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Related Party Transactions (Tables)
3 Months Ended
Mar. 31, 2025
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions The table below summarizes the nature and amount of related party transactions of TXNM, PNM, TNMP, and NMRD:
Three Months Ended
March 31,
20252024
(In thousands)
Services billings:
TXNM to PNM
$32,087 $35,407 
TXNM to TNMP
13,376 14,237 
PNM to TNMP79 81 
TNMP to TXNM
28 10 
TXNM to NMRD
— 66 
Renewable energy purchases:
PNM from NMRD— 1,523 
Interest billings:
TXNM to PNM
14 
PNM to TXNM
133 155 
TXNM to TNMP
145 14