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Summary of the Business and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Accounting Policies [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consisted of the following at December 31:
 
 
PNMR
 
PNM
 
TNMP
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
(In thousands)
Coal
$
24,872

 
$
19,231

 
$
24,872

 
$
19,231

 
$
—

 
$
—

Materials and supplies
42,351

 
40,412

 
39,648

 
37,559

 
2,703

 
2,853

 
$
67,223

 
$
59,643

 
$
64,520

 
$
56,790

 
$
2,703

 
$
2,853
Schedule of Average Rates Used Allocated Between Depreciation Expense and Construction Expense Projects Based on Use of Equipment [Table Text Block]
Average straight-line rates used were as follows:
 
Year ended December 31
 
2013
 
2012
 
2011
PNM
 
 
 
 
 
Electric plant
2.27
%
 
2.25
%
 
2.24
%
Common, intangible, and general plant
4.87
%
 
5.35
%
 
6.03
%
TNMP
3.66
%
 
3.56
%
 
3.41
%