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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2022
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,
 202220212020
(In thousands)
Services billings:
PNMR to PNM$115,415 $107,747 $100,872 
PNMR to TNMP42,293 41,798 39,053 
PNM to TNMP411 404 383 
TNMP to PNMR141 141 141 
TNMP to PNM— — — 
PNMR to NMRD308 221 260 
Renewable energy purchases:
PNM from NMRD11,795 11,879 9,638 
Interconnection and facility study billings:
PNM to NMRD— 225 350 
PNM to PNMR— — — 
PNMR to PNM— — — 
NMRD to PNM— 1,276 — 
Interest billings:
PNMR to PNM13 31 6 
PNM to PNMR249 144 255 
PNMR to TNMP166 — 2 
Income tax sharing payments:
PNMR to TNMP— — — 
PNMR to PNM— 19,492 — 
PNM to PNMR11,602 — — 
TNMP to PNMR8,341 12,842 15,820