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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2019
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,
 
2019
 
2018
 
2017
 
 
 
(In thousands)
 
 
Services billings:
 
 
 
 
 
PNMR to PNM
$
96,327

 
$
95,637

 
$
97,914

PNMR to TNMP
36,554

 
33,493

 
31,095

PNM to TNMP
375

 
367

 
382

TNMP to PNMR
141

 
140

 
141

TNMP to PNM
—

 
—

 
154

PNMR to NMRD
238

 
183

 
—

Renewable energy purchases:
 
 
 
 
 
PNM from NMRD
3,124

 
2,924

 
—

Interconnection and facility study billings:
 
 
 
 
 
PNM to NMRD
650

 
2,108

 
—

PNM to PNMR
—

 
68,820

 
—

PNMR to PNM
68,820

 
—

 
—

Interest billings:
 
 
 
 
 
PNMR to PNM
3,365

 
2,585

 
21

PNM to PNMR
299

 
289

 
220

PNMR to TNMP
42

 
136

 
133

Income tax sharing payments:
 
 
 
 
 
PNMR to TNMP
—

 
—

 
—

PNMR to PNM
—

 
—

 
23,391

PNM to PNMR
—

 
134

 
—

TNMP to PNMR
12,996

 
3,424

 
20,686