Financing Schedule of Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Oct. 24, 2011	Dec. 31, 2013 Unsecured Debt [Member]	Oct. 24, 2011 Unsecured Debt [Member]	Dec. 31, 2013 Unsecured Debt [Member] Senior unsecured notes, 9.25% due 2015 [Member]	Dec. 31, 2012 Unsecured Debt [Member] Senior unsecured notes, 9.25% due 2015 [Member]	Dec. 31, 2013 Other [Member]	Dec. 31, 2012 Other [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 4.875% due 2033 [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 4.875% due 2033 [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 6.25% due 2038 [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 6.25% due 2038 [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 4.75% due 2040, mandatory tender at June 1, 2017 [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 4.75% due 2040, mandatory tender at June 1, 2017 [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 5.20% due 2040, mandatory tender at June 1, 2020 [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 5.20% due 2040, mandatory tender at June 1, 2020 [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 5.90% due 2040 [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 5.90% due 2040 [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 6.25% due 2040 [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 6.25% due 2040 [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 2.54% due 2042, mandatory tender at June 1, 2017 [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 2.54% due 2042, mandatory tender at June 1, 2017 [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 4.00% due 2043, mandatory tender at June 1, 2015 [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 4.00% due 2043, mandatory tender at June 1, 2015 [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 5.20% due 2043, mandatory tender at June 1, 2020 [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] 5.20% due 2043, mandatory tender at June 1, 2020 [Member]	Oct. 06, 2011 Public Service Company of New Mexico [Member] Unsecured Debt [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Unsecured Debt [Member] 7.95% due 2018 [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Unsecured Debt [Member] 7.95% due 2018 [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Unsecured Debt [Member] 7.50% due 2018 [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Unsecured Debt [Member] 7.50% due 2018 [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Unsecured Debt [Member] 5.35% due 2021 [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Unsecured Debt [Member] 5.35% due 2021 [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Unsecured Debt [Member] PNM Term Loan Agreement [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Unsecured Debt [Member] PNM Term Loan Agreement [Member]	Dec. 31, 2013 Public Service Company of New Mexico [Member] Other [Member]	Dec. 31, 2012 Public Service Company of New Mexico [Member] Other [Member]	Dec. 31, 2013 Texas-New Mexico Power Company [Member]	Dec. 31, 2012 Texas-New Mexico Power Company [Member]	Dec. 31, 2013 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] 2011 Term Loan Agreement, due 2014 [Member]	Dec. 31, 2012 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] 2011 Term Loan Agreement, due 2014 [Member]	Dec. 31, 2013 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member]	Apr. 03, 2013 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member]	Mar. 06, 2013 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member]	Dec. 31, 2012 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member]	Dec. 31, 2013 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] First Mortgage Bonds 6 Point 95 Percent, due 2043, Series 2013A [Member]	Apr. 03, 2013 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] First Mortgage Bonds 6 Point 95 Percent, due 2043, Series 2013A [Member]	Mar. 06, 2013 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] First Mortgage Bonds 6 Point 95 Percent, due 2043, Series 2013A [Member]	Dec. 31, 2012 Texas-New Mexico Power Company [Member] First Mortgage Bonds [Member] First Mortgage Bonds 6 Point 95 Percent, due 2043, Series 2013A [Member]	Dec. 31, 2013 Texas-New Mexico Power Company [Member] Other [Member]	Dec. 31, 2012 Texas-New Mexico Power Company [Member] Other [Member]	Dec. 31, 2013 PNMR [Member]	Dec. 31, 2012 PNMR [Member]	Dec. 31, 2013 PNMR [Member] Unsecured Debt [Member] Senior unsecured notes, 9.25% due 2015 [Member]	Dec. 31, 2012 PNMR [Member] Unsecured Debt [Member] Senior unsecured notes, 9.25% due 2015 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				9.25%	9.25%							4.875%	4.875%	6.25%	6.25%	4.75%	4.75%	5.20%	5.20%	5.90%	5.90%	6.25%	6.25%	2.54%	2.54%	4.00%	4.00%	5.20%	5.20%	5.35%	7.95%	7.95%	7.50%	7.50%	5.35%	5.35%									9.50%	9.50%	9.50%	9.50%	6.95%	6.95%	6.95%	6.95%					9.25%	9.25%
Unsecured Long-term Debt, Noncurrent			$ 50,000			$ 118,766	$ 142,592	$ 0	$ 2,530			$ 146,000	$ 146,000	$ 36,000	$ 36,000	$ 37,000	$ 37,000	$ 40,045	$ 40,045	$ 255,000	$ 255,000	$ 11,500	$ 11,500	$ 20,000	$ 20,000	$ 39,300	$ 39,300	$ 21,000	$ 21,000		$ 350,000	$ 350,000	$ 100,025	$ 100,025	$ 160,000	$ 160,000	$ 75,000	$ 0					$ 50,000	$ 50,000	$ 172,302			$ 265,500	$ 93,198			$ 0
Unamortized premiums (discounts)																																							(252)	(291)													20,536	(3,911)
Long-term Debt	1,745,420	1,672,290								1,290,618	1,215,579																														336,036	311,589													118,766	145,122
Less current maturities	75,000	2,530								75,000	0																														0	0													0	2,530
Long-term Debt, Excluding Current Maturities	$ 1,670,420	$ 1,669,760								$ 1,215,618	$ 1,215,579																														$ 336,036	$ 311,589													$ 118,766	$ 142,592