P1YP3Y031830000043238000130170006782000false--09-30FY201900007318021.801.942.100.0050.0052000000002000000001112736831193389251112736831193389250.06670.06750.0850.030.05950.0550.04150.041250.06670.0430.06750.0850.030.05950.0550.04150.041250.04125P5Y7167000.150.550.20.200.300.350.100.056841000001021500000P1YP2Y147300014600064000 0000731802 2018-10-01 2019-09-30 0000731802 2019-11-06 0000731802 2019-03-31 0000731802 stpr:VA 2018-10-01 2019-09-30 0000731802 2019-09-30 0000731802 2018-09-30 0000731802 2017-10-01 2018-09-30 0000731802 us-gaap:NaturalGasUsRegulatedMember 2016-10-01 2017-09-30 0000731802 2016-10-01 2017-09-30 0000731802 us-gaap:OperatingSegmentsMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2017-10-01 2018-09-30 0000731802 us-gaap:IntersegmentEliminationMember us-gaap:NaturalGasUsRegulatedMember 2017-10-01 2018-09-30 0000731802 us-gaap:OperatingSegmentsMember ato:DistributionSegmentMember 2016-10-01 2017-09-30 0000731802 us-gaap:OperatingSegmentsMember us-gaap:NaturalGasUsRegulatedMember ato:PipelineandStorageSegmentMember 2018-10-01 2019-09-30 0000731802 us-gaap:OperatingSegmentsMember ato:DistributionSegmentMember 2017-10-01 2018-09-30 0000731802 us-gaap:OperatingSegmentsMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 us-gaap:OperatingSegmentsMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 us-gaap:NaturalGasUsRegulatedMember 2017-10-01 2018-09-30 0000731802 2014-10-01 2014-12-31 0000731802 us-gaap:OperatingSegmentsMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2016-10-01 2017-09-30 0000731802 us-gaap:OperatingSegmentsMember us-gaap:NaturalGasUsRegulatedMember ato:PipelineandStorageSegmentMember 2017-10-01 2018-09-30 0000731802 us-gaap:OperatingSegmentsMember us-gaap:NaturalGasUsRegulatedMember ato:PipelineandStorageSegmentMember 2016-10-01 2017-09-30 0000731802 us-gaap:IntersegmentEliminationMember 2016-10-01 2017-09-30 0000731802 us-gaap:OperatingSegmentsMember ato:PipelineandStorageSegmentMember 2016-10-01 2017-09-30 0000731802 us-gaap:IntersegmentEliminationMember us-gaap:NaturalGasUsRegulatedMember 2016-10-01 2017-09-30 0000731802 us-gaap:OperatingSegmentsMember ato:PipelineandStorageSegmentMember 2017-10-01 2018-09-30 0000731802 us-gaap:IntersegmentEliminationMember us-gaap:NaturalGasUsRegulatedMember 2018-10-01 2019-09-30 0000731802 us-gaap:NaturalGasUsRegulatedMember 2018-10-01 2019-09-30 0000731802 us-gaap:IntersegmentEliminationMember 2018-10-01 2019-09-30 0000731802 us-gaap:IntersegmentEliminationMember 2017-10-01 2018-09-30 0000731802 us-gaap:OperatingSegmentsMember ato:PipelineandStorageSegmentMember 2018-10-01 2019-09-30 0000731802 us-gaap:AdditionalPaidInCapitalMember 2017-09-30 0000731802 us-gaap:CommonStockMember 2016-10-01 2017-09-30 0000731802 us-gaap:CommonStockMember 2017-10-01 2018-09-30 0000731802 us-gaap:CommonStockMember 2016-09-30 0000731802 us-gaap:CommonStockMember 2018-10-01 2019-09-30 0000731802 us-gaap:AdditionalPaidInCapitalMember 2017-10-01 2018-09-30 0000731802 us-gaap:RetainedEarningsMember 2016-10-01 2017-09-30 0000731802 us-gaap:AdditionalPaidInCapitalMember 2018-10-01 2019-09-30 0000731802 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2017-10-01 2018-09-30 0000731802 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2016-09-30 0000731802 us-gaap:RetainedEarningsMember 2016-09-30 0000731802 us-gaap:AdditionalPaidInCapitalMember 2016-10-01 2017-09-30 0000731802 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2016-10-01 2017-09-30 0000731802 us-gaap:RetainedEarningsMember 2018-10-01 2019-09-30 0000731802 us-gaap:CommonStockMember 2017-09-30 0000731802 us-gaap:RetainedEarningsMember 2018-09-30 0000731802 us-gaap:RetainedEarningsMember 2017-10-01 2018-09-30 0000731802 us-gaap:CommonStockMember 2019-09-30 0000731802 2017-09-30 0000731802 us-gaap:CommonStockMember 2018-09-30 0000731802 us-gaap:AdditionalPaidInCapitalMember 2019-09-30 0000731802 2016-09-30 0000731802 us-gaap:RetainedEarningsMember 2017-09-30 0000731802 us-gaap:AdditionalPaidInCapitalMember 2018-09-30 0000731802 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-09-30 0000731802 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2017-09-30 0000731802 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-09-30 0000731802 us-gaap:RetainedEarningsMember 2019-09-30 0000731802 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-10-01 2019-09-30 0000731802 us-gaap:AdditionalPaidInCapitalMember 2016-09-30 0000731802 us-gaap:OtherCurrentLiabilitiesMember us-gaap:DeferredIncomeTaxChargesMember 2018-09-30 0000731802 us-gaap:OtherCurrentLiabilitiesMember us-gaap:DeferredIncomeTaxChargesMember 2019-09-30 0000731802 ato:PipelineandStorageSegmentMember 2018-10-01 2019-09-30 0000731802 2018-10-01 0000731802 us-gaap:RemovalCostsMember 2019-09-30 0000731802 us-gaap:DeferredIncomeTaxChargesMember 2019-09-30 0000731802 us-gaap:DeferredIncomeTaxChargesMember 2018-09-30 0000731802 us-gaap:OtherRegulatoryAssetsLiabilitiesMember 2019-09-30 0000731802 ato:RegulatoryCostofServiceReserveMember 2019-09-30 0000731802 ato:RateCaseCostsMember 2019-09-30 0000731802 us-gaap:AssetRetirementObligationCostsMember 2019-09-30 0000731802 us-gaap:OtherRegulatoryAssetsLiabilitiesMember 2018-09-30 0000731802 us-gaap:DeferredProjectCostsMember 2018-09-30 0000731802 us-gaap:DeferredFuelCostsMember 2018-09-30 0000731802 us-gaap:DeferredProjectCostsMember 2019-09-30 0000731802 us-gaap:LossOnReacquiredDebtMember 2018-09-30 0000731802 us-gaap:PensionAndOtherPostretirementPlansCostsMember 2019-09-30 0000731802 us-gaap:OtherRegulatoryAssetsLiabilitiesMember 2019-09-30 0000731802 us-gaap:LossOnReacquiredDebtMember 2019-09-30 0000731802 us-gaap:PensionAndOtherPostretirementPlansCostsMember 2018-09-30 0000731802 ato:InfrastructureMechanismsMember 2019-09-30 0000731802 ato:RegulatoryCostofServiceReserveMember 2018-09-30 0000731802 ato:InfrastructureMechanismsMember 2018-09-30 0000731802 us-gaap:PensionAndOtherPostretirementPlansCostsMember 2019-09-30 0000731802 ato:RegulatoryClauseRevenuesOverRecoveredMember 2019-09-30 0000731802 us-gaap:DeferredFuelCostsMember 2019-09-30 0000731802 us-gaap:AssetRetirementObligationCostsMember 2018-09-30 0000731802 us-gaap:RemovalCostsMember 2018-09-30 0000731802 ato:RegulatoryClauseRevenuesOverRecoveredMember 2018-09-30 0000731802 ato:RateCaseCostsMember 2018-09-30 0000731802 us-gaap:DeferredFuelCostsMember 2018-09-30 0000731802 us-gaap:DeferredFuelCostsMember 2019-09-30 0000731802 us-gaap:OtherRegulatoryAssetsLiabilitiesMember 2018-09-30 0000731802 us-gaap:PensionAndOtherPostretirementPlansCostsMember 2018-09-30 0000731802 ato:PipelineandStorageSegmentMember us-gaap:IntersubsegmentEliminationsMember 2017-10-01 2018-09-30 0000731802 ato:DistributionSegmentMember us-gaap:IntersubsegmentEliminationsMember 2017-10-01 2018-09-30 0000731802 us-gaap:IntersegmentEliminationMember us-gaap:ReportableSubsegmentsMember 2017-10-01 2018-09-30 0000731802 us-gaap:IntersubsegmentEliminationsMember 2017-10-01 2018-09-30 0000731802 us-gaap:IntersegmentEliminationMember us-gaap:IntersubsegmentEliminationsMember 2017-10-01 2018-09-30 0000731802 ato:PipelineandStorageSegmentMember us-gaap:ReportableSubsegmentsMember 2017-10-01 2018-09-30 0000731802 us-gaap:ReportableSubsegmentsMember 2017-10-01 2018-09-30 0000731802 ato:DistributionSegmentMember us-gaap:ReportableSubsegmentsMember 2017-10-01 2018-09-30 0000731802 us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2016-10-01 2017-09-30 0000731802 ato:DistributionSegmentMember 2017-10-01 2018-09-30 0000731802 us-gaap:NaturalGasGatheringTransportationMarketingAndProcessingMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 ato:ResidentialCustomersMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2017-10-01 2018-09-30 0000731802 ato:ResidentialCustomersMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2016-10-01 2017-09-30 0000731802 us-gaap:NaturalGasGatheringTransportationMarketingAndProcessingMember ato:DistributionSegmentMember 2016-10-01 2017-09-30 0000731802 ato:PublicAuthorityandOtherCustomersMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2016-10-01 2017-09-30 0000731802 ato:PipelineandStorageSegmentMember 2017-10-01 2018-09-30 0000731802 ato:CommercialCustomersMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2017-10-01 2018-09-30 0000731802 us-gaap:NaturalGasGatheringTransportationMarketingAndProcessingMember ato:DistributionSegmentMember 2017-10-01 2018-09-30 0000731802 ato:DistributionSegmentMember 2016-10-01 2017-09-30 0000731802 ato:IndustrialCustomersMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2016-10-01 2017-09-30 0000731802 us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2017-10-01 2018-09-30 0000731802 ato:CommercialCustomersMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2016-10-01 2017-09-30 0000731802 us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 ato:IndustrialCustomersMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 ato:IndustrialCustomersMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2017-10-01 2018-09-30 0000731802 ato:PipelineandStorageSegmentMember 2016-10-01 2017-09-30 0000731802 ato:CommercialCustomersMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 ato:PublicAuthorityandOtherCustomersMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2017-10-01 2018-09-30 0000731802 ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 ato:ResidentialCustomersMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 ato:PublicAuthorityandOtherCustomersMember us-gaap:NaturalGasUsRegulatedMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 us-gaap:OperatingSegmentsMember ato:DistributionSegmentMember 2019-09-30 0000731802 us-gaap:IntersegmentEliminationMember us-gaap:IntersegmentEliminationMember 2019-09-30 0000731802 us-gaap:OperatingSegmentsMember ato:PipelineandStorageSegmentMember 2019-09-30 0000731802 us-gaap:OperatingSegmentsMember ato:PipelineandStorageSegmentMember 2018-09-30 0000731802 us-gaap:OperatingSegmentsMember ato:DistributionSegmentMember 2018-09-30 0000731802 us-gaap:IntersegmentEliminationMember us-gaap:IntersegmentEliminationMember 2018-09-30 0000731802 us-gaap:OperatingSegmentsMember ato:NaturalGasMarketingSegmentMember 2016-10-01 2017-09-30 0000731802 us-gaap:ReportableSubsegmentsMember 2016-10-01 2017-09-30 0000731802 ato:NaturalGasMarketingSegmentMember us-gaap:IntersubsegmentEliminationsMember 2016-10-01 2017-09-30 0000731802 ato:PipelineandStorageSegmentMember us-gaap:IntersubsegmentEliminationsMember 2016-10-01 2017-09-30 0000731802 ato:PipelineandStorageSegmentMember us-gaap:ReportableSubsegmentsMember 2016-10-01 2017-09-30 0000731802 us-gaap:IntersegmentEliminationMember us-gaap:IntersubsegmentEliminationsMember 2016-10-01 2017-09-30 0000731802 ato:NaturalGasMarketingSegmentMember us-gaap:ReportableSubsegmentsMember 2016-10-01 2017-09-30 0000731802 us-gaap:OperatingSegmentsMember us-gaap:NaturalGasUsRegulatedMember ato:NaturalGasMarketingSegmentMember 2016-10-01 2017-09-30 0000731802 ato:DistributionSegmentMember us-gaap:ReportableSubsegmentsMember 2016-10-01 2017-09-30 0000731802 ato:DistributionSegmentMember us-gaap:IntersubsegmentEliminationsMember 2016-10-01 2017-09-30 0000731802 us-gaap:IntersegmentEliminationMember us-gaap:ReportableSubsegmentsMember 2016-10-01 2017-09-30 0000731802 us-gaap:IntersubsegmentEliminationsMember 2016-10-01 2017-09-30 0000731802 ato:PipelineandStorageSegmentMember us-gaap:IntersubsegmentEliminationsMember 2018-10-01 2019-09-30 0000731802 ato:DistributionSegmentMember us-gaap:ReportableSubsegmentsMember 2018-10-01 2019-09-30 0000731802 ato:PipelineandStorageSegmentMember us-gaap:ReportableSubsegmentsMember 2018-10-01 2019-09-30 0000731802 ato:DistributionSegmentMember us-gaap:IntersubsegmentEliminationsMember 2018-10-01 2019-09-30 0000731802 us-gaap:IntersubsegmentEliminationsMember 2018-10-01 2019-09-30 0000731802 us-gaap:IntersegmentEliminationMember us-gaap:IntersubsegmentEliminationsMember 2018-10-01 2019-09-30 0000731802 us-gaap:IntersegmentEliminationMember 2018-10-01 2019-09-30 0000731802 us-gaap:IntersegmentEliminationMember us-gaap:ReportableSubsegmentsMember 2018-10-01 2019-09-30 0000731802 us-gaap:ReportableSubsegmentsMember 2018-10-01 2019-09-30 0000731802 ato:GassalesrevenueMember ato:PipelineandStorageSegmentMember 2018-10-01 2019-09-30 0000731802 ato:MiscellaneousrevenueMember ato:PipelineandStorageSegmentMember 2018-10-01 2019-09-30 0000731802 ato:TransportationrevenueMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 ato:IndustrialCustomersMember ato:GassalesrevenueMember ato:PipelineandStorageSegmentMember 2018-10-01 2019-09-30 0000731802 ato:ResidentialCustomersMember ato:GassalesrevenueMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 ato:MiscellaneousrevenueMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 ato:ResidentialCustomersMember ato:GassalesrevenueMember ato:PipelineandStorageSegmentMember 2018-10-01 2019-09-30 0000731802 ato:IndustrialCustomersMember ato:GassalesrevenueMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 ato:PublicAuthorityandOtherCustomersMember ato:GassalesrevenueMember ato:PipelineandStorageSegmentMember 2018-10-01 2019-09-30 0000731802 ato:CommercialCustomersMember ato:GassalesrevenueMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 ato:CommercialCustomersMember ato:GassalesrevenueMember ato:PipelineandStorageSegmentMember 2018-10-01 2019-09-30 0000731802 ato:PublicAuthorityandOtherCustomersMember ato:GassalesrevenueMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 ato:TransportationrevenueMember ato:PipelineandStorageSegmentMember 2018-10-01 2019-09-30 0000731802 ato:GassalesrevenueMember ato:DistributionSegmentMember 2018-10-01 2019-09-30 0000731802 ato:UnsecuredSeniorNotesDue2043Member 2019-09-30 0000731802 ato:UnsecuredSeniorNotesDue2019Member 2018-09-30 0000731802 ato:UnsecuredDebenturesDue2028Member 2019-09-30 0000731802 ato:UnsecuredSeniorNotesDue2027Member 2018-09-30 0000731802 ato:UnsecuredSeniorNotesDue2049Member 2018-09-30 0000731802 ato:MultiDrawTermLoanMember 2018-09-30 0000731802 ato:UnsecuredSeniorNotesDue2041Member 2018-09-30 0000731802 ato:UnsecuredSeniorNotesDue2019Member 2019-09-30 0000731802 ato:UnsecuredSeniorNotesDue2044Member 2018-09-30 0000731802 ato:UnsecuredSeniorNotesDue2044Member 2019-09-30 0000731802 ato:MultiDrawTermLoanMember 2019-09-30 0000731802 ato:MediumTermNotesDue2025Member 2019-09-30 0000731802 ato:SeniorNotesDue2048Member 2018-09-30 0000731802 ato:UnsecuredSeniorNotesDue2034Member 2019-09-30 0000731802 ato:UnsecuredDebenturesDue2028Member 2018-09-30 0000731802 ato:UnsecuredSeniorNotesDue2027Member 2019-09-30 0000731802 ato:UnsecuredSeniorNotesDue2043Member 2018-09-30 0000731802 ato:UnsecuredSeniorNotesDue2049Member 2019-09-30 0000731802 ato:UnsecuredSeniorNotesDue2034Member 2018-09-30 0000731802 ato:SeniorNotesDue2048Member 2019-09-30 0000731802 ato:UnsecuredSeniorNotesDue2041Member 2019-09-30 0000731802 ato:MediumTermNotesDue2025Member 2018-09-30 0000731802 ato:SeniorNotesDue2048Member us-gaap:SeniorNotesMember 2018-10-04 2018-10-04 0000731802 ato:UnsecuredSeniorNotesDue2049Member us-gaap:SeniorNotesMember 2019-03-04 0000731802 us-gaap:CommercialPaperMember ato:FiveYearUnsecuredRevolvingCreditAgreementMember 2019-09-30 0000731802 srt:MinimumMember 2018-10-01 2019-09-30 0000731802 srt:MaximumMember us-gaap:CommercialPaperMember ato:FiveYearUnsecuredRevolvingCreditAgreementMember us-gaap:LondonInterbankOfferedRateLIBORMember 2018-10-01 2019-09-30 0000731802 srt:MaximumMember 2019-09-30 0000731802 us-gaap:RevolvingCreditFacilityMember ato:A10MillionRevolvingCreditNoteMember 2019-09-30 0000731802 srt:MinimumMember 2019-09-30 0000731802 ato:FiveYearUnsecuredRevolvingCreditAgreementMember 2019-09-30 0000731802 ato:MultiDrawTermLoanMember 2019-09-20 2019-09-20 0000731802 ato:SeniorNotesDue2048Member us-gaap:SeniorNotesMember 2018-10-04 0000731802 us-gaap:LineOfCreditMember ato:A25MillionBankLoanAgreementMember 2019-09-30 0000731802 ato:FiveYearUnsecuredRevolvingCreditAgreementMember 2018-09-30 0000731802 ato:Unsecured2.625SeniorNotesdue2029Member us-gaap:SeniorNotesMember us-gaap:SubsequentEventMember 2019-10-02 0000731802 ato:Unsecured8.50SeniorNotedue2019Member us-gaap:SeniorNotesMember 2018-09-30 0000731802 ato:Unsecured8.50SeniorNotedue2019Member us-gaap:SeniorNotesMember 2019-09-30 0000731802 us-gaap:SeniorNotesMember us-gaap:SubsequentEventMember 2019-10-02 2019-10-02 0000731802 srt:MaximumMember 2018-10-01 2019-09-30 0000731802 ato:Unsecured3.375SeniorNotesdue2049Member us-gaap:SeniorNotesMember us-gaap:SubsequentEventMember 2019-10-02 0000731802 srt:MinimumMember us-gaap:CommercialPaperMember ato:FiveYearUnsecuredRevolvingCreditAgreementMember us-gaap:LondonInterbankOfferedRateLIBORMember 2018-10-01 2019-09-30 0000731802 ato:UnsecuredSeniorNotesDue2049Member us-gaap:SeniorNotesMember 2019-03-04 2019-03-04 0000731802 us-gaap:CommercialPaperMember ato:FiveYearUnsecuredRevolvingCreditAgreementMember 2018-03-26 2018-03-26 0000731802 us-gaap:CommercialPaperMember ato:FiveYearUnsecuredRevolvingCreditAgreementMember 2018-10-01 2019-09-30 0000731802 us-gaap:InterestRateContractMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2018-10-01 2019-09-30 0000731802 us-gaap:InterestRateContractMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2019-09-30 0000731802 us-gaap:InterestRateContractMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2018-10-01 0000731802 us-gaap:InterestRateContractMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2018-09-30 0000731802 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-10-01 2019-09-30 0000731802 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2019-09-30 0000731802 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-09-30 0000731802 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-10-01 0000731802 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2018-10-01 0000731802 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2017-10-01 2018-09-30 0000731802 us-gaap:AccumulatedNetUnrealizedInvestmentGainLossMember 2017-09-30 0000731802 us-gaap:InterestRateContractMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2017-10-01 2018-09-30 0000731802 us-gaap:InterestRateContractMember us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember 2017-09-30 0000731802 ato:AtTheMarketMember 2018-11-19 0000731802 ato:CommonStockBlockTradeMember 2017-11-30 2017-11-30 0000731802 ato:AtTheMarketMember 2018-10-01 2019-09-30 0000731802 ato:CommonStockBlockTradeMember 2018-11-30 2018-11-30 0000731802 ato:ForwardSalesEquityAgreementsMember 2018-10-01 2019-09-30 0000731802 ato:ForwardSalesEquityAgreementsMember 2019-09-30 0000731802 ato:CommonStockBlockTradeMember 2019-09-30 0000731802 ato:ShelfRegistrationStatementMember 2019-09-30 0000731802 ato:CommonStockBlockTradeMember 2018-10-01 2019-09-30 0000731802 ato:AtTheMarketMember 2019-09-30 0000731802 ato:ShelfRegistrationStatementMember 2018-11-13 0000731802 ato:ForwardSalesEquityMaturitySeptember2020Member 2019-07-01 2019-09-30 0000731802 ato:ForwardSalesEquityMaturityMarch2020Member 2019-07-01 2019-09-30 0000731802 2018-10-01 2018-12-31 0000731802 ato:ForwardSalesEquityMaturityMarch2020Member 2017-10-01 2018-09-30 0000731802 2019-04-01 2019-06-30 0000731802 ato:ForwardSalesEquityMaturityMarch2020Member 2019-04-01 2019-06-30 0000731802 2019-01-01 2019-03-31 0000731802 ato:ForwardSalesEquityMaturitySeptember2020Member 2019-09-30 0000731802 ato:ForwardSalesEquityMaturityMarch2020Member 2018-10-01 2018-12-31 0000731802 ato:ForwardSalesEquityMaturitySeptember2020Member 2019-04-01 2019-06-30 0000731802 ato:ForwardSalesEquityMaturityMarch2020Member 2018-10-01 2019-09-30 0000731802 2019-07-01 2019-09-30 0000731802 ato:ForwardSalesEquityMaturitySeptember2020Member 2019-01-01 2019-03-31 0000731802 ato:ForwardSalesEquityMaturitySeptember2020Member 2018-10-01 2018-12-31 0000731802 ato:ForwardSalesEquityMaturityMarch2020Member 2019-09-30 0000731802 ato:ForwardSalesEquityMaturityMarch2020Member 2019-01-01 2019-03-31 0000731802 ato:ForwardSalesEquityMaturitySeptember2020Member 2018-09-30 0000731802 ato:ForwardSalesEquityMaturitySeptember2020Member 2018-10-01 2019-09-30 0000731802 ato:ForwardSalesEquityMaturitySeptember2020Member 2017-10-01 2018-09-30 0000731802 ato:ForwardSalesEquityMaturityMarch2020Member 2018-09-30 0000731802 ato:UnrecognizedActuarialGainLossMember 2019-09-30 0000731802 ato:UnrecognizedPriorServiceCreditMember 2018-09-30 0000731802 ato:UnrecognizedActuarialGainLossMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 ato:TotalUnrecognizedinNetPeriodicPensionCostMember us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2019-09-30 0000731802 ato:UnrecognizedPriorServiceCreditMember 2019-09-30 0000731802 ato:TotalUnrecognizedinNetPeriodicPensionCostMember us-gaap:PensionAndOtherPostretirementPlansCostsMember 2018-09-30 0000731802 ato:UnrecognizedPriorServiceCreditMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 ato:UnrecognizedPriorServiceCreditMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 ato:UnrecognizedActuarialGainLossMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 ato:UnrecognizedActuarialGainLossMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 ato:TotalUnrecognizedinNetPeriodicPensionCostMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 ato:UnrecognizedActuarialGainLossMember us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2019-09-30 0000731802 ato:TotalUnrecognizedinNetPeriodicPensionCostMember us-gaap:PensionAndOtherPostretirementPlansCostsMember 2019-09-30 0000731802 ato:UnrecognizedPriorServiceCreditMember us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2018-09-30 0000731802 ato:TotalUnrecognizedinNetPeriodicPensionCostMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 ato:TotalUnrecognizedinNetPeriodicPensionCostMember us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2018-09-30 0000731802 ato:UnrecognizedActuarialGainLossMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 ato:UnrecognizedActuarialGainLossMember us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2018-09-30 0000731802 ato:UnrecognizedPriorServiceCreditMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 ato:UnrecognizedPriorServiceCreditMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 ato:TotalUnrecognizedinNetPeriodicPensionCostMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 ato:UnrecognizedPriorServiceCreditMember us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2019-09-30 0000731802 ato:TotalUnrecognizedinNetPeriodicPensionCostMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 ato:UnrecognizedActuarialGainLossMember 2018-09-30 0000731802 ato:LimitedPartnershipInterestMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MutualFundMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:CorporateDebtSecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember us-gaap:FairValueInputsLevel2Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:EquitySecuritiesMember us-gaap:FairValueInputsLevel1Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 ato:CommonCollectiveTrustsMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel2Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:EquitySecuritiesMember us-gaap:FairValueInputsLevel2Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:FairValueInputsLevel2Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:USTreasurySecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MutualFundMember us-gaap:FairValueInputsLevel3Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel1Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:EquitySecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:USTreasurySecuritiesMember us-gaap:FairValueInputsLevel1Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:FairValueInputsLevel1Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MutualFundMember us-gaap:FairValueInputsLevel1Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:USTreasurySecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:USTreasurySecuritiesMember us-gaap:FairValueInputsLevel2Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:EquitySecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel1Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel3Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 ato:InvestmentsmeasuredatFVMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember us-gaap:FairValueInputsLevel1Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 ato:InvestmentsnetofreceivableMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:FairValueInputsLevel3Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MutualFundMember us-gaap:FairValueInputsLevel2Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel2Member us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2017-10-01 2018-09-30 0000731802 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-10-01 2019-09-30 0000731802 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2017-09-30 0000731802 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2016-10-01 2017-09-30 0000731802 us-gaap:FairValueInputsLevel3Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:FairValueInputsLevel1Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel2Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MutualFundMember us-gaap:FairValueInputsLevel1Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:FairValueInputsLevel3Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MutualFundMember us-gaap:FairValueInputsLevel2Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MutualFundMember us-gaap:FairValueInputsLevel3Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MutualFundMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:FairValueInputsLevel2Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel1Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:PensionPlansDefinedBenefitMember 2018-10-01 2019-09-30 0000731802 us-gaap:PensionPlansDefinedBenefitMember 2017-10-01 2018-09-30 0000731802 us-gaap:PensionPlansDefinedBenefitMember 2017-09-30 0000731802 us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2017-10-01 2018-09-30 0000731802 us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2018-10-01 2019-09-30 0000731802 us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2018-09-30 0000731802 us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2019-09-30 0000731802 us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2017-09-30 0000731802 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:EquitySecuritiesMember us-gaap:FairValueInputsLevel2Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:CorporateDebtSecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember us-gaap:FairValueInputsLevel2Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:USTreasurySecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:USTreasurySecuritiesMember us-gaap:FairValueInputsLevel2Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember us-gaap:FairValueInputsLevel1Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:EquitySecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel2Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:USTreasurySecuritiesMember us-gaap:FairValueInputsLevel1Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel2Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:FairValueInputsLevel3Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 ato:InvestmentsnetofreceivableMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:FairValueInputsLevel1Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 ato:CommonCollectiveTrustsMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:CorporateDebtSecuritiesMember us-gaap:FairValueInputsLevel1Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 ato:InvestmentsmeasuredatFVMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:EquitySecuritiesMember us-gaap:FairValueInputsLevel1Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 ato:LimitedPartnershipInterestMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel1Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:EquitySecuritiesMember us-gaap:FairValueInputsLevel3Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MutualFundMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:USTreasurySecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MutualFundMember us-gaap:FairValueInputsLevel2Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:FairValueInputsLevel2Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MutualFundMember us-gaap:FairValueInputsLevel3Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MutualFundMember us-gaap:FairValueInputsLevel1Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel3Member us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 ato:DomesticEquitySecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 ato:OtherInvestmentAssetsMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 ato:InternationalEquitySecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:FixedIncomeSecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 ato:CompanyStockMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 ato:DomesticEquitySecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 ato:CompanyStockMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:FixedIncomeSecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 ato:OtherInvestmentAssetsMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 ato:InternationalEquitySecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:PensionPlansDefinedBenefitMember 2016-10-01 2017-09-30 0000731802 ato:RetirementSavingsPlanMember 2018-10-01 2019-09-30 0000731802 ato:RetirementSavingsPlanMember 2019-09-30 0000731802 srt:MinimumMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 ato:RetirementSavingsPlanMember 2018-09-30 0000731802 ato:A2009SupplementalExecutiveRetirementPlanDefinedBenefitMember us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2018-10-01 2019-09-30 0000731802 srt:MaximumMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 ato:DiversifiedInvestmentFundsMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-10-01 2019-09-30 0000731802 ato:SupplementalExecutiveBenefitPlanMember us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2018-10-01 2019-09-30 0000731802 ato:RetirementSavingsPlanMember 2016-10-01 2017-09-30 0000731802 srt:MaximumMember us-gaap:PensionPlansDefinedBenefitMember 2018-10-01 2019-09-30 0000731802 ato:RetirementSavingsPlanMember 2017-10-01 2018-09-30 0000731802 ato:A1998SupplementalExecutiveRetirementPlanMember us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2018-10-01 2019-09-30 0000731802 us-gaap:CashAndCashEquivalentsMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 ato:DiversifiedInvestmentFundsMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 ato:DiversifiedInvestmentFundsMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-09-30 0000731802 us-gaap:CashAndCashEquivalentsMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember 2016-10-01 2017-09-30 0000731802 us-gaap:MutualFundMember us-gaap:FairValueInputsLevel3Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel1Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:FairValueInputsLevel3Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel3Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel2Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MutualFundMember us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MutualFundMember us-gaap:FairValueInputsLevel1Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:FairValueInputsLevel2Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MutualFundMember us-gaap:FairValueInputsLevel2Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:MoneyMarketFundsMember us-gaap:FairValueInputsLevel1Member us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-09-30 0000731802 srt:MinimumMember us-gaap:PensionPlansDefinedBenefitMember 2018-10-01 2019-09-30 0000731802 srt:MinimumMember ato:InternationalEquitySecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 srt:MaximumMember us-gaap:FixedIncomeSecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 srt:MinimumMember ato:OtherInvestmentAssetsMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 srt:MinimumMember ato:CompanyStockMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 srt:MaximumMember ato:InternationalEquitySecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 srt:MinimumMember ato:DomesticEquitySecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 srt:MaximumMember ato:DomesticEquitySecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 srt:MaximumMember ato:CompanyStockMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 srt:MinimumMember us-gaap:FixedIncomeSecuritiesMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 srt:MaximumMember ato:OtherInvestmentAssetsMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 ato:ContributionsinaidofconstructionreceivableMember 2019-09-30 0000731802 us-gaap:TradeAccountsReceivableMember us-gaap:BilledRevenuesMember 2018-09-30 0000731802 us-gaap:TradeAccountsReceivableMember us-gaap:UnbilledRevenuesMember 2018-09-30 0000731802 ato:OtherAccountsReceivableMember 2018-09-30 0000731802 ato:OtherAccountsReceivableMember 2019-09-30 0000731802 us-gaap:TradeAccountsReceivableMember us-gaap:BilledRevenuesMember 2019-09-30 0000731802 ato:ContributionsinaidofconstructionreceivableMember 2018-09-30 0000731802 us-gaap:TradeAccountsReceivableMember us-gaap:UnbilledRevenuesMember 2019-09-30 0000731802 us-gaap:OtherAssetsMember 2018-09-30 0000731802 us-gaap:OtherAssetsMember 2019-09-30 0000731802 us-gaap:OtherAssetsMember us-gaap:PensionPlansDefinedBenefitMember 2019-09-30 0000731802 us-gaap:OtherAssetsMember us-gaap:PensionPlansDefinedBenefitMember 2018-09-30 0000731802 ato:DistributionSegmentMember 2018-09-30 0000731802 ato:DistributionSegmentMember 2019-09-30 0000731802 ato:PipelineandStorageSegmentMember 2019-09-30 0000731802 ato:PipelineandStorageSegmentMember 2018-09-30 0000731802 us-gaap:VehiclesMember 2019-09-30 0000731802 us-gaap:ShortTermContractWithCustomerMember us-gaap:SupplyCommitmentMember 2018-10-01 2019-09-30 0000731802 srt:MaximumMember ato:LongtermContractwithCustomerWithinTwoToThreeYearsMember us-gaap:SupplyCommitmentMember 2018-10-01 2019-09-30 0000731802 ato:LongtermContractwithCustomerWithinTwoToThreeYearsMember us-gaap:SupplyCommitmentMember 2018-10-01 2019-09-30 0000731802 us-gaap:SupplyCommitmentMember 2018-10-01 2019-09-30 0000731802 srt:MinimumMember ato:LongtermContractwithCustomerWithinTwoToThreeYearsMember us-gaap:SupplyCommitmentMember 2018-10-01 2019-09-30 0000731802 us-gaap:ValuationAllowanceTaxCreditCarryforwardMember 2017-10-01 2018-09-30 0000731802 us-gaap:DomesticCountryMember 2019-09-30 0000731802 us-gaap:StateAndLocalJurisdictionMember 2019-09-30 0000731802 us-gaap:InterestRateContractMember 2018-10-01 2019-09-30 0000731802 us-gaap:OtherNoncurrentLiabilitiesMember us-gaap:CommodityContractMember us-gaap:NondesignatedMember 2019-09-30 0000731802 us-gaap:OtherCurrentAssetsMember us-gaap:CommodityContractMember us-gaap:NondesignatedMember 2019-09-30 0000731802 us-gaap:OtherCurrentLiabilitiesMember us-gaap:CommodityContractMember us-gaap:NondesignatedMember 2019-09-30 0000731802 us-gaap:OtherNoncurrentAssetsMember us-gaap:CommodityContractMember us-gaap:NondesignatedMember 2019-09-30 0000731802 us-gaap:NondesignatedMember 2019-09-30 0000731802 us-gaap:OtherCurrentAssetsMember us-gaap:CommodityContractMember us-gaap:NondesignatedMember 2018-09-30 0000731802 us-gaap:NondesignatedMember 2018-09-30 0000731802 us-gaap:DesignatedAsHedgingInstrumentMember 2018-09-30 0000731802 us-gaap:OtherCurrentAssetsMember us-gaap:InterestRateContractMember us-gaap:DesignatedAsHedgingInstrumentMember 2018-09-30 0000731802 us-gaap:OtherNoncurrentLiabilitiesMember us-gaap:CommodityContractMember us-gaap:NondesignatedMember 2018-09-30 0000731802 us-gaap:OtherCurrentLiabilitiesMember us-gaap:InterestRateContractMember us-gaap:DesignatedAsHedgingInstrumentMember 2018-09-30 0000731802 us-gaap:OtherCurrentLiabilitiesMember us-gaap:CommodityContractMember us-gaap:NondesignatedMember 2018-09-30 0000731802 us-gaap:OtherNoncurrentAssetsMember us-gaap:CommodityContractMember us-gaap:NondesignatedMember 2018-09-30 0000731802 ato:InterestRateHedgesSeniorNotes2019IssuanceMember 2015-09-30 0000731802 ato:GasPurchasesMember us-gaap:CommodityContractMember us-gaap:NondesignatedMember 2018-10-01 2019-09-30 0000731802 ato:GasPurchasesMember us-gaap:CommodityContractMember us-gaap:NondesignatedMember us-gaap:LongMember 2018-10-01 2019-09-30 0000731802 ato:GasPurchasesMember srt:MinimumMember us-gaap:CommodityContractMember us-gaap:NondesignatedMember 2019-09-30 0000731802 us-gaap:InterestRateSwapMember us-gaap:CashFlowHedgingMember us-gaap:DesignatedAsHedgingInstrumentMember 2018-10-01 2019-09-30 0000731802 ato:GasPurchasesMember srt:MaximumMember us-gaap:CommodityContractMember us-gaap:NondesignatedMember 2019-09-30 0000731802 ato:GasPurchasesMember us-gaap:CommodityContractMember us-gaap:NondesignatedMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel2Member us-gaap:FixedIncomeFundsMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel2Member us-gaap:EquitySecuritiesMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel3Member 2019-09-30 0000731802 us-gaap:FairValueInputsLevel1Member us-gaap:FixedIncomeFundsMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel3Member us-gaap:EquitySecuritiesMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel2Member 2019-09-30 0000731802 us-gaap:FairValueInputsLevel1Member 2019-09-30 0000731802 us-gaap:FairValueInputsLevel3Member us-gaap:DebtSecuritiesMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel1Member us-gaap:DebtSecuritiesMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel1Member us-gaap:EquitySecuritiesMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel2Member us-gaap:MoneyMarketFundsMember 2019-09-30 0000731802 us-gaap:EquitySecuritiesMember 2019-09-30 0000731802 us-gaap:FixedIncomeFundsMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel3Member us-gaap:MoneyMarketFundsMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel3Member us-gaap:FixedIncomeFundsMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel1Member us-gaap:MoneyMarketFundsMember 2019-09-30 0000731802 us-gaap:DebtSecuritiesMember 2019-09-30 0000731802 us-gaap:FairValueInputsLevel2Member us-gaap:DebtSecuritiesMember 2019-09-30 0000731802 us-gaap:MoneyMarketFundsMember 2019-09-30 0000731802 us-gaap:DebtSecuritiesMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel2Member 2018-09-30 0000731802 us-gaap:FairValueInputsLevel1Member 2018-09-30 0000731802 us-gaap:FairValueInputsLevel3Member 2018-09-30 0000731802 us-gaap:FairValueInputsLevel3Member us-gaap:MoneyMarketFundsMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel2Member us-gaap:MoneyMarketFundsMember 2018-09-30 0000731802 us-gaap:MoneyMarketFundsMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel1Member us-gaap:MoneyMarketFundsMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel3Member us-gaap:DebtSecuritiesMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel2Member us-gaap:FixedIncomeFundsMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel1Member us-gaap:DebtSecuritiesMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel1Member us-gaap:FixedIncomeFundsMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel1Member us-gaap:EquitySecuritiesMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel3Member us-gaap:FixedIncomeFundsMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel3Member us-gaap:EquitySecuritiesMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel2Member us-gaap:DebtSecuritiesMember 2018-09-30 0000731802 us-gaap:FairValueInputsLevel2Member us-gaap:EquitySecuritiesMember 2018-09-30 0000731802 us-gaap:FixedIncomeFundsMember 2018-09-30 0000731802 us-gaap:EquitySecuritiesMember 2018-09-30 0000731802 us-gaap:DiscontinuedOperationsDisposedOfBySaleMember ato:NaturalGasMarketingSegmentMember 2016-10-01 2017-09-30 0000731802 us-gaap:DiscontinuedOperationsDisposedOfBySaleMember 2016-10-01 2017-09-30 0000731802 us-gaap:DiscontinuedOperationsDisposedOfBySaleMember ato:NaturalGasMarketingSegmentMember 2017-01-01 0000731802 srt:MaximumMember us-gaap:DiscontinuedOperationsDisposedOfBySaleMember ato:NaturalGasMarketingSegmentMember 2016-10-01 2017-09-30 0000731802 us-gaap:RevolvingCreditFacilityMember us-gaap:DiscontinuedOperationsDisposedOfBySaleMember ato:NaturalGasMarketingSegmentMember ato:A25MillionUncommittedFacilityMember 2017-01-03 2017-01-03 0000731802 ato:UnsecuredRevolvingCreditNoteMember us-gaap:DiscontinuedOperationsDisposedOfBySaleMember ato:NaturalGasMarketingSegmentMember ato:A15MillionRevolvingCreditNoteMember 2017-01-03 2017-01-03 0000731802 srt:MinimumMember us-gaap:DiscontinuedOperationsDisposedOfBySaleMember ato:NaturalGasMarketingSegmentMember 2016-10-01 2017-09-30 0000731802 us-gaap:DiscontinuedOperationsDisposedOfBySaleMember ato:NaturalGasMarketingSegmentMember 2017-01-01 2017-01-01 0000731802 us-gaap:DiscontinuedOperationsDisposedOfBySaleMember ato:NaturalGasMarketingSegmentMember 2016-10-01 2017-09-30 0000731802 us-gaap:DiscontinuedOperationsDisposedOfBySaleMember ato:NaturalGasMarketingSegmentMember 2018-01-01 2018-03-31 0000731802 us-gaap:DiscontinuedOperationsDisposedOfBySaleMember ato:NaturalGasMarketingSegmentMember 2018-01-01 2018-01-31 0000731802 2018-04-01 2018-06-30 0000731802 2018-07-01 2018-09-30 0000731802 us-gaap:NaturalGasUsRegulatedMember 2018-01-01 2018-03-31 0000731802 us-gaap:NaturalGasUsRegulatedMember 2017-10-01 2017-12-31 0000731802 2017-10-01 2017-12-31 0000731802 ato:DistributionSegmentMember 2018-07-01 2018-09-30 0000731802 us-gaap:IntersegmentEliminationMember 2017-10-01 2017-12-31 0000731802 2018-01-01 2018-03-31 0000731802 ato:DistributionSegmentMember 2018-04-01 2018-06-30 0000731802 ato:PipelineandStorageSegmentMember 2018-07-01 2018-09-30 0000731802 ato:PipelineandStorageSegmentMember 2018-04-01 2018-06-30 0000731802 ato:DistributionSegmentMember 2018-01-01 2018-03-31 0000731802 ato:PipelineandStorageSegmentMember 2017-10-01 2017-12-31 0000731802 ato:DistributionSegmentMember 2017-10-01 2017-12-31 0000731802 us-gaap:IntersegmentEliminationMember 2018-01-01 2018-03-31 0000731802 us-gaap:IntersegmentEliminationMember 2018-07-01 2018-09-30 0000731802 us-gaap:NaturalGasUsRegulatedMember 2018-07-01 2018-09-30 0000731802 us-gaap:IntersegmentEliminationMember 2018-04-01 2018-06-30 0000731802 ato:PipelineandStorageSegmentMember 2018-01-01 2018-03-31 0000731802 us-gaap:NaturalGasUsRegulatedMember 2018-04-01 2018-06-30 0000731802 ato:PipelineandStorageSegmentMember 2019-07-01 2019-09-30 0000731802 us-gaap:NaturalGasUsRegulatedMember 2019-04-01 2019-06-30 0000731802 us-gaap:NaturalGasUsRegulatedMember 2019-07-01 2019-09-30 0000731802 ato:DistributionSegmentMember 2019-04-01 2019-06-30 0000731802 us-gaap:IntersegmentEliminationMember 2019-07-01 2019-09-30 0000731802 ato:PipelineandStorageSegmentMember 2019-04-01 2019-06-30 0000731802 ato:DistributionSegmentMember 2019-01-01 2019-03-31 0000731802 us-gaap:IntersegmentEliminationMember 2019-01-01 2019-03-31 0000731802 us-gaap:IntersegmentEliminationMember 2018-10-01 2018-12-31 0000731802 ato:DistributionSegmentMember 2019-07-01 2019-09-30 0000731802 ato:PipelineandStorageSegmentMember 2018-10-01 2018-12-31 0000731802 us-gaap:NaturalGasUsRegulatedMember 2018-10-01 2018-12-31 0000731802 us-gaap:NaturalGasUsRegulatedMember 2019-01-01 2019-03-31 0000731802 ato:DistributionSegmentMember 2018-10-01 2018-12-31 0000731802 us-gaap:IntersegmentEliminationMember 2019-04-01 2019-06-30 0000731802 ato:PipelineandStorageSegmentMember 2019-01-01 2019-03-31 0000731802 us-gaap:AllowanceForCreditLossMember 2018-10-01 2019-09-30 0000731802 us-gaap:AllowanceForCreditLossMember 2016-10-01 2017-09-30 0000731802 us-gaap:AllowanceForCreditLossMember 2017-10-01 2018-09-30 0000731802 us-gaap:AllowanceForCreditLossMember 2018-09-30 0000731802 us-gaap:AllowanceForCreditLossMember 2017-09-30 0000731802 us-gaap:AllowanceForCreditLossMember 2016-09-30 0000731802 us-gaap:AllowanceForCreditLossMember 2019-09-30 ato:segment ato:customer iso4217:USD xbrli:shares xbrli:pure ato:state xbrli:shares iso4217:USD ato:regulated_distribution_division utreg:Bcf utreg:MMcf iso4217:USD utreg:Mcf
Table of Contents

