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Variable Interest Entities (Tables) (Public Service Company of New Mexico [Member])
6 Months Ended
Jun. 30, 2012
Public Service Company of New Mexico [Member]
 
Variable Interest Entity [Line Items]  
Noncontrolling Interest Summarized Financial Information [Table Text Block]
Summarized financial information for Valencia is as follows:

Results of Operations
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2012
 
2011
 
2012
 
2011
 
(In thousands)
Operating revenues
$
4,888

 
$
4,849

 
$
9,559

 
$
9,519

Operating expenses
(1,433
)
 
(1,379
)
 
(2,839
)
 
(2,867
)
Earnings attributable to non-controlling interest
$
3,455

 
$
3,470

 
$
6,720

 
$
6,652


Financial Position
 
June 30,
 
December 31,
 
2012
 
2011
 
(In thousands)
Current assets
$
3,092

 
$
2,405

Net property, plant, and equipment
79,369

 
80,785

Total assets
82,461

 
83,190

Current liabilities
767

 
767

Owners’ equity – non-controlling interest
$
81,694

 
$
82,423