Fair Value of Derivative and Other Financial Instruments, Defined Benefit Plans Disclosure (Details) (USD $) In Thousands, unless otherwise specified																																																																																																	12 Months Ended														12 Months Ended								12 Months Ended
	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] PNMR [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] PNMR [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Cash and Cash Equivalents [Member] PNMR [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Cash and Cash Equivalents [Member] PNMR [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, International Funds [Member] PNMR [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, International Funds [Member] PNMR [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Value [Member] PNMR [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Value [Member] PNMR [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Growth [Member] PNMR [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Growth [Member] PNMR [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, Corporate [Member] PNMR [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, Corporate [Member] PNMR [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, Municipals [Member] PNMR [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, Municipals [Member] PNMR [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Private Equity Funds [Member] PNMR [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Private Equity Funds [Member] PNMR [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Hedge Funds [Member] PNMR [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Hedge Funds [Member] PNMR [Member]	Dec. 31, 2013 Estimate of Fair Value, Fair Value Disclosure [Member] Real Estate [Member] PNMR [Member]	Dec. 31, 2012 Estimate of Fair Value, Fair Value Disclosure [Member] Real Estate [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Cash and Cash Equivalents [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Cash and Cash Equivalents [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Equity Securities, International Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Equity Securities, International Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Value [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Value [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Growth [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Growth [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Equity Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Equity Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, Corporate [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, Corporate [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, Municipals [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, Municipals [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Private Equity Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Private Equity Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Hedge Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Hedge Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 1 [Member] Real Estate [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 1 [Member] Real Estate [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Cash and Cash Equivalents [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Cash and Cash Equivalents [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Equity Securities, International Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Equity Securities, International Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Value [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Value [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Growth [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Growth [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Equity Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Equity Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, Corporate [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, Corporate [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, Municipals [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, Municipals [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Private Equity Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Private Equity Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Hedge Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Hedge Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 2 [Member] Real Estate [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] Real Estate [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Cash and Cash Equivalents [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Cash and Cash Equivalents [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Equity Securities, International Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Equity Securities, International Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Value [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Value [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Growth [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Growth [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Equity Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Equity Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, Corporate [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, Corporate [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, U.S. Government [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, Municipals [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, Municipals [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Fixed Income Securities, Other Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Private Equity Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Private Equity Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Hedge Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Hedge Funds [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Real Estate [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Real Estate [Member] PNMR [Member]	Dec. 31, 2013 Fair Value, Inputs, Level 3 [Member] Private Equity, Hedge and Real Estate Funds [Member] PNMR [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Private Equity, Hedge and Real Estate Funds [Member] PNMR [Member]	Dec. 31, 2013 Pension Plan [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Pension Plan [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2011 Pension Plan [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Pension Plan [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Pension Plan [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2011 Pension Plan [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Pension Plan [Member] Estimate of Fair Value, Fair Value Disclosure [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Pension Plan [Member] Estimate of Fair Value, Fair Value Disclosure [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Pension Plan [Member] Estimate of Fair Value, Fair Value Disclosure [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Pension Plan [Member] Estimate of Fair Value, Fair Value Disclosure [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Pension Plan [Member] Fair Value, Inputs, Level 1 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Pension Plan [Member] Fair Value, Inputs, Level 1 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Pension Plan [Member] Fair Value, Inputs, Level 1 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Pension Plan [Member] Fair Value, Inputs, Level 1 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Pension Plan [Member] Fair Value, Inputs, Level 2 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Pension Plan [Member] Fair Value, Inputs, Level 2 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Pension Plan [Member] Fair Value, Inputs, Level 2 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Pension Plan [Member] Fair Value, Inputs, Level 2 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Pension