Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Services billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	$ 35,407	$ 31,539
Services billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	14,237	12,413
Services billings: | PNM to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	81	65
Services billings: | TNMP to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	10	35
Services billings: | PNMR to NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	66	82
Renewable energy purchases: | PNM from NMRD
Related Party Transaction [Line Items]
Amount of related party transaction	1,523	2,361
Interest billings: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	14	3
Interest billings: | PNMR to TNMP
Related Party Transaction [Line Items]
Amount of related party transaction	14	11
Interest billings: | PNM to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	155	130
Income tax sharing payments: | PNMR to PNM
Related Party Transaction [Line Items]
Amount of related party transaction	0	0
Income tax sharing payments: | TNMP to PNMR
Related Party Transaction [Line Items]
Amount of related party transaction	$ 0	$ 0