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Financing Short-term Debt (Details) (USD $)
 0 Months Ended 12 Months Ended
Oct. 31, 2011
Dec. 31, 2013
Extensions
Dec. 31, 2012
Dec. 31, 2013
Texas-New Mexico Power Company [Member]
Dec. 31, 2012
Texas-New Mexico Power Company [Member]
Apr. 30, 2009
Texas-New Mexico Power Company [Member]
Dec. 31, 2013
Public Service Company of New Mexico [Member]
Dec. 31, 2012
Public Service Company of New Mexico [Member]
Oct. 31, 2011
Public Service Company of New Mexico [Member]
Dec. 31, 2013
Maximum [Member]
Jan. 08, 2014
New Mexico Revolving Credit Facility [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2013
PNMR Term Loan Agreement [Member]
Dec. 31, 2012
PNMR Term Loan Agreement [Member]
Dec. 31, 2013
Revolving Credit Facility [Member]
Public Service Company of New Mexico [Member]
Dec. 31, 2013
PNM Term Loan Agreement [Member]
Public Service Company of New Mexico [Member]
Feb. 22, 2013
Borrowings from PNMR [Member]
Texas-New Mexico Power Company [Member]
Feb. 21, 2014
Available Borrowing Capacity [Member]
Feb. 21, 2014
Subsequent Event [Member]
Feb. 21, 2014
Subsequent Event [Member]
Texas-New Mexico Power Company [Member]
Feb. 21, 2014
Subsequent Event [Member]
Public Service Company of New Mexico [Member]
Feb. 21, 2014
Subsequent Event [Member]
New Mexico Revolving Credit Facility [Member]
Public Service Company of New Mexico [Member]
Short-term Debt [Line Items]                                          
Notes Payable, Related Parties, Current       $ 29,400,000 $ 28,300,000   $ 32,500,000 $ 0   $ 100,000,000           $ 35,800,000          
Line of Credit Facility, Maximum Borrowing Capacity 300,000,000         75,000,000     400,000,000   50,000,000                    
Securities Received as Collateral           75,000,000                              
Line of Credit Facility, Number of Extension Options   2                                      
Line of Credit Facility, Extension Option, Years   1 year                                      
Ratio of debt to capital, maximum (as a percent) 65.00%                                        
Short-term Debt, Weighted Average Interest Rate                       1.02%   1.42% 1.42%            
Line of Credit Facility, Amount Outstanding   0 37,600,000 0 0   49,200,000 21,100,000                          
Short-term debt   149,200,000 158,700,000       49,200,000 21,100,000       100,000,000 100,000,000                
Letters of Credit Outstanding, Amount   8,600,000   300,000     3,200,000                            
Line of Credit Facility, Remaining Borrowing Capacity                                 718,500,000 291,400,000 74,700,000 327,400,000 25,000,000
Invested Cash and Cash Equivalents                                   $ 1,900,000