XML 102 R76.htm IDEA: XBRL DOCUMENT
v3.22.1

Commitments and Contingencies - Coal Supply (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 17, 2022 $ / T | Nov. 09, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 31, 2016 USD ($)
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Other current assets |  |  |  | $ 1,082 | $ 1,635 |  |  |
PNM |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Other current assets |  |  |  | 995 | 1,456 |  |  |
PNM | Loss on long-term purchase commitment | Surface |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  | 66,600 | 67,400 |  |  |
PNM | Loss on long-term purchase commitment | Underground |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  | 28,300 | 27,900 |  |  |
PNM | Loss on long-term purchase commitment | San Juan Generating Station | Surface |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Estimate of possible loss |  |  |  | 72,900 |  |  |  |
PNM | Loss on long-term purchase commitment | San Juan Generating Station | Underground |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Estimate of possible loss |  |  |  | 34,900 |  |  |  |
Coal supply | San Juan Generating Station |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Cash used to support bank letter or credit arrangement |  |  |  |  |  |  |  | $ 30,300
Coal supply | Four Corners |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Payments for relief from obligations |  |  |  | 75,000 |  |  |  |
Coal supply | PNM | San Juan Generating Station |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Other current assets |  |  |  | 10,000 | 20,400 |  |  |
Increase in price of coal per ton | $ / T | 5.00 |  |  |  |  |  |  |
Coal supply | NM Capital | San Juan Generating Station |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Requirement to post reclamation bonds |  |  |  | 118,700 |  |  |  |
Cash used to support bank letter or credit arrangement |  |  |  | 30,300 |  |  |  |
Increase in coal mine decommissioning liability | PNM |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Regulatory disallowance, additional amount recorded |  |  |  |  |  |  | $ 800 |
Increase in coal mine decommissioning liability | PNM | Surface |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Regulatory disallowance, additional amount recorded |  |  | $ 3,600 |  |  |  |  |
Decrease in coal mine decommissioning liability | PNM | Underground |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Regulatory disallowance, additional amount recorded |  |  | $ 100 |  |  |  |  |
Decrease in coal mine decommissioning liability | PNM | Four Corners |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Regulatory disallowance, additional amount recorded |  |  |  |  |  | $ 2,500 |  |
Mine Reclamation Trust | PNM |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Required contribution to reclamation trust, current fiscal year |  |  |  | 7,000 |  |  |  |
Reclamation trust funding, year 2 |  |  |  | 0 |  |  |  |
Reclamation trust funding, year 3 |  |  |  | 0 |  |  |  |
Four Corners CSA | PNM |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Other commitment, due in first year |  |  |  |  | 2,200 |  |  |
Other commitment, due in second year |  |  |  | 2,100 |  |  |  |
Other commitment, due in third year |  |  |  | 2,100 |  |  |  |
Other commitment, due in fourth year |  |  |  | 2,100 |  |  |  |
San Juan Generating Station | Loss on long-term purchase commitment | PNM |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Annual funding post-term reclamation trust |  |  |  |  | $ 5,200 |  |  |
San Juan Generating Station | Coal-Fired Electricity Generating Facility Demolition And Remediation Ordinance | PNM |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Public Utilities, Initial Funding Requirement |  | $ 14,700 |  |  |  |  |  |
Loss Contingency, Surety Bond |  | $ 46,000 |  |  |  |  |  |
San Juan Generating Station and Four Corners | Mine Reclamation Trust | PNM |  |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |
Customer Reclamation Funding Cost, Maximum |  |  |  | $ 100,000 |  |  |  |

X
- Definition Cash used to support bank letter or credit arrangement + References No definition available. + Details
Name: | pnm_CashUsedToSupportBankLetterOrCreditArrangement
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Coal Mine Reclamation Bonds to be posted with NMMMD + References No definition available. + Details
Name: | pnm_CoalMineReclamationBondstobepostedwithNMMMD
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Customer Reclamation Funding Cost, Maximum + References No definition available. + Details
Name: | pnm_CustomerReclamationFundingCostMaximum
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase In Price Of Coal Per Ton + References No definition available. + Details
Name: | pnm_IncreaseInPriceOfCoalPerTon
Namespace Prefix: | pnm_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loss Contingency, Surety Bond + References No definition available. + Details
Name: | pnm_LossContingencySuretyBond
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Other Commitment, Due in First Year + References No definition available. + Details
Name: | pnm_OtherCommitmentDueinFirstYear
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Payments For Relief From Obligations + References No definition available. + Details
Name: | pnm_PaymentsForReliefFromObligations
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Public Utilities, Annual Funding Post-Term Reclamation Trust + References No definition available. + Details
Name: | pnm_PublicUtilitiesAnnualFundingPostTermReclamationTrust
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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, Initial Funding Requirement + References No definition available. + Details
Name: | pnm_PublicUtilitiesInitialFundingRequirement
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reclamation Trust Funding, Current Fiscal Year + References No definition available. + Details
Name: | pnm_ReclamationTrustFundingCurrentFiscalYear
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reclamation Trust Funding, Year 2 + References No definition available. + Details
Name: | pnm_ReclamationTrustFundingYear2
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reclamation Trust Funding, Year 3 + References No definition available. + Details
Name: | pnm_ReclamationTrustFundingYear3
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Regulatory Disallowance, Additional amount recorded + References No definition available. + Details
Name: | pnm_RegulatoryDisallowanceAdditionalAmountRecorded
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12021-110248 + Details
Name: | us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of current assets classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
Name: | us-gaap_OtherAssetsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of commitment classified as other to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | us-gaap_OtherCommitmentDueInFourthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of commitment classified as other to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | us-gaap_OtherCommitmentDueInSecondYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of commitment classified as other to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | us-gaap_OtherCommitmentDueInThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_LossOnLongTermPurchaseCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_ClassificationOfMineAxis=pnm_SurfaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pnm_ClassificationOfMineAxis=pnm_UndergroundMember
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_PurchaseCommitmentExcludingLongtermCommitmentAxis=pnm_CoalSupplyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

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

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

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

X
- Details
Name: | pnm_JointlyOwnedGeneratingFacilitiesAxis=pnm_SanJuanGeneratingStationAndFourCornersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |