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Capitalization, Financing Activities and Convertible Preferred Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 23, 2011 Series A Convertible Preferred Stock [Member]	Apr. 04, 2012 Request for Refinancing of Debt [Member] Public Service Company of New Mexico [Member]
Class of Stock [Line Items]
Debt Instrument, Requested Approval to Refinance Debt		$ 20.0
Preferred Stock, Agreement to purchase all outstanding shares related to convertible preferred stock	477,800
Convertible Preferred Stock, Shares Issued upon Conversion	10

X

- Definition

Debt Instrument, Requested Approval to Refinance Debt

+ References

No definition available.

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- Definition

Preferred Stock, Agreement to purchase all outstanding shares related to convertible preferred stock

+ References

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- Definition

Number of shares issued for each share of convertible preferred stock that is converted.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644



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-Name Accounting Standards Codification

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 02

-Paragraph 29



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 3, 4, 5, 6, 7, 8

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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