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 10-K
(Mark One)
ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended September 30, 2019
OR
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from                      to                     
Commission file number 1-10042
Atmos Energy Corporation
(Exact name of registrant as specified in its charter)
Texas and Virginia    75-1743247
(State or other jurisdiction of    (IRS employer
incorporation or organization)    identification no.)
1800 Three Lincoln Centre
5430 LBJ Freeway
Dallas, Texas    75240
(Address of principal executive offices)    (Zip code)
Registrant’s telephone number, including area code:
(972934-9227
Securities registered pursuant to Section 12(b) of the Act:
Table of each class
Trading Symbol
Name of each exchange on which registered
Common stock
No Par Value
ATO
New York Stock Exchange
Securities registered pursuant to Section 12(g) of the Act:
None
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  þ        No  ¨
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨        No  þ
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  þ        No  ¨
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  þ        No  ¨
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one):
Large accelerated filer
Accelerated filer
Non-accelerated filer
Smaller reporting company
Emerging growth company
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes         No  þ
The aggregate market value of the common voting stock held by non-affiliates of the registrant as of the last business day of the registrant’s most recently completed second fiscal quarter, March 31, 2019, was $11,826,627,172.
As of November 7, 2019, the registrant had 119,343,545 shares of common stock outstanding.
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the registrant’s Definitive Proxy Statement to be filed for the Annual Meeting of Shareholders on February 5, 2020 are incorporated by reference into Part III of this report.


