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Financing - Short-term Debt and Liquidity (Details)	Jan. 26, 2023 USD ($) extension_option	May 20, 2022 USD ($) extension_option	Mar. 11, 2022 USD ($) extension_option	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 05, 2022 USD ($)	May 13, 2022 USD ($)	Mar. 10, 2022 USD ($)
Short-term Debt [Line Items]
Letters of credit outstanding				$ 3,100,000
PNMR Development
Short-term Debt [Line Items]
Notes payable				0	$ 5,300,000
Revolving credit facility | PNM 2022 Delayed-Draw Term Loan | Line of credit
Short-term Debt [Line Items]
Financing capacity				225,000,000		$ 225,000,000
PNMR Revolving Credit Facility
Short-term Debt [Line Items]
Financing capacity	$ 285,000,000
PNMR Revolving Credit Facility | WEB LOC Facility
Short-term Debt [Line Items]
Letters of credit outstanding				30,300,000
PNM
Short-term Debt [Line Items]
Letters of credit outstanding				0
PNM | PNMR
Short-term Debt [Line Items]
Notes payable				$ 0
PNM | Lines of credit
Short-term Debt [Line Items]
NMPRC approved credit facility		$ 40,000,000
PNM | PNM Revolving Credit Facility
Short-term Debt [Line Items]
Financing capacity	$ 380,000,000
Line of credit facility, interest rate at period end				6.68%	5.67%
PNM | PNM New Mexico Credit Facility
Short-term Debt [Line Items]
Line of credit facility, interest rate at period end				6.67%	5.68%
TNMP
Short-term Debt [Line Items]
Letters of credit outstanding				$ 0
TNMP | PNMR
Short-term Debt [Line Items]
Notes payable				$ 0
TNMP | TNMP Revolving Credit Facility
Short-term Debt [Line Items]
Line of credit facility, interest rate at period end				6.29%	5.29%
PNMR Development | PNMR
Short-term Debt [Line Items]
Notes payable				$ 100,000
PNMR Development | PNMR Revolving Credit Facility
Short-term Debt [Line Items]
Line of credit facility, interest rate at period end				6.92%	5.90%
Revolving credit facility
Short-term Debt [Line Items]
Financing capacity				$ 300,000,000
Number of extensions | extension_option		2
Extension period		1 year
Revolving credit facility | PNM
Short-term Debt [Line Items]
Financing capacity				400,000,000
Number of extensions exercised | extension_option	1
Extension period exercised	1 year
Revolving credit facility | TNMP
Short-term Debt [Line Items]
Financing capacity			$ 100,000,000				$ 100,000,000	$ 75,000,000
Number of extensions | extension_option			2
Extension period	1 year		1 year
Number of extensions exercised | extension_option	1
Extension period exercised	1 year
Revolving credit facility | TNMP | First mortgage bonds
Short-term Debt [Line Items]
Collateral amount							$ 100,000,000
TNMP Revolving Credit Facility | TNMP
Short-term Debt [Line Items]
Financing capacity			$ 75,000,000
TNMP Revolving Credit Facility | TNMP | First mortgage bonds
Short-term Debt [Line Items]
Collateral amount			$ 75,000,000
Senior Unsecured Noted, Pollution Control Revenue Bonds | PNM | Pollution Control Rvenue Bonds, Due June Twenty Twenty Four
Short-term Debt [Line Items]
Financing capacity				198,000,000
Senior Unsecured Noted, Pollution Control Revenue Bonds | TNMP | FMB Notes Due July 2024
Short-term Debt [Line Items]
Financing capacity				$ 80,000,000

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