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Related Party Transactions (Tables)
 3 Months Ended
Mar. 31, 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
 
March 31,
 
2012
 
2011
 
(In thousands)
Electricity, transmission and distribution related services billings:
 
 
 
TNMP to PNMR
$
—

 
$
8,814

Services billings:
 
 
 
PNMR to PNM
22,055

 
21,437

PNMR to TNMP
6,951

 
6,581

PNM to TNMP
121

 
122

TNMP to PNMR
4

 
53

PNMR to Optim Energy
—

 
1,400

Optim Energy to PNMR
—

 
11

Income tax sharing payments:
 
 
 
PNMR to PNM
63,114

 
—

PNMR to TNMP
1,952

 
—

Interest charges:
 
 
 
TNMP to PNMR
18

 
2

PNM to PNMR
—

 
28

PNMR to PNM
45

 
32