Table of Contents

TABLE OF CONTENTS
 
 
 
 
 
 
Page
 
 
 
 
Part I
 
Item 1.
Item 1A.
Item 1B.
Item 2.
Item 3.
Item 4.
Mine Safety Disclosures
 
 
 
 
Part II
 
Item 5.
Item 6.
Item 7.
Item 7A.
Item 8.
Item 9.
Item 9A.
Item 9B.
 
 
 
 
Part III
 
Item 10.
Item 11.
Item 12.
Item 13.
Item 14.
 
 
 
 
Part IV
 
Item 15.
Item 16.


Table of Contents

GLOSSARY OF KEY TERMS
Adjusted diluted net income per share
Non-GAAP measure defined as diluted net income per share before the one-time, non-cash income tax benefit
Adjusted net income
Non-GAAP measure defined as net income before the one-time, non-cash income tax benefit
AEC
Atmos Energy Corporation
AEH
Atmos Energy Holdings, Inc.
AEM
Atmos Energy Marketing, LLC
AFUDC
Allowance for funds used during construction
AOCI
Accumulated Other Comprehensive Income
ARM
Annual Rate Mechanism
ATO
Trading symbol for Atmos Energy Corporation common stock on the NYSE
Bcf
Billion cubic feet
Contribution Margin
Non-GAAP measure defined as operating revenues less purchased gas cost
COSO
Committee of Sponsoring Organizations of the Treadway Commission
DARR
Dallas Annual Rate Review
ERISA
Employee Retirement Income Security Act of 1974
FASB
Financial Accounting Standards Board
FERC
Federal Energy Regulatory Commission
GAAP
Generally Accepted Accounting Principles
GRIP
Gas Reliability Infrastructure Program
GSRS
Gas System Reliability Surcharge
LTIP
1998 Long-Term Incentive Plan
Mcf
Thousand cubic feet
MDWQ
Maximum daily withdrawal quantity
Mid-Tex ATM Cities
Represents a coalition of 47 incorporated cities or approximately 8 percent of the Mid-Tex Division's customers.
Mid-Tex Cities
Represents all incorporated cities other than Dallas and Mid-Tex ATM Cities, or approximately 72 percent of the Mid-Tex Division’s customers.
MMcf
Million cubic feet
Moody’s
Moody’s Investor Service, Inc.
NGA
Natural Gas Act of 1938
NYMEX
New York Mercantile Exchange, Inc.
NYSE
New York Stock Exchange
PHMSA
Pipeline and Hazardous Materials Safety Administration
PPA
Pension Protection Act of 2006
PRP
Pipeline Replacement Program
RRC
Railroad Commission of Texas
RRM
Rate Review Mechanism
RSC
Rate Stabilization Clause
S&P
Standard & Poor’s Corporation
SAVE
Steps to Advance Virginia Energy
SEC
United States Securities and Exchange Commission
SGR
Supplemental Growth Rider
SIR
System Integrity Rider
SRF
Stable Rate Filing
SSIR
System Safety and Integrity Rider
TCJA
Tax Cuts and Jobs Act of 2017
WNA
Weather Normalization Adjustment

3

Table of Contents

PART I
The terms “we,” “our,” “us”, “Atmos Energy” and the “Company” refer to Atmos Energy Corporation and its subsidiaries, unless the context suggests otherwise.
 
ITEM 1.
Business.
Overview and Strategy
Atmos Energy Corporation, headquartered in Dallas, Texas, and incorporated in Texas and Virginia, is one of the country’s largest natural-gas-only distributors based on number of customers. We deliver safe, clean, reliable, efficient, affordable and abundant natural gas through regulated sales and transportation arrangements to over three million residential, commercial, public authority and industrial customers in eight states located primarily in the South. We also operate one of the largest intrastate pipelines in Texas based on miles of pipe.
Atmos Energy's vision is to be the safest provider of natural gas services. We intend to achieve this vision by:
operating our business exceptionally well
investing in our people and infrastructure
enhancing our culture.
Since 2011, our operating strategy has focused on modernizing our distribution and transmission system to improve safety and reliability. Since that time, our capital expenditures have increased approximately 14% annually. Additionally, during this period, we have added new or modified existing regulatory mechanisms to reduce regulatory lag. Our ability to increase capital spending annually to modernize our system has increased our rate base, which has resulted in rising earnings per share and shareholder value.
Our core values include focusing on our employees and customers while conducting our business with honesty and integrity. We continue to strengthen our culture through ongoing communications with our employees and enhanced employee training.
Operating Segments
As of September 30, 2019, we manage and review our consolidated operations through the following reportable segments, which are discussed in further detail below.
The distribution segment is primarily comprised of our regulated natural gas distribution and related sales operations in eight states.
The pipeline and storage segment is comprised primarily of the pipeline and storage operations of our Atmos Pipeline-Texas division and our natural gas transmission operations in Louisiana.
Prior to disposition, the natural gas marketing segment, which was comprised of our natural gas marketing business, was also a reportable segment.

