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Variable Interest Entities (Tables) (Public Service Company of New Mexico [Member])
3 Months Ended
Mar. 31, 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 March 31,
 
2012
 
2011
 
(In thousands)
Operating revenues
$
4,670

 
$
4,670

Operating expenses
(1,405
)
 
(1,487
)
Earnings attributable to non-controlling interest
$
3,265

 
$
3,183


Financial Position
 
March 31, 2012
 
December 31, 2011
 
(In thousands)
Current assets
$
3,308

 
$
2,405

Net property, plant, and equipment
80,077

 
80,785

Total assets
83,385

 
83,190

Current liabilities
1,706

 
767

Owners’ equity – non-controlling interest
$
81,679

 
$
82,423