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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2018
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,
 
2018
 
2017
 
2016
 
 
 
(In thousands)
 
 
Services billings:
 
 
 
 
 
PNMR to PNM
$
95,637

 
$
97,914

 
$
94,606

PNMR to TNMP
33,493

 
31,095

 
28,907

PNM to TNMP
367

 
382

 
427

TNMP to PNMR
140

 
141

 
66

TNMP to PNM
—

 
154

 
172

PNMR to NMRD
183

 
—

 
—

Renewable energy purchases:
 
 
 
 
 
PNM from NMRD
2,924

 
—

 
—

Interconnection and facility study billings:
 
 
 
 
 
PNM to NMRD
2,108

 
—

 
—

PNM to PNMR
68,820

 
—

 
—

Interest billings:
 
 
 
 
 
PNMR to PNM
2,585

 
21

 
11

PNM to PNMR
289

 
220

 
150

PNMR to TNMP
136

 
133

 
132

Income tax sharing payments:
 
 
 
 
 
PNMR to TNMP
—

 
—

 
—

PNMR to PNM
—

 
23,391

 
—

PNM to PNMR
134

 
—

 
—

TNMP to PNMR
3,424

 
20,686

 
—