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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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