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Related Party Transactions (Tables)
 3 Months Ended
Mar. 31, 2024
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions The table below summarizes the nature and amount of related party transactions of PNMR, PNM, TNMP, and NMRD:
Three Months Ended
March 31,
20242023
(In thousands)
Services billings:
PNMR to PNM$35,407 $31,539 
PNMR to TNMP14,237 12,413 
PNM to TNMP81 65 
TNMP to PNMR10 35 
PNMR to NMRD66 82 
Renewable energy purchases:
PNM from NMRD1,523 2,361 
Interest billings:
PNMR to PNM14 3 
PNM to PNMR155 130 
PNMR to TNMP14 11 
Income tax sharing payments:
PNMR to PNM— — 
TNMP to PNMR— —