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Regulatory and Rate Matters - Four Corners Abandonment Application (Details) - Four Corners - Public Service Company of New Mexico - USD ($) $ in Millions |  |  | 1 Months Ended
--- | --- | --- | ---
Jan. 08, 2021 | Nov. 01, 2020 | Nov. 30, 2020
Public Utilities, General Disclosures [Line Items] |  |  |
Payments for relief from obligations |  | $ 75.0 | $ 15.0
Final payment for relief from obligations |  |  | 60.0
Initial payment for relief from obligations |  |  | $ 15.0
Request issuance of energy transition bonds | $ 300.0 |  |
Forecasted undepreciated investment | 272.0 |  |
Plant decommissioning and coal mine reclamation costs | 4.6 |  |
Upfront financing costs | 7.3 |  |
Proceeds from securitization bonds | $ 16.5 |  |
Public Service Company of New Mexico |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  | 13.00% |

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