Fair Value of Derivative and Other Financial Instruments, Derivative Balance Sheet Information (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Commodity derivative instruments, Current assets	$ 4,064,000	$ 3,785,000
Commodity derivative instruments, Deferred charges	3,002,000	352,000
Commodity derivative instruments, Current liabilities	(2,699,000)	(1,000,000)
Commodity derivative instruments, Long-term liabilities	(1,094,000)	(1,933,000)
PNMR and PNM [Member]
Derivatives, Fair Value [Line Items]
Margin Deposit Assets	2,800,000	1,900,000
Derivative, Collateral, Obligation to Return Cash	200,000	0
Public Service Company of New Mexico [Member]
Derivatives, Fair Value [Line Items]
Commodity derivative instruments, Current assets	4,064,000	3,785,000
Commodity derivative instruments, Deferred charges	3,002,000	352,000
Commodity derivative instruments, Current liabilities	(2,699,000)	(1,000,000)
Commodity derivative instruments, Long-term liabilities	(1,094,000)	(1,933,000)
Commodity Contract [Member] | Economic hedges [Member] | PNMR and PNM [Member]
Derivatives, Fair Value [Line Items]
Commodity derivative instruments, Current assets	4,064,000	3,785,000
Commodity derivative instruments, Deferred charges	3,002,000	352,000
Commodity derivative instruments, Assets	7,066,000	4,137,000
Commodity derivative instruments, Current liabilities	(2,699,000)	(1,000,000)
Commodity derivative instruments, Long-term liabilities	(1,094,000)	(1,933,000)
Commodity derivative instruments, Liabilities	(3,793,000)	(2,933,000)
Commodity derivative instruments, Net	3,273,000	1,204,000
Commodity Contract [Member] | Fuel and purchased power adjustment clause [Member] | Economic hedges [Member] | Public Service Company of New Mexico [Member]
Derivatives, Fair Value [Line Items]
Commodity derivative instruments, Current assets	400,000	100,000
Commodity derivative instruments, Current liabilities	$ (100,000)