4

Table of Contents

Distribution Segment Overview
The following table summarizes key information about our six regulated natural gas distribution divisions, presented in order of total rate base.
Division
 
Service Areas
 
Communities Served
 
Customer Meters
Mid-Tex
 
Texas, including the Dallas/Fort Worth Metroplex
 
550
 
1,722,424
Kentucky/Mid-States
 
Kentucky
 
230
 
183,450
 
 
Tennessee
 
 
 
154,004
 
 
Virginia
 
 
 
24,536
Louisiana
 
Louisiana
 
270
 
365,320
West Texas
 
Amarillo, Lubbock, Midland
 
80
 
316,844
Mississippi
 
Mississippi
 
110
 
266,727
Colorado-Kansas
 
Colorado
 
170
 
121,883
 
 
Kansas
 
 
 
136,647
We operate in our service areas under terms of non-exclusive franchise agreements granted by the various cities and towns that we serve. At September 30, 2019, we held 1,017 franchises having terms generally ranging from five to 35 years. A significant number of our franchises expire each year, which require renewal prior to the end of their terms. Historically, we have successfully renewed these franchises and believe that we will continue to be able to renew our franchises as they expire.
Revenues in this operating segment are established by regulatory authorities in the states in which we operate. These rates are intended to be sufficient to cover the costs of conducting business, including a reasonable return on invested capital. In addition, we transport natural gas for others through our distribution systems.
Rates established by regulatory authorities often include cost adjustment mechanisms for costs that (i) are subject to significant price fluctuations compared to our other costs, (ii) represent a large component of our cost of service and (iii) are generally outside our control.
Purchased gas cost adjustment mechanisms represent a common form of cost adjustment mechanism. Purchased gas cost adjustment mechanisms provide a method of recovering purchased gas costs on an ongoing basis without filing a rate case because they provide a dollar-for-dollar offset to increases or decreases in the cost of natural gas. Therefore, although substantially all of our distribution operating revenues fluctuate with the cost of gas that we purchase, distribution Contribution Margin is generally not affected by fluctuations in the cost of gas.
Additionally, some jurisdictions have performance-based ratemaking adjustments to provide incentives to minimize purchased gas costs through improved storage management and use of financial instruments to reduce volatility in gas costs. Under the performance-based ratemaking adjustments, purchased gas costs savings are shared between the Company and its customers.
Our supply of natural gas is provided by a variety of suppliers, including independent producers, marketers and pipeline companies, withdrawals of gas from proprietary and contracted storage assets and peaking and spot purchase agreements, as needed.
Supply arrangements consist of both base load and swing supply (peaking) quantities and are contracted from our suppliers on a firm basis with various terms at market prices. Base load quantities are those that flow at a constant level throughout the month and swing supply quantities provide the flexibility to change daily quantities to match increases or decreases in requirements related to weather conditions.
Except for local production purchases, we select our natural gas suppliers through a competitive bidding process by periodically requesting proposals from suppliers that have demonstrated that they can provide reliable service. We select these suppliers based on their ability to deliver gas supply to our designated firm pipeline receipt points at the lowest reasonable cost. Major suppliers during fiscal 2019 were Castleton Commodities Merchant Trading L.P., CenterPoint Energy Services, Inc., Concord Energy LLC, ConocoPhillips Company, Devon Gas Services, L.P., Hartree Partners, L.P., Targa Gas Marketing LLC, Tenaska Marketing Ventures & Gas Storage, LLC, Texla Energy Management, Inc. and United Energy Trading, LLC.
The combination of base load, peaking and spot purchase agreements, coupled with the withdrawal of gas held in storage, allows us the flexibility to adjust to changes in weather, which minimizes our need to enter into long-term firm commitments.

5

Table of Contents

We estimate our peak-day availability of natural gas supply to be approximately 4.4 Bcf. The peak-day demand for our distribution operations in fiscal 2019 was on March 4, 2019, when sales to customers reached approximately 3.3 Bcf.
Currently, our distribution divisions utilize 37 pipeline transportation companies, both interstate and intrastate, to transport our natural gas. The pipeline transportation agreements are firm and many of them have “pipeline no-notice” storage service, which provides for daily balancing between system requirements and nominated flowing supplies. These agreements have been negotiated with the shortest term necessary while still maintaining our right of first refusal. The natural gas supply for our Mid-Tex Division is delivered primarily by our APT Division.
To maintain our deliveries to high priority customers, we have the ability, and have exercised our right, to curtail deliveries to certain customers under the terms of interruptible contracts or applicable state regulations or statutes. Our customers’ demand on our system is not necessarily indicative of our ability to meet current or anticipated market demands or immediate delivery requirements because of factors such as the physical limitations of gathering, storage and transmission systems, the duration and severity of cold weather, the availability of gas reserves from our suppliers, the ability to purchase additional supplies on a short-term basis and actions by federal and state regulatory authorities. Curtailment rights provide us the flexibility to meet the human-needs requirements of our customers on a firm basis. Priority allocations imposed by federal and state regulatory agencies, as well as other factors beyond our control, may affect our ability to meet the demands of our customers. We do not anticipate any problems with obtaining additional gas supply as needed for our customers.
Pipeline and Storage Segment Overview
Our pipeline and storage segment consists of the pipeline and storage operations of APT and our natural gas transmission operations in Louisiana. APT is one of the largest intrastate pipeline operations in Texas with a heavy concentration in the established natural gas-producing areas of central, northern and eastern Texas, extending into or near the major producing areas of the Barnett Shale, the Texas Gulf Coast and the Permian Basin of West Texas. Through its system, APT provides transportation and storage services to our Mid-Tex Division, other third party local distribution companies, industrial and electric generation customers, marketers and producers. As part of its pipeline operations, APT owns and operates five underground storage reservoirs in Texas.
Revenues earned from transportation and storage services for APT are subject to traditional ratemaking governed by the RRC. Rates are updated through periodic filings made under Texas’ GRIP. GRIP allows us to include in our rate base annually approved capital costs incurred in the prior calendar year provided that we file a complete rate case at least once every five years; the most recent of which was completed in August 2017. APT’s existing regulatory mechanisms allow certain transportation and storage services to be provided under market-based rates.
Our natural gas transmission operations in Louisiana are comprised of a 21-mile pipeline located in the New Orleans, Louisiana area that is primarily used to aggregate gas supply for our distribution division in Louisiana under a long-term contract and, on a more limited basis, to third parties. The demand fee charged to our Louisiana distribution division for these services is subject to regulatory approval by the Louisiana Public Service Commission. We also manage two asset management plans in Louisiana that serve distribution affiliates of the Company, which have been approved by applicable state regulatory commissions. Generally, these asset management plans require us to share with our distribution customers a significant portion of the cost savings earned from these arrangements.
Natural Gas Marketing Segment Overview
Through December 31, 2016, we were engaged in a nonregulated natural gas marketing business, which was conducted by Atmos Energy Marketing (AEM). AEM’s primary business was to aggregate and purchase gas supply, arrange transportation and storage logistics and ultimately deliver gas to customers at competitive prices. Additionally, AEM utilized proprietary and customer-owned transportation and storage assets to provide various services to its customers as requested.
As more fully described in Note 16, effective January 1, 2017, we sold all of the equity interests of AEM to CenterPoint Energy Services, Inc. (CES), a subsidiary of CenterPoint Energy Inc. As a result of the sale, Atmos Energy fully exited the nonregulated natural gas marketing business. Accordingly, these operations have been reported as discontinued operations.
Ratemaking Activity
Overview
The method of determining regulated rates varies among the states in which our regulated businesses operate. The regulatory authorities have the responsibility of ensuring that utilities in their jurisdictions operate in the best interests of customers while providing utility companies the opportunity to earn a reasonable return on their investment. Generally, each regulatory authority reviews rate requests and establishes a rate structure intended to generate revenue sufficient to cover the costs of conducting business, including a reasonable return on invested capital.

6

Table of Contents

Our rate strategy focuses on reducing or eliminating regulatory lag, obtaining adequate returns and providing stable, predictable margins, which benefit both our customers and the Company. As a result of our ratemaking efforts in recent years, Atmos Energy has:
Formula rate mechanisms in place in four states that provide for an annual rate review and adjustment to rates.
Infrastructure programs in place in the majority of our states that provide for an annual adjustment to rates for qualifying capital expenditures. Through our annual formula rate mechanisms and infrastructure programs, we have the ability to recover approximately 90 percent of our capital expenditures within six months and substantially all of our capital expenditures within twelve months.
Authorization in tariffs, statute or commission rules that allows us to defer certain elements of our cost of service such as depreciation, ad valorem taxes and pension costs, until they are included in rates.
WNA mechanisms in seven states that serve to minimize the effects of weather on approximately 97 percent of our distribution Contribution Margin.
The ability to recover the gas cost portion of bad debts in five states.
The following table provides a jurisdictional rate summary for our regulated operations as of September 30, 2019. This information is for regulatory purposes only and may not be representative of our actual financial position.
Division
 
Jurisdiction
 
Effective
Date of Last
Rate/GRIP Action
 
Rate Base
(thousands)(1)
 
Authorized
Rate of
Return(1)
 
Authorized Debt/
Equity Ratio(1)
Authorized
Return
on Equity(1)
Atmos Pipeline — Texas
 
Texas
 
05/07/2019
 
$2,387,764
 
8.87%
 
47/53
11.50%
Colorado-Kansas
 
Colorado
 
05/03/2018
 
134,726
 
7.55%
 
44/56
9.45%
 
 
Colorado SSIR
 
01/01/2019
 
40,009
 
7.55%
 
44/56
9.45%
 
 
Kansas
 
03/17/2016
 
200,564
 
(3)
 
(3)
(3)
 
 
Kansas GSRS
 
05/01/2019
 
26,322
 
(3)
 
(3)
(3)
Kentucky/Mid-States
 
Kentucky
 
05/08/2019
 
424,929
 
7.49%
 
42/58
9.65%
 
 
Tennessee
 
06/01/2019
 
389,061
 
7.79%
 
42/58
9.80%
 
 
Virginia
 
04/01/2019
 
47,827
 
7.43%
 
42/58
9.20%
Louisiana
 
Trans La
 
04/01/2019
 
192,586
 
7.81%
 
41/59
9.80%
 
 
LGS
 
07/01/2019
 
468,958
 
7.79%
 
42/58
9.80%
Mid-Tex
 
Mid-Tex Cities(8)
 
10/01/2018
 
2,587,261(2)
 
7.87%
 
42/58
9.80%
 
 
Mid-Tex - ATM Cities
 
09/26/2019
 
2,975,975(2)
 
7.97%
 
40/60
9.80%
 
 
Mid-Tex - Environs
 
06/04/2019
 
2,975,978(2)
 
7.97%
 
40/60
9.80%
 
 
Dallas(11)
 
06/01/2019
 
2,861,599(2)
 
7.96%
 
40/60
9.80%
Mississippi
 
Mississippi(7)
 
11/01/2018
 
415,627
 
7.81%
 
45/55
10.24%
 
 
Mississippi - SIR(7)
 
11/01/2018
 
126,049
 
7.81%
 
45/55
10.24%
West Texas
 
West Texas Cities(4) (9)
 
10/01/2018
 
503,332(10)
 
7.87%
 
42/58
9.80%
 
 
West Texas - ALDC
 
05/01/2019
 
594,539(10)
 
8.57%
 
48/52
10.50%
 
 
West Texas - Environs
 
06/04/2019
 
592,919(10)
 
7.97%
 
40/60
9.80%
 

7

Table of Contents

Division
 
Jurisdiction
 
Bad  Debt
Rider(5)
 
Formula Rate
 
Infrastructure Mechanism
Performance Based
Rate Program(6)
 
WNA Period
Atmos Pipeline —  Texas
 
Texas
 
No
 
Yes
 
Yes
N/A
 
N/A
Colorado-Kansas
 
Colorado
 
No
 
No
 
Yes
No
 
N/A
 
 
Kansas
 
Yes
 
No
 
Yes
Yes
 
October-May
Kentucky/Mid-States
 
Kentucky
 
Yes
 
No
 
Yes
Yes
 
November-April
 
 
Tennessee
 
Yes
 
Yes
 
No
Yes
 
October-April
 
 
Virginia
 
Yes
 
No
 
Yes
No
 
January-December
Louisiana
 
Trans La
 
No
 
Yes
 
Yes
No
 
December-March
 
 
LGS
 
No
 
Yes
 
Yes
No
 
December-March
Mid-Tex Cities
 
Texas
 
Yes
 
Yes
 
Yes
No
 
November-April
Mid-Tex — Dallas
 
Texas
 
Yes
 
Yes
 
Yes
No
 
November-April
Mississippi
 
Mississippi
 
No
 
Yes
 
Yes
No
 
November-April
West Texas
 
Texas
 
Yes
 
Yes
 
Yes
No
 
October-May
 
(1)
The rate base, authorized rate of return, authorized debt/equity ratio and authorized return on equity presented in this table are those from the most recent regulatory filing for each jurisdiction. These rate bases, rates of return, debt/equity ratio and returns on equity are not necessarily indicative of current or future rate bases, rates of return or returns on equity.
(2)
The Mid-Tex rate base represents a “system-wide,” or 100 percent, of the Mid-Tex Division’s rate base.
(3)
A rate base, rate of return, return on equity or debt/equity ratio was not included in the respective state commission’s final decision.
(4)
The West Texas Cities includes all West Texas Division cities except Amarillo, Channing, Dalhart and Lubbock (ALDC).
(5)
The bad debt rider allows us to recover from ratepayers the gas cost portion of bad debts.
(6)
The performance-based rate program provides incentives to distribution companies to minimize purchased gas costs by allowing the companies and their customers to share the purchased gas costs savings.
(7)
The Mississippi Public Service Commission approved a settlement at its meeting on October 24, 2019, which included a rate base of $634.4 million and an authorized return of 7.81%. New rates were implemented November 1, 2019.
(8)
The Mid-Tex Cities approved the Formula Rate Mechanism filing with rates effective October 1, 2019, which included a rate base of $3,052.6 million, an authorized return of 7.83%, a debt/equity ratio of 42/58 and an authorized ROE of 9.80%.
(9)
The West Texas Cities approved the Formula Rate Mechanism filing with rates effective October 1, 2019, which included a rate base of $591.5 million, an authorized return of 7.83%, a debt/equity ratio of 42/58 and an authorized ROE of 9.80%.
(10)
The West Texas rate base represents a "system-wide," or 100 percent, of the West Texas Division's rate base.
(11)
The Company and the City of Dallas have arrived at a settlement. This settlement has not yet been approved by the Railroad Commission of Texas (RRC). The DARR rates were implemented subject to refund on June 1, 2019.
Although substantial progress has been made in recent years to improve rate design and recovery of investment across our service areas, we are continuing to seek improvements in rate design to address cost variations and pursue tariffs that reduce regulatory lag associated with investments. Further, potential changes in federal energy policy, federal safety regulations and changing economic conditions will necessitate continued vigilance by the Company and our regulators in meeting the challenges presented by these external factors.
Recent Ratemaking Activity
The amounts described in the following sections represent the operating income that was requested or received in each rate filing, which may not necessarily reflect the stated amount referenced in the final order, as certain operating costs may have changed as a result of the commission's or other governmental authority's final ruling. The following table summarizes our ratemaking outcomes for the last three fiscal years. The ratemaking outcomes for fiscal 2019 and 2018 include the effect of tax reform legislation enacted effective January 1, 2018 and do not reflect the true economic benefit of the outcomes because they do not include the corresponding income tax benefit we will receive due to the decrease in our statutory tax rate.
 
