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Regulatory and Rate Matters - Energy Efficiency and Load Management (Details) $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 15, 2020 USD ($) MMBTU meter | Jul. 26, 2017 USD ($) GWh | Dec. 31, 2019 USD ($) GWh | Dec. 31, 2018 USD ($) | Nov. 08, 2017 | Nov. 07, 2017
Public Service Company of New Mexico | Energy Efficiency and Load Management Program, Proposed 2018 Portfolio | Disincentives/Incentives Added |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Program costs related to energy efficiency |  |  |  | $ 23.6 |  |
Targeted energy savings (in Gigawatts) | GWh |  | 69 |  |  |  |
Projected earned incentive |  | $ 1.9 | $ 2.7 |  |  |
Energy and load management programs, additional incentive, targeted energy savings (in Gigawatts) | GWh |  |  | 68 |  |  |
Public Service Company of New Mexico | Energy Efficiency and Load Management Program, Proposed 2019 Portfolio | Disincentives/Incentives Added |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Program costs related to energy efficiency |  |  | $ 24.9 |  |  |
Application of incentive based on target savings |  | $ 1.7 | $ 1.8 |  |  |
Public Service Company of New Mexico | 2017 Energy Efficiency and Load Management Program | Disincentives/Incentives Added |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Targeted energy savings (in Gigawatts) | GWh |  |  | 59 |  |  |
Minimum profit incentive |  |  | $ 1.8 |  |  |
Public Service Company of New Mexico | 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 |  |  |  |  |
Public Service Company of New Mexico | 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 |  |  |  |  |
Measurement Input, Discount Rate |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Tax-adjusted WACC |  |  |  |  | 0.0959 | 0.0771

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