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Asset Retirement Obligations (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Liability Beginning Balance $ 85,893,000 $ 79,233,000 $ 76,637,000
Liabilities incurred 0 0 60,000
Liabilities settled (79,000) (25,000) (4,000)
Accretion expense 7,245,000 6,685,000 6,114,000
Revisions to estimated cash flows 3,076,000 [1]   (3,574,000) [1]
Liability Ending Balance 96,135,000 85,893,000 79,233,000
Public Service Company of New Mexico [Member]
      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Liability Beginning Balance 85,042,000 78,425,000 75,888,000
Liabilities incurred 0 0 60,000
Liabilities settled (67,000) 0 0
Accretion expense 7,174,000 6,617,000 6,051,000
Revisions to estimated cash flows 3,076,000 [1]   (3,574,000) [1]
Liability Ending Balance 95,225,000 85,042,000 78,425,000
Texas-New Mexico Power Company [Member]
      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Liability Beginning Balance 732,000 699,000 648,000
Liabilities incurred 0 0 0
Liabilities settled (12,000) (25,000) (4,000)
Accretion expense 62,000 58,000 55,000
Revisions to estimated cash flows 0 [1]   0 [1]
Liability Ending Balance 782,000 732,000 699,000
Palo Verde Nuclear Generating Station [Member] | Public Service Company of New Mexico [Member]
      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation, Period Increase (Decrease) 500,000   (4,200,000)
San Juan Generating Station [Member] | Public Service Company of New Mexico [Member]
      
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset Retirement Obligation, Period Increase (Decrease) $ 2,500,000    
[1] Based on studies to estimate the amount and timing of future ARO expenditures. PNM has an ARO for PVNGS that includes the obligations for nuclear decommissioning of that facility. In 2011 and 2013, new decommissioning studies for PVNGS were implemented reflecting updated cash flow estimates, including the extended operating licenses. The new studies resulted in a $4.2 million decrease to the ARO in 2011 and an increase of $0.5 million to the ARO in 2013. In addition, a new decommissioning study for SJGS was implemented in 2013, resulting in a $2.5 million increase to the ARO.