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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2013
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
The table below summarizes the nature and amount of related party transactions of PNMR, PNM and TNMP:    
 
 
Year Ended December 31,
 
2013
 
2012
 
2011
 
 
 
(In thousands)
 
 
Electricity, transmission and distribution related services billings:
 
 
 
 
 
TNMP to PNMR
$
—

 
$
—

 
$
33,813

Services billings:
 
 
 
 
 
PNMR to PNM
92,597

 
99,986

 
98,914

PNMR to TNMP
28,937

 
29,110

 
29,353

PNM to TNMP
562

 
595

 
550

TNMP to PNMR
7

 
15

 
164

PNMR to Optim Energy
—

 
—

 
4,083

Optim Energy to PNMR
—

 
—

 
23

Income tax sharing payments:
 
 
 
 
 
PNMR to TNMP
—

 
1,951

 
—

PNMR to PNM
77,433

 
63,114

 
—

  TNMP to PNMR
3,643

 
—

 
—

Interest payments:
 
 
 
 
 
PNM to PNMR
4

 
1

 
54

TNMP to PNMR
481

 
137

 
40