XML 113 R122.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Commitments and Contingencies Commitments and Contingencies - Contingencies (Details) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2015 USD ($) Units Insurance_layers Procedures Sites reactors | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($)
Contingencies |  |  |
Nuclear liability insurance | $ 375,000 |  |
Assessment from licensees for each licensed reactor | $ 127,000 |  |
Number of licensed reactors in US | reactors | 102 |  |
Nuclear accident assessment limitation per year per unit | $ 19,000 |  |
Number of licensed nuclear units | Units | 6 |  |
Maximum assessment per nuclear incident | $ 764,000 |  |
Maximum payment required per accident in any one year | 114,000 |  |
maximum payment required per accident in any one year after addition of unit under construction | 133,000 |  |
Maximum assessment per nuclear incident after addition of unit under construction | 891,000 |  |
Total amount of protection available | $ 13,000,000 |  |
Surcharge for legal expenses | 5.00% |  |
The U.S. Congress is required to take action if these layes are exhausted | Insurance_layers | 2 |  |
Amount of property, decommissioning, and decontamination insurance carried | $ 5,100,000 |  |
Amount of insurance available for loss at any one site | $ 2,100,000 |  |
Number of sites | Sites | 1 |  |
Maximum amount of retrospective premiums | $ 127,000 |  |
Maximum idemnity if a covered accident tasks or keeps a nuclear unit offline | 490,000 |  |
Maximum amount of retrospective premiums | $ 36,000 |  |
Number of procedures for determining estimates for the costs of nuclear decommissioning | Procedures | 2 |  |
Amount spent to reduce emissions since 1970 | $ 6,200,000 |  |
Amount spent to reduce emissions | 315,000 | $ 378,000 | $ 197,000
Possible additional future costs for compliance with Clean Air Act requirements | 750,000 |  |
Amount of settlement for potential liability related to soil cleanup | 300 |  |
Amount of settlement for potential liability related to EPA study of site | 8 |  |
Remaining natural resource damages are less than | 1,000 |  |
Estimated liability for cleanup and similar environmental work on a non-discounted basis | 23,000 | $ 15,000 |
Decommissioning Fund Investments, Fair Value | 435,000 |  |
Nuclear Decommissioning Fund Investments, Fair Value | 1,500,000 |  |
Nuclear | Nuclear |  |  |
Contingencies |  |  |
Decommissioning Liability, Noncurrent | 2,200,000 |  |
Non-nuclear | Non-nuclear |  |  |
Contingencies |  |  |
Decommissioning Liability, Noncurrent | $ 1,700,000 |  |

X
- Definition The amount of property, decommissioning, and decontamination insurance available for loss at any one site to cover the cost of stabilizing or shutting down a reactor after an accident. + References No definition available. + Details
Name: | tve_AmountOfInsuranceAvailableForLossAtAnyOneSite
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of property, decommissioning, and decontamination insurance carried for nuclear plants owned to cover the cost of stabilizing or shutting down a reactor after an accident. + References No definition available. + Details
Name: | tve_AmountOfPropertyDecommissioningAndDecontaminationInsuranceCarried
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of the settlement for potential liability related to soil cleanup. + References No definition available. + Details
Name: | tve_AmountOfSettlementForPotentialLiabilityRelatedToSoilCleanup
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount spent to reduce emissions at power plants. + References No definition available. + Details
Name: | tve_AmountSpentToReduceEmissions
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of settlement for potential liability related to the EPA study of site. + References No definition available. + Details
Name: | tve_AmountofsettlementforpotentialliabilityrelatedtoEPAstudyofsite
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount spent since 1970 to reduce emissions at power plants. + References No definition available. + Details
Name: | tve_Amountspenttoreduceemissionssince1970
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition An assessment from licensees for each licensed nuclear reactor in the United States to fund the second layer, the Secondary Financial Program. + References No definition available. + Details
Name: | tve_AssessmentFromLicenseesForEachLicensedReactor
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Maximum assessment per nuclear incident. + References No definition available. + Details
Name: | tve_MaximumAssessmentPerNuclearIncident
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The maximum idemnity per unit if an accident covered by the policy tasks or keeps a nuclear unit offline. + References No definition available. + Details
Name: | tve_MaximumIdemnityIfCoveredAccidentTasksOrKeepsNuclearUnitOffline
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum payment that would be required per accident in any one year. + References No definition available. + Details
Name: | tve_MaximumPaymentRequiredPerAccidentInAnyOneYear
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum amount of retrospective premiums that may be required for property, decommissioning, and decontamination insurance. + References No definition available. + Details
Name: | tve_Maximumamountofretrospectivepremiums
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Maximum assessment per nuclear incident after addition of unit under construction + References No definition available. + Details
Name: | tve_Maximumassessmentpernuclearincidentafteradditionofunitunderconstruction
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition maximum payment required per accident in any one year after addition of unit under construction + References No definition available. + Details
Name: | tve_Maximumpaymentrequiredperaccidentinanyoneyearafteradditionofunitunderconstruction
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The per year per unit limitation of the assessment for any nuclear accident + References No definition available. + Details
Name: | tve_NuclearAccidentAssessmentLimitationPerYearPerUnit
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning nuclear facilities. + References No definition available. + Details
Name: | tve_NuclearDecommissioningFundInvestmentsFairValue
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition For the first layer of protection all NRC nuclear plant licensees purchase nuclear insurance from American Nuclear Insurers for each nuclear plant with an operating license. + References No definition available. + Details
Name: | tve_NuclearLiabilityInsurance
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of licensed nuclear units owned. + References No definition available. + Details
Name: | tve_NumberOfLicensedNuclearUnits
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of procedures for determining estimates for the costs of nuclear decommissioning + References No definition available. + Details
Name: | tve_NumberOfProceduresForDeterminingEstimatesForCostsOfNuclearDecommissioning
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of sites + References No definition available. + Details
Name: | tve_NumberOfSites
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of licensed reactors in US. + References No definition available. + Details
Name: | tve_NumberoflicensedreactorsinUS
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The possible additional future costs for compliance with Clean Air Act requirements. + References No definition available. + Details
Name: | tve_PossibleAdditionalFutureCostsForComplianceWithCleanAirActRequirements
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Remaining natural resource damages are less than + References No definition available. + Details
Name: | tve_RemainingNaturalResourceDamagesAreLessThan
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The maximum amount of retrospective premiums that could be required for accidental outage insurance. + References No definition available. + Details
Name: | tve_RetrospectivePremiums
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The surcharge for legal expenses. + References No definition available. + Details
Name: | tve_SurchargeForLegalExpenses
Namespace Prefix: | tve_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total amount of protection available to compensate for losses arising from a nuclear event in the United States. + References No definition available. + Details
Name: | tve_TotalAmountOfProtectionAvailable
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The U.S. Congress is required to take action to provide additional funds to cover the additional losses if these layes are exhausted. + References No definition available. + Details
Name: | tve_USCongressIsRequiredToTakeActionIfTheseLayesAreExhausted
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Undiscounted amount of the accrual for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 1 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingenciesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of a decommissioning liability associated with a legal obligation that a firm incurs when it constructs or operates an asset that must eventually be withdrawn from active service. This may include operating assets such as nuclear power plants or shipping vessels. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
Name: | us-gaap_DecommissioningLiabilityNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_DecommissioningTrustAssetsAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | tve_ReconciliationOfAssetRetirementObligationLiabilityAxis=tve_NuclearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | tve_ReconciliationOfAssetRetirementObligationLiabilityAxis=tve_NonNuclearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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