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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2021
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,
 202120202019
(In thousands)
Services billings:
PNMR to PNM$107,747 $100,872 $96,327 
PNMR to TNMP41,798 39,053 36,554 
PNM to TNMP404 383 375 
TNMP to PNMR141 141 141 
TNMP to PNM— — — 
PNMR to NMRD221 260 238 
Renewable energy purchases:
PNM from NMRD11,879 9,638 3,124 
Interconnection and facility study billings:
PNM to NMRD225 350 650 
PNM to PNMR— — — 
PNMR to PNM— — 68,820 
NMRD to PNM1,276 — — 
Interest billings:
PNMR to PNM31 6 3,365 
PNM to PNMR144 255 299 
PNMR to TNMP— 2 42 
Income tax sharing payments:
PNMR to TNMP— — — 
PNMR to PNM19,492 — — 
PNM to PNMR— — — 
TNMP to PNMR12,842 15,820 12,996