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Variable Interest Entities (Tables) (Public Service Company of New Mexico [Member])
3 Months Ended
Mar. 31, 2013
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 March 31,
 
2013
 
2012
 
(In thousands)
Operating revenues
$
4,775

 
$
4,670

Operating expenses
(1,571
)
 
(1,405
)
Earnings attributable to non-controlling interest
$
3,204

 
$
3,265


Financial Position
 
March 31,
 
December 31,
 
2013
 
2012
 
(In thousands)
Current assets
$
2,691

 
$
3,655

Net property, plant, and equipment
77,245

 
77,953

Total assets
79,936

 
81,608

Current liabilities
1,149

 
765

Owners’ equity – non-controlling interest
$
78,787

 
$
80,843