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Pension and Other Postretirement Benefits Other Postretirement Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Retirement Plans, 401 (k) plan [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Expenses recognized	$ 16,703us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember	$ 16,785us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember	$ 16,185us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember
Other Retirement Plans, 401 (k) plan [Member] | Public Service Company of New Mexico [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Expenses recognized	12,745us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	12,952us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	12,427us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other Retirement Plans, 401 (k) plan [Member] | Texas-New Mexico Power Company [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Expenses recognized	3,958us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	3,953us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	3,739us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Other Retirement Plans, Key Employees, Non-qualified Plan [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Compensation expense	2,257us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember	2,204us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember	1,491us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember
Other Retirement Plans, Key Employees, Non-qualified Plan [Member] | Public Service Company of New Mexico [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Compensation expense	1,722us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	1,691us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember	1,143us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other Retirement Plans, Key Employees, Non-qualified Plan [Member] | Texas-New Mexico Power Company [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Compensation expense	$ 535us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	$ 513us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember	$ 327us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember

X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 30

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

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X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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X

- Details

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