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Optim Energy (Tables)
 12 Months Ended
Dec. 31, 2011
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Equity Method Investments [Table Text Block]
Summarized financial information for Optim Energy is presented below although summarized balance sheet information for 2011 is not presented since PNMR ceased using the equity method of accounting.
Results of Operations
 
 
 
 
 
Nine Months Ended September 30, 2011
 
Year Ended December 31,
 
 
2010
 
2009
 
(In thousands)
Operating revenues
$
256,786

 
$
374,358

 
$
319,507

Gross margin
84,689

 
109,980

 
117,960

Net earnings (loss)
(21,434
)
 
(25,090
)
 
(56,826
)
 
PNMR recognized net earnings (loss) from Optim Energy of zero, $(15.2) million, and $(30.1) million for the years ended December 31, 2011, 2010, and 2009. The 2010 and 2009 amounts include amortization of a basis difference between PNMR's recorded investment in Optim Energy and 50 percent of Optim Energy's equity.
Financial Position
 
 
 
 
 
December 31,
 
 
2010
 
 
(In thousands)
Current assets
 
$
105,413

Non-current assets
 
1,045,248

Current liabilities
 
(50,226
)
Long-term debt
 
(717,000
)
Other long-term liabilities
 
(7,515
)
   Owners' equity
 
$
375,920

 
 
 
50 percent of owners' equity
 
$
187,960

PNMR basis difference in Optim Energy
 
216

Impairment of equity investment in Optim Energy
 
(188,176
)
   PNMR equity investment in Optim Energy
 
$
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