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Financing - Schedule of Short-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Short-term Debt [Line Items]
Short-term debt	$ 405,500	$ 232,000
PNM
Short-term Debt [Line Items]
Short-term debt	166,900	185,900
Texas-New Mexico Power Company
Short-term Debt [Line Items]
Short-term debt	39,800	36,700
PNM Revolving Credit Facility | PNM
Short-term Debt [Line Items]
Short-term debt	$ 126,900	$ 145,900
Line of credit facility, interest rate at period end	6.68%	5.67%
PNM New Mexico Credit Facility | PNM
Short-term Debt [Line Items]
Short-term debt	$ 40,000	$ 40,000
Line of credit facility, interest rate at period end	6.67%	5.68%
TNMP Revolving Credit Facility | Texas-New Mexico Power Company
Short-term Debt [Line Items]
Short-term debt	$ 39,800	$ 36,700
Line of credit facility, interest rate at period end	6.29%	5.29%
PNMR Revolving Credit Facility | PNMR Development
Short-term Debt [Line Items]
Short-term debt	$ 198,800	$ 9,400
Line of credit facility, interest rate at period end	6.92%	5.90%

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