XML 88 R59.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Financing Schedule of Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Apr. 03, 2013 | Mar. 06, 2013
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | $ 1,975,090us-gaap_LongTermDebt | $ 1,745,420us-gaap_LongTermDebt |  |
Less current maturities | 333,066us-gaap_LongTermDebtCurrent | 75,000us-gaap_LongTermDebtCurrent |  |
Long-term Debt, Excluding Current Maturities | 1,642,024us-gaap_LongTermDebtNoncurrent | 1,670,420us-gaap_LongTermDebtNoncurrent |  |
Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 9.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Unsecured Debt [Member] | Senior unsecured notes, 9.25% due 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 118,766us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNoteDue2015At9Point25PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 118,766us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNoteDue2015At9Point25PercentMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Public Service Company of New Mexico [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | 1,490,657us-gaap_LongTermDebt / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,290,618us-gaap_LongTermDebt / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Less current maturities | 214,300us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 75,000us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Long-term Debt, Excluding Current Maturities | 1,276,357us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,215,618us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember |  |
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 4.875% due 2033 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 146,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotePcrbDue2033At4Point875PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 146,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotePcrbDue2033At4Point875PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotePcrbDue2033At4Point875PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotePcrbDue2033At4Point875PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 6.25% due 2038 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 36,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotePcrbDue2038At6Point25PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 36,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotePcrbDue2038At6Point25PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotePcrbDue2038At6Point25PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotePcrbDue2038At6Point25PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 4.75% due 2040, mandatory tender at June 1, 2017 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 37,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotePcrbDue2040At4Point75PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 37,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotePcrbDue2040At4Point75PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotePcrbDue2040At4Point75PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotePcrbDue2040At4Point75PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 5.20% due 2040, mandatory tender at June 1, 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 40,045us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2040At5Point20PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 40,045us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2040At5Point20PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2040At5Point20PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 5.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2040At5Point20PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 5.90% due 2040 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 255,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2040At5Point90PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 255,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2040At5Point90PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.90%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2040At5Point90PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 5.90%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2040At5Point90PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 6.25% due 2040 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 11,500us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2040At6Point25PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 11,500us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2040At6Point25PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2040At6Point25PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2040At6Point25PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 2.54% due 2042, mandatory tender at June 1, 2017 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 20,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPCRBDue2042at2Point54percentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 20,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPCRBDue2042at2Point54percentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.54%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPCRBDue2042at2Point54percentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 2.54%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPCRBDue2042at2Point54percentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 4.00% due 2043, mandatory tender at June 1, 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 39,300us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2043At4PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 39,300us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2043At4PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2043At4PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2043At4PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Public Service Company of New Mexico [Member] | Senior Unsecured Notes, Pollution Control Revenue Bonds [Member] | 5.20% due 2043, mandatory tender at June 1, 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 21,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2043At5Point20PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 21,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2043At5Point20PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2043At5Point20PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember | 5.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesPcrbDue2043At5Point20PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = pnm_SeniorUnsecuredNotesPollutionControlRevenueBondsMember |  |
Public Service Company of New Mexico [Member] | Unsecured Debt [Member] | 7.95% due 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 350,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesDue2018At7Point95PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 350,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesDue2018At7Point95PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesDue2018At7Point95PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 7.