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Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2023
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions The table below summarizes the nature and amount of related party transactions of PNMR, PNM and TNMP:     
 Year Ended December 31,
 202320222021
(In thousands)
Services billings:
PNMR to PNM$124,321 $115,415 $107,747 
PNMR to TNMP47,470 42,293 41,798 
PNM to TNMP349 411 404 
TNMP to PNMR141 141 141 
PNMR to NMRD333 308 221 
Renewable energy purchases:
PNM from NMRD12,717 11,795 11,879 
Interconnection and facility study billings:
PNM to NMRD— — 225 
NMRD to PNM— — 1,276 
Interest billings:
PNMR to PNM23 13 31 
PNM to PNMR582 249 144 
PNMR to TNMP129 166 — 
Income tax sharing payments:
PNMR to PNM5,338 — 19,492 
PNM to PNMR— 11,602 — 
TNMP to PNMR15,749 8,341 12,842