Plan [Member] Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Pension Plan [Member] Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Pension Plan [Member] Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Pension Plan [Member] Fair Value, Inputs, Level 3 [Member] PNMR Master Trust [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2011 Other Postretirement Benefits [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2011 Other Postretirement Benefits [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Equity Securities, Domestic Value [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Equity Securities, Domestic Value [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Estimate of Fair Value, Fair Value Disclosure [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Value [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Value [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 1 [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Value [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Value [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 2 [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Cash and Cash Equivalents [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Cash and Cash Equivalents [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, International Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, International Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Value [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Value [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Growth [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Domestic Growth [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Other Funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Equity Securities, Other Funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Fixed income securities, Mutual funds [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Other Postretirement Benefits [Member] Fair Value, Inputs, Level 3 [Member] Fixed income securities, Mutual funds [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Carrying (Reported) Amount, Fair Value Disclosure [Member] PNMR [Member]	Dec. 31, 2012 Carrying (Reported) Amount, Fair Value Disclosure [Member] PNMR [Member]	Dec. 31, 2013 Carrying (Reported) Amount, Fair Value Disclosure [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2012 Carrying (Reported) Amount, Fair Value Disclosure [Member] Public Service Company of New Mexico [Member]	Dec. 31, 2013 Carrying (Reported) Amount, Fair Value Disclosure [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Carrying (Reported) Amount, Fair Value Disclosure [Member] Texas-New Mexico Power Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Long-term debt	$ 1,905,230	$ 1,969,362	$ 1,382,938	$ 1,385,433	$ 390,814	$ 418,166																									$ 0	$ 0	$ 0	$ 0	$ 0	$ 0																									$ 1,905,230	$ 1,966,725	$ 1,382,938	$ 1,385,433	$ 390,814	$ 418,166																									$ 0	$ 2,637	$ 0	$ 0	$ 0	$ 0																																																																																																																																																																			$ 1,745,420	$ 1,672,290	$ 1,290,618	$ 1,215,579	$ 336,036	$ 311,589
Investment in PVNGS lessor notes	57,279	84,198	57,279	84,198																											0	0	0	0																											0	0	0	0																											57,279	84,198	57,279	84,198																																																																																																																																																																					52,958	77,682	52,958	77,682
Other investments	3,196	6,965	445	494	245	281																									690	774	445	494	245	281																									0	0	0	0	0	0																									2,506	6,191	0	0	0	0																																																																																																																																																																			1,835	5,599	445	494	245	281
Defined Benefit Plan, Fair Value of Plan Total Assets Owned At the End of Period																																																																																																																																																													74,133	65,536	9,734	8,760
Fair value of plan assets at beginning of year	623,543	583,688					16,281	10,404	24,471	39,867	41,451	39,492	36,805	63,888	22,522	17,035	202,897	101,936	99,748	148,341	17,259	3,639	66,286	65,898	39,122	38,212	34,912	31,277	21,789	23,699	164,021	231,953					16,281	10,404	24,471	39,867	41,451	39,492	36,805	63,888	0	0	363	0	44,541	78,302	0	0	109	0	0	0	0	0	0	0	363,523	258,547					0	0	0	0	0	0	0	0	22,522	17,035	202,358	101,936	55,207	70,039	17,259	3,639	66,177	65,898	0	0	0	0	0	0	95,999	93,188					79,017	84,133	14,171	14,555	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	38,212	37,100	31,277	36,904	23,699	24,684	93,188	98,688	556,353	518,095	427,386	66,118	66,540	59,952	557,258	517,238	66,285	66,450	145,364	205,491	18,657	26,462	330,903	232,730	32,620	25,817	80,991	79,017	15,008	14,171	73,565	64,464	58,776	9,601	8,643	8,303	6,388	381					1,152	4,976	302	42	3,057	2,651	1,334	1,444	54,851	46,145	1,848	1,289	5,564	7,588	4,167	3,660	3,121	4,176	1,702	2,325	31,430	28,663	4,233	3,656	1,152	4,976	302	42	0	0	0	0	6,388	381	20,769	19,511	1,848	1,289	0	0	0	0	3,121	4,176	1,702	2,325	42,703	36,873	5,501	5,104	0	0	0	0	3,057	2,651	1,334	1,444	0	0	34,082	26,634	0	0	5,564	7,588	4,167	3,660	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Actual return on assets sold during the period																																																																																																	3,303	2,627	1,400	197											0	0							4,677	2,966	135	(80)	(109)	(62)	4,703	2,824
Actual return on assets still held at period end																																																																																																	3,361	2,386	1,425	179											1	0							1,162	40	3,500	2,453	123	72	4,786	2,565
Purchases																																																																																																	15,110	5,498	6,408	413											175	0							3,117	3,906	16,151	0	2,076	2,005	21,519	5,911
Sales																																																																																																	(19,800)	15,627	(8,396)	1,173											0	0							(8,046)	(5,800)	(16,151)	(8,000)	(4,000)	(3,000)	(28,197)	(16,800)
Fair value of plan assets at end of year	$ 623,543	$ 583,688					$ 16,281	$ 10,404	$ 24,471	$ 39,867	$ 41,451	$ 39,492	$ 36,805	$ 63,888	$ 22,522	$ 17,035	$ 202,897	$ 101,936	$ 99,748	$ 148,341	$ 17,259	$ 3,639	$ 66,286	$ 65,898	$ 39,122	$ 38,212	$ 34,912	$ 31,277	$ 21,789	$ 23,699	$ 164,021	$ 231,953					$ 16,281	$ 10,404	$ 24,471	$ 39,867	$ 41,451	$ 39,492	$ 36,805	$ 63,888	$ 0	$ 0	$ 363	$ 0	$ 44,541	$ 78,302	$ 0	$ 0	$ 109	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 363,523	$ 258,547					$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 22,522	$ 17,035	$ 202,358	$ 101,936	$ 55,207	$ 70,039	$ 17,259	$ 3,639	$ 66,177	$ 65,898	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 95,999	$ 93,188					$ 80,991	$ 79,017	$ 15,008	$ 14,171	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 176	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 39,122	$ 38,212	$ 34,912	$ 31,277	$ 21,789	$ 23,699	$ 95,999	$ 93,188	$ 556,353	$ 518,095	$ 427,386	$ 66,118	$ 66,540	$ 59,952	$ 557,258	$ 517,238	$ 66,285	$ 66,450	$ 145,364	$ 205,491	$ 18,657	$ 26,462	$ 330,903	$ 232,730	$ 32,620	$ 25,817	$ 80,991	$ 79,017	$ 15,008	$ 14,171	$ 73,565	$ 64,464	$ 58,776	$ 9,601	$ 8,643	$ 8,303	$ 6,388	$ 381					$ 1,152	$ 4,976	$ 302	$ 42	$ 3,057	$ 2,651	$ 1,334	$ 1,444	$ 54,851	$ 46,145	$ 1,848	$ 1,289	$ 5,564	$ 7,588	$ 4,167	$ 3,660	$ 3,121	$ 4,176	$ 1,702	$ 2,325	$ 31,430	$ 28,663	$ 4,233	$ 3,656	$ 1,152	$ 4,976	$ 302	$ 42	$ 0	$ 0	$ 0	$ 0	$ 6,388	$ 381	$ 20,769	$ 19,511	$ 1,848	$ 1,289	$ 0	$ 0	$ 0	$ 0	$ 3,121	$ 4,176	$ 1,702	$ 2,325	$ 42,703	$ 36,873	$ 5,501	$ 5,104	$ 0	$ 0	$ 0	$ 0	$ 3,057	$ 2,651	$ 1,334	$ 1,444	$ 0	$ 0	$ 34,082	$ 26,634	$ 0	$ 0	$ 5,564	$ 7,588	$ 4,167	$ 3,660	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0