XML 105 R80.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Income Taxes Interest Expense (Income) Related to Income Taxes (Details) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Taxes [Line Items] |  |  |  |
New Mexico Corporate tax rate, current |  | 7.60% |  |
Interest income related to income taxes |  | $ 242,000 | $ 243,000 | $ 467,000
New Mexico Corporate tax rate, 2014 |  | 5.90% |  |
Increase in regulatory liabilities due to change in state corporate tax rate |  | 23,900,000 |  |
Increase in income tax expense due to change in state corporate tax rate |  | 1,200,000 |  |
Additional Income Tax Expense, Impairment of NM Wind Credits |  | 2,400,000 | 700,000 |
Federal Tax Refund | 96,200,000 |  |  |
Public Service Company of New Mexico [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Interest income related to income taxes |  | 251,000 | 244,000 | 401,000
Federal Tax Refund | 77,400,000 |  |  |
Texas-New Mexico Power Company [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Interest income related to income taxes |  | $ (2,000) | $ (3,000) | $ 2,000

X
- Definition Additional Income Tax Expense, Impairment of NM Wind Credits + References No definition available. + Details
Name: | pnm_AdditionalIncomeTaxExpenseImpairmentofNMWindCredits
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Federal Tax Refund + References No definition available. + Details
Name: | pnm_FederalTaxRefund
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | pnm_IncomeTaxesLineItems
Namespace Prefix: | pnm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase in income tax expense due to change in state corporate tax rate + References No definition available. + Details
Name: | pnm_Increaseinincometaxexpenseduetochangeinstatecorporatetaxrate
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase in regulatory liabilities due to change in state corporate tax rate + References No definition available. + Details
Name: | pnm_Increaseinregulatoryliabilitiesduetochangeinstatecorporatetaxrate
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition New Mexico Corporate tax rate, 2014 + References No definition available. + Details
Name: | pnm_NewMexicoCorporatetaxrate2014
Namespace Prefix: | pnm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition New Mexico Corporate tax rate, current + References No definition available. + Details
Name: | pnm_NewMexicoCorporatetaxratecurrent
Namespace Prefix: | pnm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of interest expense for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration