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Related Party Transactions (Tables)
 9 Months Ended
Sep. 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
 
Nine Months Ended
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
 
(In thousands)
Services billings:
 
 
 
 
 
 
 
PNMR to PNM
$
22,972

 
$
23,451

 
$
69,122

 
$
71,044

PNMR to TNMP
8,074

 
7,828

 
24,497

 
23,771

PNM to TNMP
104

 
115

 
281

 
302

TNMP to PNMR
35

 
35

 
105

 
106

TNMP to PNM
—

 
8

 
—

 
154

PNMR to NMRD
32

 
—

 
162

 
—

Renewable energy purchases:
 
 
 
 
 
 
 
PNM from NMRD
969

 
—

 
2,343

 
—

Interconnection billings:
 
 
 
 
 
 
 
PNM to NMRD
47

 
—

 
2,099

 
—

PNM to PNMR
—

 
—

 
68,200

 
—

Interest billings:
 
 
 
 
 
 
 
PNMR to PNM
844

 
3

 
1,653

 
14

PNM to PNMR
75

 
71

 
211

 
163

PNMR to TNMP
65

 
66

 
87

 
126

Income tax sharing payments:
 
 
 
 
 
 
 
PNMR to PNM
—

 
—

 
—

 
—

TNMP to PNMR
—

 
—

 
—

 
—