 
Annual Increase (Decrease) to Operating
Income For the Fiscal Year Ended September 30
Rate Action
 
2019
 
2018
 
2017
 
 
(In thousands)
Annual formula rate mechanisms
 
$
114,810

 
$
92,472

 
$
90,427

Rate case filings
 
1,656

 
(12,853
)
 
12,961

Other ratemaking activity
 
214

 
457

 
784

 
 
$
116,680

 
$
80,076

 
$
104,172




8

Table of Contents

Additionally, the following ratemaking efforts seeking $81.2 million in annual operating income were initiated during fiscal 2019 but had not been completed as of September 30, 2019:
Division
 
Rate Action
 
Jurisdiction
 
Operating Income
Requested
 
 
 
 
 
 
(In thousands)
Colorado-Kansas
 
Rate Case
 
Kansas
 
$
3,697

Kentucky/Mid-States
 
Infrastructure Mechanism
 
Kentucky (1)
 
2,912

Kentucky/Mid-States
 
Formula Rate Mechanism
 
Tennessee
 
726

Kentucky/Mid-States
 
Infrastructure Mechanism
 
Virginia (2)
 
85

Mid-Tex
 
Formula Rate Mechanism
 
Mid-Tex Cities (3)
 
47,733

Mississippi
 
Infrastructure Mechanism
 
Mississippi (4)
 
8,569

Mississippi
 
Formula Rate Mechanism
 
Mississippi (4)
 
11,448

West Texas
 
Formula Rate Mechanism
 
West Texas Cities (5)
 
6,226

West Texas
 
Rate Case
 
West Texas Triangle
 
(242
)
 
 
 
 
 
 
$
81,154


(1)
On September 24, 2019, the Kentucky Public Service Commission approved this filing with rates to be implemented beginning October 1, 2019.
(2)
On September 24, 2019, the State Corporation Commission of Virginia approved a rate increase of $0.1 million effective October 1, 2019.
(3)
The Mid-Tex Cities approved a rate increase of $34.4 million effective October 1, 2019.
(4) The Mississippi Public Service Commission approved an increase in operating income of $7.6 million for the SIR filing and $6.9 million for the SRF filing. New rates were implemented November 1, 2019.
(5)
The West Texas Cities approved a rate increase of $4.9 million effective October 1, 2019.

Our recent ratemaking activity is discussed in greater detail below.
Annual Formula Rate Mechanisms
As an instrument to reduce regulatory lag, formula rate mechanisms allow us to refresh our rates on an annual basis without filing a formal rate case. However, these filings still involve discovery by the appropriate regulatory authorities prior to the final determination of rates under these mechanisms. The following table summarizes our annual formula rate mechanisms by state.
 
 
Annual Formula Rate Mechanisms
State
 
Infrastructure Programs
 
Formula Rate Mechanisms
 
 
 
 
 
Colorado
 
System Safety and Integrity Rider (SSIR)
 
Kansas
 
Gas System Reliability Surcharge (GSRS)
 
Kentucky
 
Pipeline Replacement Program (PRP)
 
Louisiana
 
(1)
 
Rate Stabilization Clause (RSC)
Mississippi
 
System Integrity Rider (SIR)
 
Stable Rate Filing (SRF)
Tennessee
 
 
Annual Rate Mechanism (ARM)
Texas
 
Gas Reliability Infrastructure Program (GRIP), (1)
 
Dallas Annual Rate Review (DARR), Rate Review Mechanism (RRM)
Virginia
 
Steps to Advance Virginia Energy (SAVE)
 
(1)
Infrastructure mechanisms in Texas and Louisiana allow for the deferral of all expenses associated with capital expenditures incurred pursuant to these rules, which primarily consists of interest, depreciation and other taxes (Texas only), until the next rate proceeding (rate case or annual rate filing), at which time investment and costs would be recoverable through base rates.

9

Table of Contents

The following table summarizes our annual formula rate mechanisms with effective dates during the fiscal years ended September 30, 2019, 2018 and 2017:
Division
 
Jurisdiction
 
Test Year Ended
 
Increase
(Decrease) in
Annual
Operating
Income
 
Effective
Date
 
 
 
 
 
 
(In thousands)
 
 
2019 Filings:
 
 
 
 
 
 
 
 
Mid-Tex
 
ATM Cities
 
12/2018
 
$
6,591

 
09/26/2019
Louisiana
 
LGS
 
12/2018
 
7,124

 
07/01/2019
Mid-Tex
 
Environs
 
12/2018
 
2,435

 
06/04/2019
West Texas
 
Environs
 
12/2018
 
1,005

 
06/04/2019
Mid-Tex
 
DARR (1)
 
09/2018
 
9,452

 
06/01/2019
Kentucky/Mid-States
 
Tennessee ARM
 
05/2020
 
2,393

 
06/01/2019
Atmos Pipeline - Texas
 
Texas
 
12/2018
 
49,225

 
05/07/2019
West Texas
 
Amarillo, Lubbock, Dalhart and Channing
 
12/2018
 
5,692

 
05/01/2019
Colorado-Kansas
 
Kansas GSRS
 
12/2018
 
1,562

 
05/01/2019
Louisiana
 
Trans La
 
09/2018
 
4,719

 
04/01/2019
Colorado-Kansas
 
Colorado GIS
 
12/2019
 
87

 
04/01/2019
Colorado-Kansas
 
Colorado SSIR
 
12/2019
 
2,147

 
01/01/2019
Mississippi
 
Mississippi - SIR
 
10/2019
 
7,135

 
11/01/2018
Mississippi
 
Mississippi - SRF
 
10/2019
 
(118
)
 
11/01/2018
Kentucky/Mid-States
 
Tennessee ARM
 
05/2019
 
(5,032
)
 
10/15/2018
Mid-Tex
 
Mid-Tex RRM Cities
 
12/2017
 
17,633

 
10/01/2018
West Texas
 
West Texas Cities RRM
 
12/2017
 
2,760

 
10/01/2018
Total 2019 Filings
 
 
 
 
 
$
114,810

 
 
 
 
 
 
 
 
 
 
 
2018 Filings:
 
 
 
 
 
 
 
 
Louisiana
 
LGS
 
12/2017
 
$
(1,521
)
 
07/01/2018
West Texas
 
Amarillo, Lubbock, Dalhart and Channing
 
12/2017
 
4,418

 
06/08/2018
Mid-Tex
 
Environs
 
12/2017
 
1,604

 
06/05/2018
West Texas
 
Environs
 
12/2017
 
826

 
06/05/2018
Atmos Pipeline - Texas
 
Texas
 
12/2017
 
42,173

 
05/22/2018
Louisiana
 
Trans La
 
09/2017
 
(1,913
)
 
05/01/2018
Colorado-Kansas
 
Kansas GSRS
 
09/2018
 
820

 
02/27/2018
Mississippi
 
Mississippi - SIR
 
10/2018
 
7,658

 
01/01/2018
Mississippi
 
Mississippi - SGR (2)
 
10/2018
 
1,245

 
01/01/2018
Mississippi
 
Mississippi - SRF (2)
 
10/2018
 

 
01/01/2018
Colorado-Kansas
 
Colorado SSIR
 
12/2018
 
2,228

 
12/20/2017
Atmos Pipeline - Texas
 
Texas
 
12/2016
 
28,988

 
12/05/2017
Kentucky/Mid-States
 
Kentucky - PRP
 
09/2018
 
5,638

 
10/27/2017
Kentucky/Mid-States
 
Virginia - SAVE
 
09/2017
 
308

 
10/01/2017
Total 2018 Filings
 
 
 
 
 
$
92,472

 
 
 
 
 
 
 
 
 
 
 
2017 Filings:
 
 
 
 
 
 
 
 
Louisiana
 
LGS
 
12/2016
 
$
6,237

 
07/01/2017
Mid-Tex
 
Mid-Tex DARR
 
09/2016
 
9,672

 
06/01/2017

10

Table of Contents

Mid-Tex
 
Mid-Tex Cities RRM
 
12/2016
 
36,239

 
06/01/2017
Kentucky/Mid-States
 
Tennessee ARM
 
05/2018
 
6,740

 
06/01/2017
Mid-Tex
 
Environs
 
12/2016
 
1,568

 
05/23/2017
West Texas
 
Environs
 
12/2016
 
872

 
05/23/2017
West Texas
 
Amarillo, Lubbock, Dalhart and Channing
 
12/2016
 
4,682

 
04/25/2017
Louisiana
 
Trans La
 
09/2016
 
4,392

 
04/01/2017
West Texas
 
West Texas Cities RRM
 
09/2016
 
4,255

 
03/15/2017
Colorado-Kansas
 
Kansas
 
09/2016
 
801

 
02/09/2017
Mississippi
 
Mississippi - SRF
 
10/2017
 
4,390

 
02/01/2017
Mississippi
 
Mississippi - SIR
 
10/2017
 
3,334

 
01/01/2017
Mississippi
 
Mississippi - SGR
 
10/2017
 
1,292

 
01/01/2017
Colorado-Kansas
 
Colorado - SSIR
 
12/2017
 
1,350

 
01/01/2017
Kentucky/Mid-States
 
Kentucky - PRP
 
09/2017
 
4,981

 
10/14/2016
Kentucky/Mid-States
 
Virginia - SAVE
 
09/2017
 
(378
)
 
10/01/2016
Total 2017 Filings
 
 
 
 
 
$
90,427

 
 

(1)
The Company and the City of Dallas have arrived at a settlement. This settlement has not yet been approved by the RRC. The DARR rates were implemented subject to refund on June 1, 2019.
(2)
Beginning in fiscal 2019, our SGR rate base was combined with our SRF rate base, per Commission order.
Rate Case Filings
A rate case is a formal request from Atmos Energy to a regulatory authority to increase rates that are charged to customers. Rate cases may also be initiated when the regulatory authorities request us to justify our rates. This process is referred to as a “show cause” action. Adequate rates are intended to provide for recovery of the Company’s costs as well as a reasonable rate of return to our shareholders and ensure that we continue to safely deliver reliable, reasonably priced natural gas service to our customers. The following table summarizes our recent rate cases:
Division
 
State
 
Increase (Decrease) in Annual
Operating Income
 
Effective Date
 
 
 
 
(In thousands)
 
 
2019 Rate Case Filings:
 
 
 
 
 
 
Mid-Tex (ATM Cities)
 
Texas
 
$
2,113

 
06/01/2019
Kentucky/Mid-States
 
Kentucky
 
3,441

 
05/08/2019
Kentucky/Mid-States
 
Virginia
 
(400
)
 
04/01/2019
Mid-Tex (Environs)
 
Texas
 
(2,674
)
 
01/01/2019
West Texas (Environs)
 
Texas
 
(824
)
 
01/01/2019
Total 2019 Rate Case Filings
 
 
 
$
1,656

 
 
2018 Rate Case Filings:
 
 
 
 
 
 
Colorado-Kansas
 
Colorado
 
$
(241
)
 
05/03/2018
Kentucky/Mid-States
 
Kentucky
 
(7,504
)
 
05/03/2018
Mid-Tex - City of Dallas
 
Texas
 
(5,108
)
 
02/14/2018
Total 2018 Rate Case Filings
 
 
 
$
(12,853
)
 
 
2017 Rate Case Filings:
 
 
 
 
 
 
Atmos Pipeline - Texas
 
Texas
 
$
12,955

 
08/01/2017
Kentucky/Mid-States
 
Virginia
 
6

 
12/27/2016
Total 2017 Rate Case Filings
 
 
 
