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Capitalization, Short-term Debt (Details) (USD $)					0 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Oct. 31, 2011 Public Service Company of New Mexico [Member] Affiliated Entity [Member]	Sep. 30, 2011 Public Service Company of New Mexico [Member] Affiliated Entity [Member]	Nov. 01, 2011 Public Service Company of New Mexico [Member] Affiliated Entity [Member] Issuance of Debt [Member]	Oct. 31, 2011 Texas-New Mexico Power Company [Member] Affiliated Entity [Member]	Sep. 30, 2011 Texas-New Mexico Power Company [Member] Affiliated Entity [Member]	Oct. 31, 2011 PNM Resources [Member] Revolving credit facility [Member] Refinancing of Debt [Member]	Oct. 31, 2011 Public Service Company of New Mexico [Member] Revolving credit facility [Member] Refinancing of Debt [Member]	Oct. 30, 2011 PNM Resources [Member] Revolving credit facility [Member]	Sep. 30, 2011 PNM Resources [Member] Revolving credit facility [Member]	Dec. 31, 2010 PNM Resources [Member] Revolving credit facility [Member]	Sep. 30, 2011 PNM Resources [Member] Local lines of credit [Member]	Dec. 31, 2010 PNM Resources [Member] Local lines of credit [Member]	Sep. 30, 2011 Public Service Company of New Mexico [Member]	Dec. 31, 2010 Public Service Company of New Mexico [Member]	Oct. 30, 2011 Public Service Company of New Mexico [Member] Revolving credit facility [Member]	Sep. 30, 2011 Public Service Company of New Mexico [Member] Revolving credit facility [Member]	Dec. 31, 2010 Public Service Company of New Mexico [Member] Revolving credit facility [Member]	Sep. 30, 2011 Texas-New Mexico Power Company [Member]	Dec. 31, 2010 Texas-New Mexico Power Company [Member]	Sep. 30, 2011 Texas-New Mexico Power Company [Member] Revolving credit facility [Member]	Dec. 31, 2010 Texas-New Mexico Power Company [Member] Revolving credit facility [Member]	Sep. 30, 2011 Line of Credit [Member]	Dec. 31, 2010 Line of Credit [Member]
Short-term Debt [Line Items]
Proceeds from Related Party Debt					$ 63,800,000
Short-term debt – affiliate			63,800,000	0		5,400,000	0													0	1,200,000
Line of Credit Facility, Maximum Borrowing Capacity								300,000,000	400,000,000	517,000,000			5,000,000				368,000,000					75,000,000
Short-term debt	$ 289,000,000	$ 222,000,000									$ 32,000,000	$ 32,000,000	$ 0	$ 0	$ 257,000,000	$ 190,000,000		$ 257,000,000	$ 190,000,000			$ 0	$ 0	$ 289,000,000	$ 222,000,000

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Short Term Debt Due to Related Party

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

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The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 18

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 19

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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