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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 ($) extension_option	Mar. 31, 2023 USD ($)	Dec. 31, 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, related parties				0	$ 5,300,000
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
Notes payable, related parties				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
TNMP
Short-term Debt [Line Items]
Letters of credit outstanding				0
Notes payable, related parties				$ 14,200,000
TNMP | PNM Revolving Credit Facility
Short-term Debt [Line Items]
Line of credit facility, interest rate at period end				6.14%
TNMP | PNM New Mexico Credit Facility
Short-term Debt [Line Items]
Line of credit facility, interest rate at period end				6.11%
TNMP | TNMP Revolving Credit Facility
Short-term Debt [Line Items]
Line of credit facility, interest rate at period end				5.71%
PNMR Development
Short-term Debt [Line Items]
Notes payable, related parties				$ 6,200,000
PNMR Development | PNMR Revolving Credit Facility
Short-term Debt [Line Items]
Line of credit facility, interest rate at period end				6.38%
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
Senior Notes | PNM
Short-term Debt [Line Items]
Financing capacity							55,000,000
Senior Unsecured Noted, Pollution Control Revenue Bonds | PNM | Pollution Control Revenue Bonds, Due June Twenty Twenty Three
Short-term Debt [Line Items]
Unsecured long-term debt, noncurrent							$ 130,000,000
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

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