XML 87 R62.htm IDEA: XBRL DOCUMENT
v3.20.1

Regulatory and Rate Matters - SJGS Abandonment Application (Details) $ in Millions | Apr. 01, 2020 USD ($) | Jul. 01, 2019 USD ($) scenario MW | May 31, 2019 MW | Mar. 31, 2020 USD ($) MW | Mar. 27, 2020 MMBTU MW | Feb. 21, 2020 USD ($) | Jun. 14, 2019
--- | --- | --- | --- | --- | --- | --- | ---
PNM Solar Direct |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Solar generation capacity (in megawatts) | MW |  |  | 50 |  |  |  |
Power purchase agreement term |  |  | 15 years |  |  |  |
Required Percentage by 2020 | Energy Transition Act | Electric-Generation Portfolio Standard |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Renewable energy, percentage |  |  |  |  |  |  | 0.20
Required Percentage by 2025 | Energy Transition Act | Electric-Generation Portfolio Standard |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Renewable energy, percentage |  |  |  |  |  |  | 0.40
Required Percentage by 2030 | Energy Transition Act | Electric-Generation Portfolio Standard |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Renewable energy, percentage |  |  |  |  |  |  | 0.50
Required Percentage by 2040 | Energy Transition Act | Electric-Generation Portfolio Standard |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Renewable energy, percentage |  |  |  |  |  |  | 0.80
Required Percentage by 2045 | Energy Transition Act | Electric-Generation Portfolio Standard |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Renewable energy, percentage |  |  |  |  |  |  | 1
PNM |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Number of megawatts in battery storage facilities (in megawatts) | MW |  |  |  |  | 40 |  |
Solar generation capacity (in megawatts) | MW |  |  |  |  | 300 |  |
Solar generation capacity, power purchase agreements (in Megawatts) | MMBTU |  |  |  |  | 20 |  |
PNM | Renewable Portfolio Standard |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Solar generation capacity (in megawatts) | MW |  |  |  | 133.0 |  |  |
PNM | PNM Solar Direct |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Solar generation capacity (in megawatts) | MW |  |  |  |  | 50 |  |
PNM | Required Percentage by 2011 | Renewable Portfolio Standard |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Required percentage of renewable energy in portfolio to electric sales |  |  |  | 10.00% |  |  |
PNM | Required Percentage by 2015 | Renewable Portfolio Standard |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Required percentage of renewable energy in portfolio to electric sales |  |  |  | 15.00% |  |  |
PNM | Required Percentage by 2020 | Renewable Portfolio Standard |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Required percentage of renewable energy in portfolio to electric sales |  |  |  | 20.00% |  |  |
San Juan Generating Station | Other deferred credits |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Restructuring reserve |  |  |  | $ 38.1 |  |  |
San Juan Generating Station | Employee Severance |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Restructuring reserve |  |  |  | 9.4 |  |  |
San Juan Generating Station | PNM |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Number of megawatts in natural gas-fired peaking plant (in megawatts) | MW |  | 280 |  |  |  |  |
Number of megawatts in battery storage facilities (in megawatts) | MW |  | 70 |  |  |  |  |
Solar generation capacity (in megawatts) | MW |  | 350 |  |  |  |  |
Number of megawatts in battery storage facilities, replacement resource scenario (in megawatts) | MW |  | 60 |  |  |  |  |
Number of replacement resource scenarios | scenario |  | 3 |  |  |  |  |
Request issuance of energy transition bonds |  | $ 361.0 |  |  |  |  |
Forecasted undepreciated investment |  | 283.0 |  |  |  | $ 361.0 |
Plant decommissioning and coal mine reclamation costs |  | 28.6 |  |  |  |  |
Upfront financing costs |  | 9.6 |  |  |  |  |
Severance costs |  | 20.0 |  |  |  |  |
Proceeds from securitization bonds |  | $ 19.8 |  |  |  |  |
San Juan Generating Station | PNM | Other deferred credits |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Restructuring reserve |  |  |  | 36.8 |  |  |
San Juan Generating Station | PNM | Employee Severance |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Restructuring reserve |  |  |  | 8.1 |  |  |
San Juan Generating Station | PNM | Other Restructuring |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Restructuring reserve |  |  |  | 8.9 |  |  |
San Juan Generating Station | PNM | Economic Development and Workforce Training Costs |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Restructuring reserve |  |  |  | $ 19.8 |  |  |
Subsequent event | San Juan Generating Station | PNM |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |
Request issuance of energy transition bonds | $ 361.0 |  |  |  |  |  |

X
- Definition Power Purchase Agreement Term + References No definition available. + Details
