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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2011
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,
 
2011
 
2010
 
2009
 
 
 
(In thousands)
 
 
Electricity, transmission and distribution related services billings:
 
 
 
 
 
TNMP to PNMR
$
33,813

 
$
39,084

 
$
41,338

Services billings:
 
 
 
 
 
PNMR to PNM(1)
98,914

 
93,602

 
80,141

PNMR to TNMP
29,353

 
25,455

 
22,919

PNM to TNMP
550

 
400

 
698

TNMP to PNMR
164

 
319

 
636

PNMR to Optim Energy
4,083

 
5,778

 
6,743

Optim Energy to PNMR
23

 
173

 
305

Income tax sharing payments:
 
 
 
 
 
PNM to PNMR
—

 
—

 
126,527

TNMP to PNMR
—

 
—

 
4,322

PNMR to TNMP
—

 
(13,869
)
 
—

PNMR to PNM
—

 
(59,298
)
 
—

Interest payments:
 
 
 
 
 
PNM to PNMR
54

 
13

 
8

TNMP to PNMR
40

 
281

 
849

(1) Includes billings to PNM Gas of $0.9 million in 2009.