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Regulatory and Rate Matters - Renewable Portfolio Standard (Details) |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 03, 2019 MW | Dec. 31, 2019 USD ($) MW | Jun. 14, 2019 | May 01, 2019 kv | Aug. 10, 2018 kv MW | Jun. 01, 2017 GWh MW
KV Transmission Line |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Solar distributed generation (in mw) | 140 |  |  |  | 166 |
PPA term | 20 years |  |  |  |  |
Transmission line and associated facilities | kv |  |  |  | 345 | 345 |
Public Service Company of New Mexico | Renewable Portfolio Standard |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Solar photovoltaic capacity (in mw) |  | 157 |  |  |  |
Current output of solar photovoltaic capacity (in mw) |  | 15 |  |  |  |
Solar distributed generation (in mw) |  | 127.6 |  |  |  |
Requested solar production (in mw) |  | 50 |  |  |  |
Public Service Company of New Mexico | Renewable Portfolio Standard | Maximum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Reasonable cost threshold in megawatts per hour | $ |  | $ 60 |  |  |  |
Public Service Company of New Mexico | Renewable Portfolio Standard | Required Percentage by 2011 |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Required percentage of renewable energy in portfolio to electric sales |  | 10.00% |  |  |  |
Public Service Company of New Mexico | Renewable Portfolio Standard | Required Percentage by 2015 |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Required percentage of renewable energy in portfolio to electric sales |  | 15.00% |  |  |  |
Public Service Company of New Mexico | Renewable Portfolio Standard | Required Percentage by 2020 |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Required percentage of renewable energy in portfolio to electric sales |  | 20.00% |  |  |  |
NMPRC | Public Service Company of New Mexico |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Additional megawatt hours in first year (in mw) | GWh |  |  |  |  |  | 80
Requested solar production (in mw) |  |  |  |  |  | 50
New Mexico Wind | Public Service Company of New Mexico | Renewable Portfolio Standard 2014 |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Wind energy capacity (in mw) |  | 204 |  |  |  |
New Mexico Wind | NMPRC | Public Service Company of New Mexico |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Additional megawatt hours in second year (in mw) | GWh |  |  |  |  |  | 105
Red Mesa Wind | Public Service Company of New Mexico | Renewable Portfolio Standard 2014 |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Wind energy capacity (in mw) |  | 102 |  |  |  |
Lightning Dock Geothermal | NMPRC | Public Service Company of New Mexico |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Additional megawatt hours in first year (in mw) | GWh |  |  |  |  |  | 55
Additional megawatt hours in second year (in mw) | GWh |  |  |  |  |  | 77
La Joya Wind | KV Transmission Line |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Solar distributed generation (in mw) |  |  |  |  | 140 |
Energy Transition Act | Electric-Generation Portfolio Standard | Required Percentage by 2020 |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Renewable energy, percentage |  |  | 0.20 |  |  |
Energy Transition Act | Electric-Generation Portfolio Standard | Required Percentage by 2025 |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Renewable energy, percentage |  |  | 0.40 |  |  |
Energy Transition Act | Electric-Generation Portfolio Standard | Required Percentage by 2030 |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Renewable energy, percentage |  |  | 0.50 |  |  |
Energy Transition Act | Electric-Generation Portfolio Standard | Required Percentage by 2040 |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Renewable energy, percentage |  |  | 0.80 |  |  |
Energy Transition Act | Electric-Generation Portfolio Standard | Required Percentage by 2045 |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Renewable energy, percentage |  |  | 1 |  |  |

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