$
12,961

 
 


11

Table of Contents

Other Ratemaking Activity
The following table summarizes other ratemaking activity during the fiscal years ended September 30, 2019, 2018 and 2017:
Division
 
Jurisdiction
 
Rate Activity
 
Increase in Annual
Operating Income
 
Effective
Date
 
 
 
 
 
 
(In thousands)
 
 
2019 Other Rate Activity:
 
 
 
 
 
 
 
 
Colorado-Kansas
 
Kansas
 
Ad Valorem (1)
 
$
214

 
02/01/2019
Total 2019 Other Rate Activity
 
 
 
 
 
$
214

 
 
2018 Other Rate Activity:
 
 
 
 
 
 
 
 
Colorado-Kansas
 
Kansas
 
Ad Valorem(1)
 
$
457

 
02/01/2018
Total 2018 Other Rate Activity
 
 
 
 
 
$
457

 
 
2017 Other Rate Activity:
 
 
 
 
 
 
 
 
Colorado-Kansas
 
Kansas
 
Ad-Valorem(1)
 
$
784

 
02/01/2017
Total 2017 Other Rate Activity
 
 
 
 
 
$
784

 
 
 
(1)
The Ad Valorem filing relates to property taxes that are either over or undercollected compared to the amount included in our Kansas service area's base rates.
Other Regulation
We are regulated by various state or local public utility authorities. We are also subject to regulation by the United States Department of Transportation with respect to safety requirements in the operation and maintenance of our transmission and distribution facilities. In addition, our operations are also subject to various state and federal laws regulating environmental matters. From time to time, we receive inquiries regarding various environmental matters. We believe that our properties and operations comply with, and are operated in conformity with, applicable safety and environmental statutes and regulations. There are no administrative or judicial proceedings arising under environmental quality statutes pending or known to be contemplated by governmental agencies which would have a material adverse effect on us or our operations. Our environmental claims have arisen primarily from former manufactured gas plant sites. The Pipeline and Hazardous Materials Safety Administration (PHMSA), within the U.S. Department of Transportation, develops and enforces regulations for the safe, reliable and environmentally sound operation of the pipeline transportation system. The PHMSA pipeline safety statutes provide for states to assume safety authority over intrastate natural transmission and distribution gas pipelines. State pipeline safety programs are responsible for adopting and enforcing the federal and state pipeline safety regulations for intrastate natural gas transmission and distribution pipelines.
The Federal Energy Regulatory Commission (FERC) allows, pursuant to Section 311 of the Natural Gas Policy Act (NGA), gas transportation services through our APT assets “on behalf of” interstate pipelines or local distribution companies served by interstate pipelines, without subjecting these assets to the jurisdiction of the FERC under the NGA. Additionally, the FERC has regulatory authority over the use and release of interstate pipeline and storage capacity. The FERC also has authority to detect and prevent market manipulation and to enforce compliance with FERC’s other rules, policies and orders by companies engaged in the sale, purchase, transportation or storage of natural gas in interstate commerce. We have taken what we believe are the necessary and appropriate steps to comply with these regulations.
The SEC and the Commodities Futures Trading Commission, pursuant to the Dodd–Frank Act, established numerous regulations relating to U.S. financial markets. We enacted procedures and modified existing business practices and contractual arrangements to comply with such regulations. There are, however, some rulemaking proceedings that have not yet been finalized, including those relating to capital and margin rules for (non–cleared) swaps. We do not expect these rules to directly impact our business practices or collateral requirements. However, depending on the substance of these final rules, in addition to certain international regulatory requirements still under development that are similar to Dodd–Frank, our swap counterparties could be subject to additional and potentially significant capitalization requirements. These regulations could motivate counterparties to increase our collateral requirements or cash postings.
Competition
Although our regulated distribution operations are not currently in significant direct competition with any other distributors of natural gas to residential and commercial customers within our service areas, we do compete with other natural gas suppliers and suppliers of alternative fuels for sales to industrial customers. We compete in all aspects of our business with alternative energy sources, including, in particular, electricity. Electric utilities offer electricity as a rival energy source and

12

Table of Contents

compete for the space heating, water heating and cooking markets. Promotional incentives, improved equipment efficiencies and promotional rates all contribute to the acceptability of electrical equipment. The principal means to compete against alternative fuels is lower prices, and natural gas historically has maintained its price advantage in the residential, commercial and industrial markets.
Our pipeline and storage operations have historically faced competition from other existing intrastate pipelines seeking to provide or arrange transportation, storage and other services for customers. In the last few years, several new pipelines have been completed, which has increased the level of competition in this segment of our business.
Employees
At September 30, 2019, we had 4,776 employees, consisting of 4,645 employees in our distribution operations and 131 employees in our pipeline and storage operations.
Available Information
Our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and other reports, and amendments to those reports, and other forms that we file with or furnish to the Securities and Exchange Commission (SEC) at their website, www.sec.gov, are also available free of charge at our website, www.atmosenergy.com, under “Publications and SEC Filings” under the “Investors” tab under "Our Company", as soon as reasonably practicable, after we electronically file these reports with, or furnish these reports to, the SEC. We will also provide copies of these reports free of charge upon request to Shareholder Relations at the address and telephone number appearing below:
Shareholder Relations
Atmos Energy Corporation
P.O. Box 650205
Dallas, Texas 75265-0205
972-855-3729
Corporate Governance
In accordance with and pursuant to relevant related rules and regulations of the SEC as well as corporate governance-related listing standards of the New York Stock Exchange (NYSE), the Board of Directors of the Company has established and periodically updated our Corporate Governance Guidelines and Code of Conduct, which is applicable to all directors, officers and employees of the Company. In addition, in accordance with and pursuant to such NYSE listing standards, our Chief Executive Officer during fiscal 2019, Michael E. Haefner, certified to the New York Stock Exchange that he was not aware of any violations by the Company of NYSE corporate governance listing standards. The Board of Directors also annually reviews and updates, if necessary, the charters for each of its Audit, Human Resources and Nominating and Corporate Governance Committees. All of the foregoing documents are posted on our website, www.atmosenergy.com, under "Governance" under the "Corporate Responsibility" tab under "Our Company". We will also provide copies of all corporate governance documents free of charge upon request to Shareholder Relations at the address listed above.
ITEM 1A.
Risk Factors.
Our financial and operating results are subject to a number of risk factors, many of which are not within our control. Investors should carefully consider the following discussion of risk factors as well as other information appearing in this report. These factors include the following:
We are subject to state and local regulations that affect our operations and financial results.
We are subject to regulatory oversight from various state and local regulatory authorities in the eight states that we serve. Therefore, our returns are continuously monitored and are subject to challenge for their reasonableness by the appropriate regulatory authorities or other third-party intervenors. In the normal course of business, as a regulated entity, we often need to place assets in service and establish historical test periods before rate cases that seek to adjust our allowed returns to recover that investment can be filed. Further, the regulatory review process can be lengthy in the context of traditional ratemaking. Because of this process, we suffer the negative financial effects of having placed assets in service without the benefit of rate relief, which is commonly referred to as “regulatory lag.”
However, in the last several years, a number of regulatory authorities in the states we serve have approved rate mechanisms that provide for annual adjustments to rates that allow us to recover the cost of investments made to replace existing infrastructure or reflect changes in our cost of service. These mechanisms work to effectively reduce the regulatory lag inherent in the ratemaking process. However, regulatory lag could significantly increase if the regulatory authorities modify or terminate these rate mechanisms. The regulatory process also involves the risk that regulatory authorities may (i) review our

13

Table of Contents

purchases of natural gas and adjust the amount of our gas costs that we pass through to our customers or (ii) limit the costs we may have incurred from our cost of service that can be recovered from customers.
We are also subject to laws, regulations and other legal requirements enacted or adopted by federal, state and local governmental authorities relating to protection of the environment and health and safety matters, including those that govern discharges of substances into the air and water, the management and disposal of hazardous substances and waste, the clean-up of contaminated sites, groundwater quality and availability, plant and wildlife protection, as well as work practices related to employee health and safety. Environmental legislation also requires that our facilities, sites and other properties associated with our operations be operated, maintained, abandoned and reclaimed to the satisfaction of applicable regulatory authorities. Failure to comply with these laws, regulations, permits and licenses may expose us to fines, penalties or interruptions in our operations that could be significant to our financial results. In addition, existing environmental regulations may be revised or our operations may become subject to new regulations.
Some of our operations are subject to increased federal regulatory oversight that could affect our operations and financial results.
FERC has regulatory authority over some of our operations, including the use and release of interstate pipeline and storage capacity. FERC has adopted rules designed to prevent market power abuse and market manipulation and to promote compliance with FERC’s other rules, policies and orders by companies engaged in the sale, purchase, transportation or storage of natural gas in interstate commerce. These rules carry increased penalties for violations. Although we have taken steps to structure current and future transactions to comply with applicable current FERC regulations, changes in FERC regulations or their interpretation by FERC or additional regulations issued by FERC in the future could also adversely affect our business, financial condition or financial results.
We may experience increased federal, state and local regulation of the safety of our operations.
The safety and protection of the public, our customers and our employees is our top priority. We constantly monitor and maintain our pipeline and distribution systems to ensure that natural gas is delivered safely, reliably and efficiently through our network of more than 75,000 miles of distribution and transmission lines. As in recent years, natural gas distribution and pipeline companies are continuing to encounter increasing federal, state and local oversight of the safety of their operations. Although we believe these are costs ultimately recoverable through our rates, the costs of complying with new laws and regulations may have at least a short-term adverse impact on our operating costs and financial results.
We may incur significant costs and liabilities resulting from pipeline integrity and other similar programs and related repairs.
PHMSA requires pipeline operators to develop integrity management programs to comprehensively evaluate certain areas along their pipelines and to take additional measures to protect pipeline segments located in “high consequence areas” where a leak or rupture could potentially do the most harm. As pipeline operator, the Company will be required to:
perform ongoing assessments of pipeline integrity;
identify and characterize applicable threats to pipeline segments that could impact a “high consequence area”;
improve data collection, integration and analysis;
repair and remediate the pipeline as necessary; and
implement preventative and mitigating actions.
The Company incurs significant costs associated with its compliance with existing PHMSA and comparable state regulations. Although we believe these are costs ultimately recoverable through our rates, the costs of complying with new laws and regulations may have at least a short-term adverse impact on our operating costs and financial results. For example, the adoption of new regulations requiring more comprehensive or stringent safety standards could require installation of new or modified safety controls, new capital projects, or accelerated maintenance programs, all of which could require a potentially significant increase in operating costs.
Distributing, transporting and storing natural gas involve risks that may result in accidents and additional operating costs.
Our operations involve a number of hazards and operating risks inherent in storing and transporting natural gas that could affect the public safety and reliability of our distribution system. While Atmos Energy, with the support from each of its regulatory commissions, is accelerating the replacement of aging pipeline infrastructure, operating issues such as as leaks, accidents, equipment problems and incidents, including explosions and fire, could result in legal liability, repair and remediation costs, increased operating costs, significant increased capital expenditures, regulatory fines and penalties and other costs and a loss of customer confidence. We maintain liability and property insurance coverage in place for many of these hazards and risks. However, because some of our transmission pipeline and storage facilities are near or are in populated areas,

14

Table of Contents

any loss of human life or adverse financial results resulting from such events could be large. If these events were not fully covered by our general liability and property insurance, which policies are subject to certain limits and deductibles, our operations or financial results could be adversely affected.
Our growth in the future may be limited by the nature of our business, which requires extensive capital spending.
Our operations are capital-intensive. We must make significant capital expenditures on a long-term basis to modernize our distribution and transmission system to improve the safety and reliability and to comply with the safety rules and regulations issued by the regulatory authorities responsible for the service areas we operate. In addition, we must continually build new capacity to serve the growing needs of the communities we serve. The magnitude of these expenditures may be affected by a number of factors, including new regulations, the general state of the economy and weather.
The liquidity required to fund our working capital, capital expenditures and other cash needs is provided from a combination of internally generated cash flows and external debt and equity financing. The cost and availability of borrowing funds from third party lenders or issuing equity is dependent on the liquidity of the credit markets, interest rates and other market conditions. This in turn may limit the amount of funds we can invest in our infrastructure.
The Company is dependent on continued access to the credit and capital markets to execute our business strategy.
Our long-term debt is currently rated as “investment grade” by Standard & Poor’s Corporation and Moody’s Investors Service, Inc. Similar to most companies, we rely upon access to both short-term and long-term credit and capital markets to satisfy our liquidity requirements. If adverse credit conditions were to cause a significant limitation on our access to the private credit and public capital markets, we could see a reduction in our liquidity. A significant reduction in our liquidity could in turn trigger a negative change in our ratings outlook or even a reduction in our credit ratings by one or more of the credit rating agencies. Such a downgrade could further limit our access to private credit and/or public capital markets and increase our costs of borrowing.
While we believe we can meet our capital requirements from our operations and the sources of financing available to us, we can provide no assurance that we will continue to be able to do so in the future, especially if the market price of natural gas increases significantly in the near term. The future effects on our business, liquidity and financial results of a deterioration of current conditions in the credit and capital markets could be material and adverse to us, both in the ways described above or in other ways that we do not currently anticipate.
We are exposed to market risks that are beyond our control, which could adversely affect our financial results.
We are subject to market risks beyond our control, including (i) commodity price volatility caused by market supply and demand dynamics, counterparty performance or counterparty creditworthiness, and (ii) interest rate risk. We are generally insulated from commodity price risk through our purchased gas cost mechanisms. With respect to interest rate risk, we have been operating in a relatively low interest-rate environment in recent years compared to historical norms for both short and long-term interest rates. However, increases in interest rates could adversely affect our future financial results to the extent that we do not recover our actual interest expense in our rates.
The concentration of our operations in the State of Texas exposes our operations and financial results to economic conditions, weather patterns and regulatory decisions in Texas.
Approximately 70 percent of our consolidated operations are located in the State of Texas. This concentration of our business in Texas means that our operations and financial results may be significantly affected by changes in the Texas economy in general, weather patterns and regulatory decisions by state and local regulatory authorities in Texas.
A deterioration in economic conditions could adversely affect our customers and negatively impact our financial results.
Any adverse changes in economic conditions in the United States, especially in the states in which we operate, could adversely affect the financial resources of many domestic households. As a result, our customers could seek to use less gas and it may be more difficult for them to pay their gas bills. This would likely lead to slower collections and higher than normal levels of accounts receivable. This, in turn, could increase our financing requirements. Additionally, should economic conditions deteriorate, our industrial customers could seek alternative energy sources, which could result in lower sales volumes.
Increased gas costs could adversely impact our customer base and customer collections and increase our level of indebtedness.
Rapid increases in the costs of purchased gas would cause us to experience a significant increase in short-term debt. We must pay suppliers for gas when it is purchased, which can be significantly in advance of when these costs may be recovered through the collection of monthly customer bills for gas delivered. Increases in purchased gas costs also slow our natural gas distribution collection efforts as customers are more likely to delay the payment of their gas bills, leading to higher than normal

