Financing (Details) (USD $)	0 Months Ended			12 Months Ended																0 Months Ended				12 Months Ended						12 Months Ended						0 Months Ended
	Nov. 22, 2011	Nov. 04, 2011	Oct. 05, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 24, 2011	Sep. 23, 2011	Dec. 31, 2013 Unsecured Debt [Member]	Oct. 24, 2011 Unsecured Debt [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member]	Apr. 30, 2012 Public Service Company of New Mexico [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Unsecured Debt [Member]	Oct. 12, 2011 Public Service Company of New Mexico [Member] Unsecured Debt [Member]	Oct. 06, 2011 Public Service Company of New Mexico [Member] Unsecured Debt [Member]	Dec. 31, 2013 Texas-New Mexico Power Company [Member]	Mar. 06, 2013 Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Texas-New Mexico Power Company [Member]	Apr. 03, 2013 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member]	Sep. 30, 2011 Notes Payable to Banks [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Notes Payable to Banks [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Notes Payable to Banks [Member] Texas-New Mexico Power Company [Member]	Dec. 31, 2013 New Mexico Public Regulation Commission [Member] Public Service Company of New Mexico [Member] Extensions	Dec. 31, 2013 Senior unsecured notes, 9.25% due 2015 [Member]	Dec. 31, 2013 Senior unsecured notes, 9.25% due 2015 [Member] Unsecured Debt [Member]	Dec. 31, 2012 Senior unsecured notes, 9.25% due 2015 [Member] Unsecured Debt [Member]	Dec. 31, 2013 PNMR Term Loan Agreement [Member]	Dec. 31, 2012 PNMR Term Loan Agreement [Member]	Dec. 31, 2013 PNMR Term Loan Agreement [Member] Notes Payable to Banks [Member]	Dec. 14, 2012 PNMR Term Loan Agreement [Member] Notes Payable to Banks [Member]	Dec. 31, 2013 2.54% Maturing of September First, 2042 with a Mandatory Tender on June First, 2017 [Member] Public Service Company of New Mexico [Member] Pollution Control Revenue Bonds [Member]	Dec. 31, 2013 5.15% Percent Maturing in 2037 [Member] Public Service Company of New Mexico [Member] Pollution Control Revenue Bonds [Member]	Dec. 31, 2013 PNM Term Loan Agreement [Member] Public Service Company of New Mexico [Member] Unsecured Debt [Member]	Dec. 31, 2012 PNM Term Loan Agreement [Member] Public Service Company of New Mexico [Member] Unsecured Debt [Member]	Apr. 22, 2013 PNM Term Loan Agreement [Member] Notes Payable to Banks [Member]	Dec. 31, 2013 First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member]	Apr. 03, 2013 First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member]	Mar. 06, 2013 First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member]	Dec. 31, 2012 First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member]	Dec. 31, 2013 First Mortgage Bonds 6 Point 95 Percent, due 2043, Series 2013A [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member]	Apr. 03, 2013 First Mortgage Bonds 6 Point 95 Percent, due 2043, Series 2013A [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member]	Mar. 06, 2013 First Mortgage Bonds 6 Point 95 Percent, due 2043, Series 2013A [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member]	Dec. 31, 2012 First Mortgage Bonds 6 Point 95 Percent, due 2043, Series 2013A [Member] Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member]	Dec. 09, 2013 First Mortgage Bonds Due 2024, Series 2014A, at 4 point 03 percent [Member] [Member] Texas-New Mexico Power Company [Member] Pollution Control Revenue Bonds [Member]	Feb. 21, 2014 Subsequent Event [Member]	Feb. 21, 2014 Subsequent Event [Member] Public Service Company of New Mexico [Member]	Feb. 21, 2014 Subsequent Event [Member] Texas-New Mexico Power Company [Member]	Feb. 21, 2014 Subsequent Event [Member] New Mexico Revolving Credit Facility [Member] Public Service Company of New Mexico [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity																																														$ 291,400,000	$ 327,400,000	$ 74,700,000	$ 25,000,000
Preferred Stock, Shares Outstanding								477,800			115,293	115,293
Convertible Preferred Stock, Shares Issued upon Conversion								4,778,000
Preferred Stock Purchase Discount								0.02
Payments for Repurchase of Convertible Preferred Stock			73,500,000
Preferred Stock, Value, Outstanding			100,000,000
Unsecured Long-term Debt, Noncurrent							50,000,000																			118,766,000	142,592,000							75,000,000	0		172,302,000			265,500,000	93,198,000			0
Debt Instrument, Interest Rate, Stated Percentage									9.25%	9.25%						5.35%																2.54%	5.15%				9.50%	9.50%	9.50%	9.50%	6.95%	6.95%	6.95%	6.95%	4.03%
Debt Instrument, Repurchase Premium							0.17
Debt Instrument, Face Amount	50,000,000															160,000,000		1,000							23,800,000							20,000,000							265,500,000			93,200,000			80,000,000
Repayments of Unsecured Debt	58,500,000			26,900,000
Loss on reacquired debt				3,253,000	0	9,209,000
Common stock, shares outstanding		7,019,550		79,653,624	79,653,624						39,117,799	39,117,799					6,358		6,358
Common Stock Repurchase Discount		0.02
Payments for Repurchase of Common Stock		125,700,000		0	0	125,683,000
Short-term debt				149,200,000	158,700,000						49,200,000	21,100,000																100,000,000	100,000,000		100,000,000					75,000,000
Proceeds from Short-term Debt				0	100,000,000	0																								100,000,000
Debt Instrument Issuance, Face Amount Percentage															0.99857
Debt Instrument, Requested Approval to Refinance Debt													20,000,000
Line of Credit Facility, Number of Extension Options Received Authority To Exercise																								2
Line of Credit Facility, Extension Option Granted Authority To Exercise, Years																								1 year
Debt Instrument, Refunded Amount Redeemed at Par and Retired																																	20,000,000
Repayments of Lines of Credit																														100,000,000						75,000,000
Debt Instrument, Shelf Registration Statement for Unsecured Debt														440,000,000
Proceeds from Bank Debt																					50,000,000
Debt Instrument, Amount Secured by Collateral																						50,000,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum																					1.475%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum																					1.985%
Debt Instrument, Interest Rate, Effective Percentage																						3.566%
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value																						200,000	300,000
Debt Instrument, Cash Offered for Debt Exchanged																		140
Debt Instrument, Cash Paid for Debt Exchanged																				13,000,000
Debt Instrument, Unamortized Premium																																										$ 23,200,000