Financing - Schedule of Short-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Short-term Debt [Line Items]
Short-term debt	$ 60,200	$ 62,700
PNM
Short-term Debt [Line Items]
Short-term debt	0	7,400
Texas-New Mexico Power Company
Short-term Debt [Line Items]
Short-term debt	3,000	400
PNM Revolving Credit Facility | PNM
Short-term Debt [Line Items]
Short-term debt	0	7,400
TNMP Revolving Credit Facility | Texas-New Mexico Power Company
Short-term Debt [Line Items]
Short-term debt	3,000	400
PNMR Revolving Credit Facility
Short-term Debt [Line Items]
Short-term debt	$ 57,200	$ 54,900