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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, 2021 MMBTU MWh | Dec. 31, 2020 MMBTU MWh
Purchase [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MWh | 0 | 1
2022 | MWh | 123 | 0
2023 | MWh | 0 | 0
2024 | MWh | 0 | 0
2025 | MWh | 0 | 0
Purchase [Member] | Physical [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MMBTU | 4,891 | 10,353
2022 | MMBTU | 2,250 | 450
2023 | MMBTU | 0 | 0
2024 | MMBTU | 0 | 0
2025 | MMBTU | 0 | 0
Purchase [Member] | Financial [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MWh | 31 | 224
2022 | MWh | 0 | 0
2023 | MWh | 0 | 0
2024 | MWh | 0 | 0
2025 | MWh | 0 | 0
Purchase [Member] | Financial [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MMBTU | 24,320 | 65,188
2022 | MMBTU | 52,353 | 25,525
2023 | MMBTU | 18,825 | 4,950
2024 | MMBTU | 2,275 | 0
2025 | MMBTU | 0 | 0
Sales [Member] | Physical [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MWh | 18 | 17
2022 | MWh | 216 | 0
2023 | MWh | 0 | 0
2024 | MWh | 0 | 0
2025 | MWh | 0 | 0
Sales [Member] | Physical [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MMBTU | 2,587 | 5,448
2022 | MMBTU | 2,260 | 1,360
2023 | MMBTU | 1,360 | 1,360
2024 | MMBTU | 1,370 | 1,370
2025 | MMBTU | 1,115 | 1,115
Sales [Member] | Financial [Member] | Electric Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MWh | 103 | 451
2022 | MWh | 370 | 0
2023 | MWh | 0 | 0
2024 | MWh | 0 | 0
2025 | MWh | 0 | 0
Sales [Member] | Financial [Member] | Gas Derivative [Member] |  |
Energy Commodity Derivative Volumes [Line Items] |  |
2021 | MMBTU | 13,033 | 39,273
2022 | MMBTU | 28,898 | 12,030
2023 | MMBTU | 7,060 | 900
2024 | MMBTU | 0 | 0
2025 | MMBTU | 0 | 0

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