XML 126 R95.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Construction Program and Jointly-Owned Electric Generating Plants - Summary of Budgeted Construction Expenditures (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) MW
Summary of Budgeted Construction Expenditures [Line Items] |
2017 | $ 517.3
2018 | 395.0
2019 | 434.6
2020 | 403.9
2021 | 332.3
Total | $ 2,083.1
Solar [Member] |
Summary of Budgeted Construction Expenditures [Line Items] |
Public Utilities, Number of Megawatts | MW | 30
Gas-fired [Member] |
Summary of Budgeted Construction Expenditures [Line Items] |
Public Utilities, Number of Megawatts | MW | 40
Public Service Company of New Mexico [Member] |
Summary of Budgeted Construction Expenditures [Line Items] |
2017 | $ 308.1
2018 | 231.0
2019 | 282.2
2020 | 252.5
2021 | 190.7
Total | 1,264.5
Public Service Company of New Mexico [Member] | Solar [Member] |
Summary of Budgeted Construction Expenditures [Line Items] |
2017 | 46.9
Public Service Company of New Mexico [Member] | Gas-fired [Member] |
Summary of Budgeted Construction Expenditures [Line Items] |
2017 | 43.7
Public Service Company of New Mexico [Member] | Four Corners Units 4 and 5 (Coal) [Member] |
Summary of Budgeted Construction Expenditures [Line Items] |
Expenditures related to environmental upgrades | 44.2
Texas-New Mexico Power Company [Member] |
Summary of Budgeted Construction Expenditures [Line Items] |
2017 | 151.0
2018 | 134.3
2019 | 137.1
2020 | 136.2
2021 | 126.2
Total | 684.8
Other Subsidiaries [Member] |
Summary of Budgeted Construction Expenditures [Line Items] |
2017 | 58.2
2018 | 29.7
2019 | 15.3
2020 | 15.2
2021 | 15.4
Total | $ 133.8

X
- Definition Budgeted Future Construction Expenditures, Year Five + References No definition available. + Details
Name: | pnm_BudgetedFutureConstructionExpendituresYearFive
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Budgeted Future Construction Expenditures, Year Four + References No definition available. + Details
Name: | pnm_BudgetedFutureConstructionExpendituresYearFour
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Budgeted Future Construction Expenditures, Year One + References No definition available. + Details
Name: | pnm_BudgetedFutureConstructionExpendituresYearOne
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Budgeted Future Construction Expenditures, Year Three + References No definition available. + Details
Name: | pnm_BudgetedFutureConstructionExpendituresYearThree
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Budgeted Future Construction Expenditures, Year Two + References No definition available. + Details
Name: | pnm_BudgetedFutureConstructionExpendituresYearTwo
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Environmental Upgrades Requirement Estimates + References No definition available. + Details
Name: | pnm_EnvironmentalUpgradesRequirementEstimates
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Number of Megawatts + References No definition available. + Details
Name: | pnm_PublicUtilitiesNumberofMegawatts
Namespace Prefix: | pnm_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Summary of Budgeted Construction Expenditures [Line Items] + References No definition available. + Details
Name: | pnm_SummaryOfBudgetedConstructionExpendituresLineItems
Namespace Prefix: | pnm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total Budgeted Construction Expenditures + References No definition available. + Details
Name: | pnm_TotalBudgetedConstructionExpenditures
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_EnergyAxis=pnm_SolarEnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnergyAxis=us-gaap_NaturalGasReservesMember
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_FourCornersUnits4And5CoalMember
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: | dei_LegalEntityAxis=pnm_OtherSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |