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Fair Value of Derivative and Other Financial Instruments, Available for Sale Securities (Details) (PNMR and PNM [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains			$ 43,613		$ 42,602
Available-for-sale securities, Fair value	236,427		236,427		226,855
Proceeds from sales	30,316	61,821	53,119	76,106
Gross realized gains	5,364	4,905	8,482	6,243
Gross realized (losses)	(665)	(1,688)	(1,210)	(1,496)
Cash and equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains			0		0
Available-for-sale securities, Fair value	3,114		3,114		3,356
Domestic value [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains			16,014		14,523
Available-for-sale securities, Fair value	42,664		42,664		39,460
Domestic growth [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains			19,931		25,656
Available-for-sale securities, Fair value	75,621		75,621		76,292
International and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains			2,227		1,040
Available-for-sale securities, Fair value	17,848		17,848		16,633
U.S. Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains			534		158
Available-for-sale securities, Fair value	19,814		19,814		21,941
Municipals [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains			4,282		1,018
Available-for-sale securities, Fair value	65,872		65,872		58,568
Corporate and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Unrealized gains			625		207
Available-for-sale securities, Fair value	11,494		11,494		10,605
Fair Value, Measurements, Recurring [Member] | Nuclear Decommissioning Trust [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	231,900		231,900		222,500
Fair Value, Measurements, Recurring [Member] | Mine Reclamation Trust [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	$ 4,500		$ 4,500		$ 4,400

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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-Glossary Investing Activities

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