Name: | pnm_PowerPurchaseAgreementTerm
Namespace Prefix: | pnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proceeds From Securitization Bonds + References No definition available. + Details
Name: | pnm_ProceedsFromSecuritizationBonds
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, forecasted undepreciated investment + References No definition available. + Details
Name: | pnm_PublicUtilitiesForecastedUndepreciatedInvestment
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Public Utilities, Number Of Megawatts In Battery Storage Facilities + References No definition available. + Details
Name: | pnm_PublicUtilitiesNumberOfMegawattsInBatteryStorageFacilities
Namespace Prefix: | pnm_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Number Of Megawatts In Battery Storage Facilities, Replacement Resource Scenario + References No definition available. + Details
Name: | pnm_PublicUtilitiesNumberOfMegawattsInBatteryStorageFacilitiesReplacementResourceScenario
Namespace Prefix: | pnm_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Number Of Megawatts In Natural Gas-Fired Peaking Plant + References No definition available. + Details
Name: | pnm_PublicUtilitiesNumberOfMegawattsInNaturalGasFiredPeakingPlant
Namespace Prefix: | pnm_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Number Of Replacement Resource Scenarios + References No definition available. + Details
Name: | pnm_PublicUtilitiesNumberOfReplacementResourceScenarios
Namespace Prefix: | pnm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Plant Decommissioning And Coal Mine Reclamation Costs + References No definition available. + Details
Name: | pnm_PublicUtilitiesPlantDecommissioningAndCoalMineReclamationCosts
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Public Utilities, Renewable Energy, Percentage + References No definition available. + Details
Name: | pnm_PublicUtilitiesRenewableEnergyPercentage
Namespace Prefix: | pnm_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Request Issuance Of Energy Transition Bonds + References No definition available. + Details
Name: | pnm_PublicUtilitiesRequestIssuanceOfEnergyTransitionBonds
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Regulated Operations, Required Percentage of Renewable Energy in Portfolio to Electric Sales + References No definition available. + Details
Name: | pnm_PublicUtilitiesRequiredPercentageOfRenewableEnergyInPortfolioToElectricSales
Namespace Prefix: | pnm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Solar generation capacity in Megawatts + References No definition available. + Details
Name: | pnm_PublicUtilitiesSolarGenerationCapacityInMegawatts
Namespace Prefix: | pnm_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Solar Generation Capacity, Power Purchase Agreement, in Megawatts + References No definition available. + Details
Name: | pnm_PublicUtilitiesSolarGenerationCapacityPowerPurchaseAgreementInMegawatts
Namespace Prefix: | pnm_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Upfront Financing Costs + References No definition available. + Details
Name: | pnm_PublicUtilitiesUpfrontFinancingCosts
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
Name: | us-gaap_SeveranceCosts1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | pnm_ScheduleOfRegulatoryRateMattersAxis=pnm_PNMSolarDirectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_DateOfRegulatoryActionAxis=pnm_RequiredPercentageBy2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_CommitmentsAndContingenciesRelatedToEnvironmentAndOtherNatureAxis=pnm_EnergyTransitionActMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_ScheduleOfRegulatoryRateMattersAxis=pnm_ElectricGenerationPortfolioStandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_DateOfRegulatoryActionAxis=pnm_RequiredPercentageby2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_DateOfRegulatoryActionAxis=pnm_RequiredPercentageby2030Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_DateOfRegulatoryActionAxis=pnm_RequiredPercentageby2040Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_DateOfRegulatoryActionAxis=pnm_RequiredPercentageby2045Member
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: | pnm_ScheduleOfRegulatoryRateMattersAxis=pnm_RenewablePortfolioStandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_DateOfRegulatoryActionAxis=pnm_RequiredPercentageBy2011Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_DateOfRegulatoryActionAxis=pnm_RequiredPercentageBy2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=pnm_SanJuanGeneratingStationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=pnm_OtherDeferredCreditsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_OtherRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=pnm_EconomicDevelopmentAndWorkforceTrainingCostsMember
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: |