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Variable Interest Entities (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Public Service Company of New Mexico [Member]
LeaseAgreements
InstitutionalInvestors
Sep. 30, 2012
Public Service Company of New Mexico [Member]
Jun. 30, 2012
Public Service Company of New Mexico [Member]
Mar. 31, 2012
Public Service Company of New Mexico [Member]
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Sep. 30, 2011
Public Service Company of New Mexico [Member]
Jun. 30, 2011
Public Service Company of New Mexico [Member]
Mar. 31, 2011
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
LeaseAgreements
InstitutionalInvestors
Dec. 31, 2011
Public Service Company of New Mexico [Member]
Dec. 31, 2010
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Valencia [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2011
Valencia [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2010
Valencia [Member]
Public Service Company of New Mexico [Member]
May 30, 2008
Valencia [Member]
Public Service Company of New Mexico [Member]
MW
Dec. 31, 2012
Valencia [Member]
Maximum [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
PVNGS [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Delta [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2011
Delta [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2010
Delta [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Palo Verde Nuclear Generating Station [Member]
PVNGS [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2011
Palo Verde Nuclear Generating Station [Member]
PVNGS [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Delta [Member]
Public Service Company of New Mexico [Member]
Variable Interest Entity [Line Items]                                                                    
Number of mega watts purchased (in megawatts)                                                   145                
Operating Leases, Currently active with trusts                       8               8                            
Operating Leases, trust lessors                       8               8                            
Operating Leases, Different institutional investors of trust lessors                       5               5                            
Operating Leases, renewal options after original lease term                 6 years                     2                            
Operating Leases, Extended lease term option                                       6                            
Operating leases, future minimum payments due                       $ 242,089,000               $ 242,089,000               $ 80,000,000            
Power plant total construction costs                                                   90,000,000                
Jointly owned utility plant, option to purchase proportionate ownership share                                                     50.00%              
Long term contract for purchase of electric power fixed costs                                             18,800,000 18,300,000 17,900,000       6,200,000 6,000,000 6,000,000      
Long term contract for purchase of electric power variable charges                                             900,000 1,400,000 1,100,000       800,000 1,500,000 400,000      
Variable Interest Entity, Statement Of Operation [Abstract]                                                                    
Electric Revenue                                             19,585,000 19,720,000 18,907,000                  
Operating expenses                                             (5,535,000) (5,673,000) (5,344,000)                  
Earnings Attributable to non-controlling interest                 14,050,000 14,047,000 13,563,000                 14,050,000 14,047,000 13,563,000 (14,050,000) (14,047,000) (13,563,000)                  
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                                                                    
Current assets 442,191,000       462,819,000       442,191,000 462,819,000   387,689,000       459,621,000       387,689,000 459,621,000   3,655,000 2,405,000                    
Net property, plant and equipment                                             77,953,000 80,785,000                    
Total Assets 5,372,583,000       5,204,613,000       5,372,583,000 5,204,613,000 5,225,083,000 4,163,907,000       4,095,287,000       4,163,907,000 4,095,287,000   81,608,000 83,190,000                    
Current liabilities 434,103,000       373,268,000       434,103,000 373,268,000   242,751,000       290,563,000       242,751,000 290,563,000   765,000 767,000                    
Owners' equity - non-controlling interest (80,843,000)       (82,423,000)       (80,843,000) (82,423,000)   (80,843,000)       (82,423,000)       (80,843,000) (82,423,000)   80,843,000 82,423,000                    
Loss contingency, range of possible loss, portion not accrued                                                       167,600,000            
Operating Leases, Future Minimum Payments Due, Current                       40,217,000               40,217,000                       26,000,000 26,000,000  
Long Term Contract For Purchase of Power Term of Contract                                             20 years                      
Long Term Contract for Purchase of Electric Power Aggregate Amount of Contract Remaining                                                         45,200,000          
Payments to Acquire Businesses, Gross                                                                   23,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt                                                                   19,200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt                                                                   3,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets                                                                   26,600,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment                                                                   23,100,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                                                                   21,100,000
Revenues                                                                   7,400,000
Net Earnings (Loss) Attributable to PNMR $ 9,091,000 $ 57,864,000 $ 21,512,000 $ 17,080,000 $ 111,993,000 $ 43,662,000 $ 4,067,000 $ 16,637,000 $ 105,547,000 $ 176,359,000 $ (45,215,000) $ 5,943,000 $ 50,911,000 $ 16,885,000 $ 17,812,000 $ 13,622,000 $ 38,461,000 $ (1,373,000) $ 3,781,000 $ 91,551,000 $ 54,491,000 $ 57,298,000                       $ 900,000