XML 28 R55.htm IDEA: XBRL DOCUMENT v3.2.0.727

Commitments and Contingencies - SJGS Matters (Details)	Jul. 31, 2015 MW	Jun. 30, 2015 MW	May. 19, 2015 MW	Apr. 08, 2015 MW	Jan. 22, 2015 USD ($)	Jan. 07, 2015 MW	Oct. 01, 2014 MW	Jun. 27, 2014 USD ($)	Jun. 26, 2014 USD ($) MW	Mar. 11, 2014 USD ($)	Dec. 20, 2013 MW
Clean Air Act, SNCR [Member] | San Juan Generating Station Unit 4 [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Public Utilities, Unsubscribed Ownership in Megawatts						65
Public Service Company of New Mexico [Member] | San Juan Generating Station Unit 4 [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Jointly Owned Utility Plan, Proposed Proportionate Ownership Share									64.50%
Public Service Company of New Mexico [Member] | San Juan Generating Station Units 1 and 4 [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Jointly Owned Utility Plan, Proposed Proportionate Ownership Share									58.70%
Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member] | San Juan Generating Station Unit 3 [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Percentage of ownership held by exiting owners		50.00%
Public Utilities, Ownership Percentage		50.00%
Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member] | San Juan Generating Station Unit 4 [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Percentage of ownership held by exiting owners		38.80%
Public Utilities, Ownership Percentage		38.50%
Public Utilities, Additional Ownership To Be Obtained, in Megawatts		132	132				132		132		78
Public Utilities, Costs to obtain additional ownership | $									$ 0
Public Service Company of New Mexico [Member] | Clean Air Act, SNCR [Member] | Installation Costs Including Construction Management, Gross Receipts Taxes, AFUDC, and Other PNM Costs [Member] | San Juan Generating Station Unit 4 [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Requested Expenditure, Installation Capital Costs | $					$ 76,600,000					$ 1,900,000
Requested Additional Expenditure, Installation Capital Costs | $								$ 6,400,000
Public Service Company of New Mexico [Member] | Clean Air Act, SNCR Hearing Examiner Recommended Denial [Member] | San Juan Generating Station Unit 4 [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Public Utilities, Additional Ownership To Be Obtained, in Megawatts				132
PNMR Development [Member] | Clean Air Act, SNCR [Member] | San Juan Generating Station Unit 4 [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Public Utilities, Potential Acquisition of Ownership in Megawatts		65	65			65
Subsequent Event [Member] | Public Service Company of New Mexico [Member] | Clean Air Act, SNCR Hearing Examiner Recommended Denial [Member] | San Juan Generating Station Unit 4 [Member]
Public Utilities, Commitments And Contingencies [Line Items]
Public Utilities, Additional Ownership To Be Obtained, in Megawatts	132

X

- Definition

Jointly Owned Utility Plan, Proposed Proportionate Ownership Share

+ References

No definition available.

+ Details

Name:	pnm_JointlyOwnedUtilityPlanProposedProportionateOwnershipShare
Namespace Prefix:	pnm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of ownership held by exiting owners

+ References

No definition available.

+ Details

Name:	pnm_Percentageofownershipheldbyexitingowners
Namespace Prefix:	pnm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Public Utilities, Additional Ownership To Be Obtained, in Megawatts

+ References

No definition available.

+ Details

Name:	pnm_PublicUtilitiesAdditionalOwnershipToBeObtainedinMegawatts
Namespace Prefix:	pnm_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Public Utilities, Commitments And Contingencies [Line Items]

+ References

No definition available.

+ Details

Name:	pnm_PublicUtilitiesCommitmentsAndContingenciesLineItems
Namespace Prefix:	pnm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Public Utilities, Costs to obtain additional ownership

+ References

No definition available.

+ Details

Name:	pnm_PublicUtilitiesCoststoobtainadditionalownership
Namespace Prefix:	pnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Public Utilities, Ownership Percentage

+ References

No definition available.

+ Details

Name:	pnm_PublicUtilitiesOwnershipPercentage
Namespace Prefix:	pnm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Public Utilities, Potential Acquisition of Ownership in Megawatts

+ References

No definition available.

+ Details

Name:	pnm_PublicUtilitiesPotentialAcquisitionofOwnershipinMegawatts
Namespace Prefix:	pnm_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Public Utilities, Unsubscribed Ownership in Megawatts

+ References

No definition available.

+ Details

Name:	pnm_PublicUtilitiesUnsubscribedOwnershipinMegawatts
Namespace Prefix:	pnm_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Requested Additional Expenditure, Installation Capital Costs

+ References

No definition available.

+ Details

Name:	pnm_RequestedAdditionalExpenditureInstallationCapitalCosts
Namespace Prefix:	pnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Requested Expenditure, Installation Capital Costs

+ References

No definition available.

+ Details

Name:	pnm_RequestedExpenditureInstallationCapitalCosts
Namespace Prefix:	pnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	pnm_CommitmentsAndContingenciesRelatedToEnvironmentAndOtherNatureAxis=pnm_CleanAirActSncrMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_JointlyOwnedUtilityPlantAxis=pnm_SanJuanGeneratingStationUnit4Member
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:	us-gaap_JointlyOwnedUtilityPlantAxis=pnm_SanJuanGeneratingStationUnits1And4Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_JointlyOwnedUtilityPlantAxis=pnm_SanJuanGeneratingStationUnit3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	pnm_PublicUtilitiesCommitmentsAndContingenciesByNatureOfExpenseAxis=pnm_InstallationCostsIncludingConstructionManagementGrossReceiptsTaxesAfudcAndOtherPnmCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	pnm_CommitmentsAndContingenciesRelatedToEnvironmentAndOtherNatureAxis=pnm_CleanAirActSNCRHearingExaminerRecommendedDenialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=pnm_PNMRDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: