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Regulatory and Rate Matters - Energy Efficiency and Load Management (Details) - Public Service Company of New Mexico $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 15, 2021 USD ($) GWh | Apr. 15, 2020 USD ($) MMBTU meter | Dec. 31, 2019 USD ($) GWh
Energy Efficiency and Load Management Program, Proposed 2018 Portfolio | Disincentives/Incentives Added |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Energy and load management programs, additional incentive, targeted energy savings (in Gigawatts) | GWh |  |  | 68
2017 Energy Efficiency and Load Management Program | Disincentives/Incentives Added |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Minimum profit incentive |  |  | $ 1.8
Targeted energy savings (in Gigawatts) | GWh |  |  | 59
Energy Efficiency and Load Management Program |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Program costs related to energy efficiency, next fiscal year |  | $ 31.4 |
Program costs related to energy efficiency, in year two |  | 31.0 |
Program costs related to energy efficiency, in year three |  | $ 29.6 |
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU |  | 80 |
Number of AMI meters to be installed | meter |  | 5,000 |
Program costs related to meter installation |  | $ 2.9 |
2020 Energy Efficiency Annual Report | Disincentives and Incentives Added |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Energy efficiency and load management programs profit incentive | $ 0.8 |  |
Energy efficiency and load management programs additional incentive targeted energy savings (in Gigawatts) | GWh | 87 |  |
Minimum | Renewable Portfolio Standard |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Sliding scale profit incentive |  |  | 7.10%
Profit incentive sliding scale multiplier |  | 0.071 |
Energy efficiency and load management programs targeted energy savings (in Gigawatts) | MMBTU |  | 80 |

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