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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2012
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:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2012
 
2011
 
2012
 
2011
 
(In thousands)
Electricity, transmission and distribution related services billings:
 
 
 
 
 
 
 
TNMP to PNMR
$
—

 
$
9,598

 
$
—

 
$
18,412

Services billings:
 
 
 
 
 
 
 
PNMR to PNM
23,832

 
24,733

 
45,887

 
46,169

PNMR to TNMP
6,816

 
7,374

 
13,767

 
13,955

PNM to TNMP
168

 
160

 
289

 
287

TNMP to PNMR
4

 
44

 
8

 
97

PNMR to Optim Energy
—

 
1,404

 
—

 
2,804

Optim Energy to PNMR
—

 
9

 
—

 
19

Interest billings:
 
 
 
 
 
 
 
PNMR to TNMP
32

 
26

 
50

 
28

PNMR to PNM
1

 
8

 
1

 
36

PNM to PNMR
44

 
32

 
89

 
64

Income tax sharing payments:
 
 
 
 
 
 
 
PNMR to PNM
—

 
—

 
63,114

 
—

PNMR to TNMP
—

 
—

 
1,952

 
—