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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 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, TNMP, and NMRD:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
Services billings:
 
 
 
 
 
 
 
PNMR to PNM
$
22,471

 
$
23,190

 
$
46,150

 
$
47,593

PNMR to TNMP
8,058

 
7,806

 
16,423

 
15,943

PNM to TNMP
90

 
102

 
177

 
187

TNMP to PNMR
35

 
35

 
70

 
70

TNMP to PNM
—

 
57

 
—

 
145

PNMR to NMRD
51

 
—

 
130

 
—

Renewable energy purchases:
 
 
 
 
 
 
 
PNM from NMRD
1,004

 
—

 
1,374

 
—

Interconnection billings:
 
 
 
 
 
 
 
PNM to NMRD
2,052

 
—

 
2,052

 
—

PNM to PNMR
68,200

 
—

 
68,200

 
—

Interest billings:
 
 
 
 
 
 
 
PNMR to PNM
747

 
9

 
809

 
11

PNM to PNMR
70

 
49

 
136

 
92

PNMR to TNMP
13

 
30

 
22

 
60

Income tax sharing payments:
 
 
 
 
 
 
 
PNMR to PNM
—

 
—

 
—

 
—

TNMP to PNMR
—

 
—

 
—

 
—