member] | Physical [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
Year one | MMBTU | 735 | 4,145
Year two | MMBTU | 1,370 | 1,370
Year three | MMBTU | 1,115 | 1,115
Year four | MMBTU | 0 |
Sales [Member] | Financial [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
Year one | MWh | 267 | 1,011
Year two | MWh | 400 | 0
Year three | MWh | 96 | 0
Year four | MWh | 0 |
Sales [Member] | Financial [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
Year one | MMBTU | 5,295 | 29,473
Year two | MMBTU | 11,965 | 9,668
Year three | MMBTU | 1,125 | 1,125
Year four | MMBTU | 0 |

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