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Summary of the Business and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Schedule of Inventory, Current

Inventories consisted of the following at December 31:

	PNMR								PNM								TNMP
	2014				2013				2014				2013				2014				2013
	(In thousands)
Coal	$	17,525			$	24,872			$	17,525			$	24,872			$	—			$	—
Materials and supplies	46,103				42,351				43,334				39,648				2,769				2,703
	$	63,628			$	67,223			$	60,859			$	64,520			$	2,769			$	2,703

Schedule of Average Rates Used Allocated Between Depreciation Expense and Construction Expense Projects Based on Use of Equipment

Average straight-line rates used were as follows:

	Year ended December 31
	2014			2013			2012
PNM
Electric plant	2.26	%		2.27	%		2.25	%
Common, intangible, and general plant	4.64	%		4.87	%		5.35	%
TNMP	3.59	%		3.66	%		3.56	%

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- Definition

Schedule of Average Rates Used Allocated Between Depreciation Expense and Construction Expense Projects Based on Use of Equipment [Table Text Block]

+ References

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Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 2

-Paragraph 6

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-Article 5

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