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Financing - Short-term Debt and Liquidity (Details)			12 Months Ended
	May 20, 2022 extension_option	Mar. 11, 2022 USD ($) extension_option	Dec. 31, 2017 USD ($) utility	Oct. 21, 2022 USD ($)	Sep. 30, 2022 USD ($)	May 13, 2022 USD ($)	Mar. 10, 2022 USD ($)	Dec. 31, 2021 USD ($)	May 18, 2021 USD ($)	Mar. 23, 2021
Short-term Debt [Line Items]
Financing capacity									$ 40,000,000
Letters of credit outstanding					$ 3,400,000
Notes payable, related parties					6,400,000			$ 6,400,000
Variable Rate Short-Term Debt
Short-term Debt [Line Items]
Term of derivatives			4 years
Aggregate principal amount			$ 50,000,000
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			0
PNM | Lines of credit
Short-term Debt [Line Items]
NMPRC approved credit facility					40,000,000
TNMP
Short-term Debt [Line Items]
Letters of credit outstanding					$ 0
TNMP | TNMP Revolving Credit Facility
Short-term Debt [Line Items]
Line of credit facility, interest rate at period end					3.97%
PNMR Development
Short-term Debt [Line Items]
Notes payable, related parties					$ 0			$ 0
PNMR Development | PNMR Revolving Credit Facility
Short-term Debt [Line Items]
Line of credit facility, interest rate at period end					4.47%
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
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
Revolving credit facility | TNMP | First mortgage bonds
Short-term Debt [Line Items]
Collateral amount					$ 75,000,000	$ 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
Interest rate contract
Short-term Debt [Line Items]
Number of derivatives | utility			3
Interest rate 1 | Variable Rate Short-Term Debt
Short-term Debt [Line Items]
Fixed interest rate			1.926%							1.926%
Interest rate 2 | Variable Rate Short-Term Debt
Short-term Debt [Line Items]
Fixed interest rate			1.823%
Interest rate 3 | Variable Rate Short-Term Debt
Short-term Debt [Line Items]
Fixed interest rate			1.629%
Subsequent event
Short-term Debt [Line Items]
Notes payable, related parties				$ 6,400,000
Remaining borrowing capacity				777,700,000
Subsequent event | PNMR
Short-term Debt [Line Items]
Remaining borrowing capacity				241,200,000
Consolidated invested cash				900,000
Subsequent event | PNM
Short-term Debt [Line Items]
Notes payable, related parties				0
Remaining borrowing capacity				400,000,000
Consolidated invested cash				14,900,000
Subsequent event | PNM | PNM 2017 New Mexico Credit Facility
Short-term Debt [Line Items]
Remaining borrowing capacity				40,000,000
Subsequent event | TNMP
Short-term Debt [Line Items]
Notes payable, related parties				0
Remaining borrowing capacity				96,500,000
Consolidated invested cash				$ 0

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