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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2020
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,
 202020192018
(In thousands)
Services billings:
PNMR to PNM$100,872 $96,327 $95,637 
PNMR to TNMP39,053 36,554 33,493 
PNM to TNMP383 375 367 
TNMP to PNMR141 141 140 
TNMP to PNM— — — 
PNMR to NMRD260 238 183 
Renewable energy purchases:
PNM from NMRD9,638 3,124 2,924 
Interconnection and facility study billings:
PNM to NMRD350 650 2,108 
PNM to PNMR— — 68,820 
PNMR to PNM— 68,820 — 
Interest billings:
PNMR to PNM6 3,365 2,585 
PNM to PNMR255 299 289 
PNMR to TNMP2 42 136 
Income tax sharing payments:
PNMR to TNMP— — — 
PNMR to PNM— — — 
PNM to PNMR— — 134 
TNMP to PNMR15,820 12,996 3,424