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Regulatory and Rate Matters - SJGS Abandonment Application (Details) - San Juan Generating Station - Public Service Company of New Mexico $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 01, 2019 USD ($) scenario MW | Dec. 31, 2019 USD ($) | Feb. 21, 2020 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |
Number of megawatts in natural gas-fired peaking plant (in megawatts) | MW | 280 |  |
Number of megawatts in battery storage facilities (in megawatts) | MW | 70 |  |
Solar distributed generation (in mw) | MW | 350 |  |
Number of megawatts in battery storage facilities, replacement resource scenario (in megawatts) | MW | 60 |  |
Number of replacement resource scenarios | scenario | 3 |  |
Request issuance of energy transition bonds | $ 361.0 | $ 361.0 |
Forecasted undepreciated investment | 283.0 |  |
Plant decommissioning and coal mine reclamation costs | 28.6 |  |
Upfront financing costs | 9.6 |  |
Severance costs | 20.0 |  |
Proceeds from securitization bonds | $ 19.8 |  |
Subsequent Event | Forecast |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Forecasted undepreciated investment |  |  | $ 361.0

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