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesDue2018At7Point95PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Public Service Company of New Mexico [Member] | Unsecured Debt [Member] | 7.50% due 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 100,025us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesDue2018At7Point50PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 100,025us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesDue2018At7Point50PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesDue2018At7Point50PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesDue2018At7Point50PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Public Service Company of New Mexico [Member] | Unsecured Debt [Member] | 5.35% due 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 160,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesDue2021At5Point35PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 160,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesDue2021At5Point35PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.35%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesDue2021At5Point35PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 5.35%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNotesDue2021At5Point35PercentMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Public Service Company of New Mexico [Member] | Unsecured Debt [Member] | PNM 2014 Term Loan Agreement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | 0us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pnm_PNM2014TermLoanAgreementMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 75,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pnm_PNM2014TermLoanAgreementMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Public Service Company of New Mexico [Member] | Unsecured Debt [Member] | PNM Term Loan Agreement due 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | 175,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pnm_PNMTermLoanAgreementdue2015Member / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 0us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pnm_PNMTermLoanAgreementdue2015Member / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Public Service Company of New Mexico [Member] | Unsecured Debt [Member] | PNM Multi-Draw Term Loan Agreement due 2016 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | 100,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pnm_PNMMultiDrawTermLoanAgreementdue2016Member / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 0us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pnm_PNMMultiDrawTermLoanAgreementdue2016Member / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |
Public Service Company of New Mexico [Member] | Other [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized premiums (discounts) | (213)us-gaap_DebtInstrumentUnamortizedDiscount / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_OtherDebtSecuritiesMember | (252)us-gaap_DebtInstrumentUnamortizedDiscount / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_OtherDebtSecuritiesMember |  |
Texas-New Mexico Power Company [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | 365,667us-gaap_LongTermDebt / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 336,036us-gaap_LongTermDebt / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  |
Less current maturities | 0us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 0us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  |
Long-term Debt, Excluding Current Maturities | 365,667us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 336,036us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember |  |
Texas-New Mexico Power Company [Member] | First Mortgage Bonds [Member] | 2011 Term Loan Agreement, due 2014 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt | 0us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pnm_A2011TermLoanAgreementFirstMortgageBondsDue2014Member / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember | 50,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pnm_A2011TermLoanAgreementFirstMortgageBondsDue2014Member / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember |  |
Texas-New Mexico Power Company [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds Due 2014, Series 2009A, at 9 point 50 percent [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 172,302us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBondsDue2014Series2009AAt9Point50PercentMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember | 172,302us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBondsDue2014Series2009AAt9Point50PercentMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 9.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBondsDue2014Series2009AAt9Point50PercentMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember | 9.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBondsDue2014Series2009AAt9Point50PercentMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember | 9.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBondsDue2014Series2009AAt9Point50PercentMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember | 9.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBondsDue2014Series2009AAt9Point50PercentMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember
Texas-New Mexico Power Company [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds 6 Point 95 Percent, due 2043, Series 2013A [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 93,198us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBonds6Point95PercentDue2043Series2013AMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember | 93,198us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBonds6Point95PercentDue2043Series2013AMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBonds6Point95PercentDue2043Series2013AMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember | 6.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBonds6Point95PercentDue2043Series2013AMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember | 6.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBonds6Point95PercentDue2043Series2013AMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember | 6.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBonds6Point95PercentDue2043Series2013AMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember
Texas-New Mexico Power Company [Member] | First Mortgage Bonds [Member] | First Mortgage Bonds Due 2024, Series 2014A, at 4 point 03 percent [Member] [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Long-term Debt, Noncurrent | 80,000us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBondsDue2024Series2014Aat4point03percentMemberMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember | 0us-gaap_UnsecuredLongTermDebt / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBondsDue2024Series2014Aat4point03percentMemberMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.03%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_FirstMortgageBondsDue2024Series2014Aat4point03percentMemberMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = pnm_FirstMortgageBondsMember |  |  |
Texas-New Mexico Power Company [Member] | Other [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized premiums (discounts) | (20,167)us-gaap_DebtInstrumentUnamortizedDiscount / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_OtherDebtSecuritiesMember | (20,536)us-gaap_DebtInstrumentUnamortizedDiscount / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_OtherDebtSecuritiesMember |  |
PNMR [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Less current maturities | 118,766us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = pnm_PnmrMember | 0us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = pnm_PnmrMember |  |
Long-term Debt, Excluding Current Maturities | $ 0us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = pnm_PnmrMember | $ 118,766us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = pnm_PnmrMember |  |
PNMR [Member] | Unsecured Debt [Member] | Senior unsecured notes, 9.25% due 2015 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 9.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNoteDue2015At9Point25PercentMember / dei_LegalEntityAxis = pnm_PnmrMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 9.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pnm_SeniorUnsecuredNoteDue2015At9Point25PercentMember / dei_LegalEntityAxis = pnm_PnmrMember / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
Name: | us-gaap_LongTermDebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_LongTermDebtNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_UnsecuredLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=pnm_PnmrMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=pnm_PublicServiceCompanyOfNewMexicoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=pnm_TexasNewMexicoPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |