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Summary of the Business and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Schedule of Average Rates Used Allocated Between Depreciation Expense and Construction Expense Projects Based on Use of Equipment
Average straight-line rates used were as follows:
 
Year ended December 31
 
2015
 
2014
 
2013
PNM
 
 
 
 
 
Electric plant
2.27
%
 
2.26
%
 
2.27
%
Common, intangible, and general plant
4.66
%
 
4.64
%
 
4.87
%
TNMP
3.94
%
 
3.59
%
 
3.66
%
Schedule of Inventory
Inventories consisted of the following at December 31:
 
 
PNMR
 
PNM
 
TNMP
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
(In thousands)
Coal
$
18,356

 
$
17,525

 
$
18,356

 
$
17,525

 
$
—

 
$
—

Materials and supplies
49,030

 
46,103

 
42,121

 
43,334

 
6,909

 
2,769

 
$
67,386

 
$
63,628

 
$
60,477

 
$
60,859

 
$
6,909

 
$
2,769