15

Table of Contents

accounts receivable. This could result in higher short-term debt levels, greater collection efforts and increased bad debt expense.
If contracted gas supplies, interstate pipeline and/or storage services are not available or delivered in a timely manner, our ability to meet our customers’ natural gas requirements may be impaired and our financial condition may be adversely affected.
In order to meet our customers’ annual and seasonal natural gas demands, we must obtain a sufficient supply of natural gas, interstate pipeline capacity and storage capacity. If we are unable to obtain these, either from our suppliers’ inability to deliver the contracted commodity or the inability to secure replacement quantities, our financial condition and results of operations may be adversely affected. If a substantial disruption to or reduction in interstate natural gas pipelines’ transmission and storage capacity occurred due to operational failures or disruptions, legislative or regulatory actions, hurricanes, tornadoes, floods, terrorist or cyber-attacks or acts of war, our operations or financial results could be adversely affected.
Our operations are subject to increased competition.
In residential and commercial customer markets, our distribution operations compete with other energy products, such as electricity and propane. Our primary product competition is with electricity for heating, water heating and cooking. Increases in the price of natural gas could negatively impact our competitive position by decreasing the price benefits of natural gas to the consumer. This could adversely impact our business if our customer growth slows or if our customers further conserve their use of gas, resulting in reduced gas purchases and customer billings.
In the case of industrial customers, such as manufacturing plants, adverse economic conditions, including higher gas costs, could cause these customers to use alternative sources of energy, such as electricity, or bypass our systems in favor of special competitive contracts with lower per-unit costs. Our pipeline and storage operations historically have faced limited competition from other existing intrastate pipelines and gas marketers seeking to provide or arrange transportation, storage and other services for customers. However, in the last few years, several new pipelines have been completed, which has increased the level of competition in this segment of our business.
Adverse weather conditions could affect our operations or financial results.
We have weather-normalized rates for approximately 97 percent of our residential and commercial meters in our distribution operations, which substantially mitigates the adverse effects of warmer-than-normal weather for meters in those service areas. However, there is no assurance that we will continue to receive such regulatory protection from adverse weather in our rates in the future. The loss of such weather-normalized rates could have an adverse effect on our operations and financial results. In addition, our operating results may continue to vary somewhat with the actual temperatures during the winter heating season. Additionally, sustained cold weather could challenge our ability to adequately meet customer demand in our operations.
The costs of providing health care benefits, pension and postretirement health care benefits and related funding requirements may increase substantially.
We provide health care benefits, a cash-balance pension plan and postretirement health care benefits to eligible full-time employees. The costs of providing health care benefits to our employees could significantly increase over time due to rapidly increasing health care inflation, and any future legislative changes related to the provision of health care benefits. The impact of additional costs which are likely to be passed on to the Company is difficult to measure at this time.
The costs of providing a cash-balance pension plan to eligible full-time employees prior to 2011 and postretirement health care benefits to eligible full-time employees and related funding requirements could be influenced by changes in the market value of the assets funding our pension and postretirement health care plans. Any significant declines in the value of these investments due to sustained declines in equity markets or a reduction in bond yields could increase the costs of our pension and postretirement health care plans and related funding requirements in the future. Further, our costs of providing such benefits and related funding requirements are also subject to a number of factors, including (i) changing demographics, including longer life expectancy of beneficiaries and an expected increase in the number of eligible former employees over the next five to ten years; (ii) various actuarial calculations and assumptions which may differ materially from actual results due primarily to changing market and economic conditions, including changes in interest rates, and higher or lower withdrawal rates; and (iii) future government regulation.
The costs to the Company of providing these benefits and related funding requirements could also increase materially in the future, should there be a material reduction in the amount of the recovery of these costs through our rates or should significant delays develop in the timing of the recovery of such costs, which could adversely affect our financial results.

16

Table of Contents

The inability to continue to hire, train and retain operational, technical and managerial personnel could adversely affect our results of operations.
Although the average age of the employee base of Atmos Energy is not significantly changing year over year, there are still a number of employees who will become eligible to retire within the next five to 10 years. If we were unable to hire appropriate personnel or contractors to fill future needs, the Company could encounter operating challenges and increased costs, primarily due to a loss of knowledge, errors due to inexperience or the lengthy time period typically required to adequately train replacement personnel. In addition, higher costs could result from loss of productivity or increased safety compliance issues. The inability to hire, train and retain new operational, technical and managerial personnel adequately and to transfer institutional knowledge and expertise could adversely affect our ability to manage and operate our business. If we were unable to hire, train and retain appropriately qualified personnel, our results of operations could be adversely affected.
The operations and financial results of the Company could be adversely impacted as a result of climate change.
As climate change occurs, our businesses could be adversely impacted, although we believe it is likely that any such resulting impacts would occur very gradually over a long period of time and thus would be difficult to quantify with any degree of specificity. Such climate change could cause shifts in population, including customers moving away from our service territories.
It could also result in more frequent and more severe weather events, such as hurricanes and tornadoes, which could increase our costs to repair damaged facilities and restore service to our customers. If we were unable to deliver natural gas to our customers, our financial results would be impacted by lost revenues, and we generally would have to seek approval from regulators to recover restoration costs. To the extent we would be unable to recover those costs, or if higher rates resulting from our recovery of such costs would result in reduced demand for our services, our future business, financial condition or financial results could be adversely impacted.
Greenhouse gas emissions or other legislation or regulations intended to address climate change could increase our operating costs, adversely affecting our financial results, growth, cash flows and results of operations.
Federal, regional and/or state legislative and/or regulatory initiatives may attempt to control or limit the causes of climate change, including greenhouse gas emissions, such as carbon dioxide and methane. Such laws or regulations could impose costs tied to greenhouse gas emissions, operational requirements or restrictions, or additional charges to fund energy efficiency activities. They could also provide a cost advantage to alternative energy sources, impose costs or restrictions on end users of natural gas, or result in other costs or requirements, such as costs associated with the adoption of new infrastructure and technology to respond to new mandates. The focus on climate change could adversely impact the reputation of fossil fuel products or services. The occurrence of the foregoing events could put upward pressure on the cost of natural gas relative to other energy sources, increase our costs and the prices we charge to customers, reduce the demand for natural gas or cause fuel switching to other energy sources, and impact the competitive position of natural gas and the ability to serve new or existing customers, adversely affecting our business, results of operations and cash flows.
Increased dependence on technology may hinder the Company’s business operations and adversely affect its financial condition and results of operations if such technologies fail.
Over the last several years, the Company has implemented or acquired a variety of technological tools including both Company-owned information technology and technological services provided by outside parties. These tools and systems support critical functions including, scheduling and dispatching of service technicians, automated meter reading systems, customer care and billing, operational plant logistics, management reporting, and external financial reporting. The failure of these or other similarly important technologies, or the Company’s inability to have these technologies supported, updated, expanded, or integrated into other technologies, could hinder its business operations and adversely impact its financial condition and results of operations.
Although the Company has, when possible, developed alternative sources of technology and built redundancy into its computer networks and tools, there can be no assurance that these efforts would protect against all potential issues related to the loss of any such technologies.
Cyber-attacks or acts of cyber-terrorism could disrupt our business operations and information technology systems or result in the loss or exposure of confidential or sensitive customer, employee or Company information.
Our business operations and information technology systems may be vulnerable to an attack by individuals or organizations intending to disrupt our business operations and information technology systems, even though the Company has implemented policies, procedures and controls to prevent and detect these activities. We use our information technology systems to manage our distribution and intrastate pipeline and storage operations and other business processes. Disruption of those systems could adversely impact our ability to safely deliver natural gas to our customers, operate our pipeline and storage

17

Table of Contents

systems or serve our customers timely. Accordingly, if such an attack or act of terrorism were to occur, our operations and financial results could be adversely affected.
In addition, we use our information technology systems to protect confidential or sensitive customer, employee and Company information developed and maintained in the normal course of our business. Any attack on such systems that would result in the unauthorized release of customer, employee or other confidential or sensitive data could have a material adverse effect on our business reputation, increase our costs and expose us to additional material legal claims and liability. Even though we have insurance coverage in place for many of these cyber-related risks, if such an attack or act of terrorism were to occur, our operations and financial results could be adversely affected to the extent not fully covered by such insurance coverage.
Natural disasters, terrorist activities or other significant events could adversely affect our operations or financial results.
Natural disasters are always a threat to our assets and operations. In addition, the threat of terrorist activities could lead to increased economic instability and volatility in the price of natural gas that could affect our operations. Also, companies in our industry may face a heightened risk of exposure to actual acts of terrorism, which could subject our operations to increased risks. As a result, the availability of insurance covering such risks may become more limited, which could increase the risk that an event could adversely affect our operations or financial results.
ITEM 1B.
Unresolved Staff Comments.
Not applicable.
ITEM 2.
Properties.
Distribution, transmission and related assets
At September 30, 2019, in our distribution segment, we owned an aggregate of 70,875 miles of underground distribution and transmission mains throughout our distribution systems. These mains are located on easements or rights-of-way. We maintain our mains through a program of continuous inspection and repair and believe that our system of mains is in good condition. Through our pipeline and storage segment we owned 5,669 miles of gas transmission lines as well.
Storage Assets
We own underground gas storage facilities in several states to supplement the supply of natural gas in periods of peak demand. The following table summarizes certain information regarding our underground gas storage facilities at September 30, 2019:
State
 
Usable Capacity
(Mcf)
 
Cushion
Gas
(Mcf)(1)
 
Total
Capacity
(Mcf)
 
Maximum
Daily Delivery
Capability
(Mcf)
Distribution Segment
 
 
 
 
 
 
 
 
Kentucky
 
7,956,991

 
9,562,283

 
17,519,274

 
158,100

Kansas
 
3,239,000

 
2,300,000

 
5,539,000

 
45,000

Mississippi
 
1,907,571

 
2,442,917

 
4,350,488

 
31,000

Total
 
13,103,562

 
14,305,200

 
27,408,762

 
234,100

Pipeline and Storage Segment
 
 
 
 
 


 
 
Texas
 
46,083,549

 
15,878,025

 
61,961,574

 
1,710,000

Louisiana
 
411,040

 
256,900

 
667,940

 
56,000

Total
 
46,494,589

 
16,134,925

 
62,629,514

 
1,766,000

Total
 
59,598,151

 
30,440,125

 
90,038,276

 
2,000,100

 
(1)
Cushion gas represents the volume of gas that must be retained in a facility to maintain reservoir pressure.


18

Table of Contents

Additionally, we contract for storage service in underground storage facilities on many of the interstate and intrastate pipelines serving us to supplement our proprietary storage capacity. The following table summarizes our contracted storage capacity at September 30, 2019:
Segment
 
Division/Company
 
Maximum
Storage
Quantity
(MMBtu)
 
Maximum
Daily
Withdrawal
Quantity
(MDWQ)(1)
Distribution Segment
 
 
 
 
 
 
 
 
Colorado-Kansas Division
 
6,343,728

 
147,965

 
 
Kentucky/Mid-States Division
 
8,175,103

 
226,739

 
 
Louisiana Division
 
2,514,875

 
173,765

 
 
Mid-Tex Division
 
4,000,000

 
150,000

 
 
Mississippi Division
 
5,099,536

 
164,764

 
 
West Texas Division
 
5,500,000

 
176,000

Total
 
31,633,242

 
1,039,233

Pipeline and Storage Segment
 
 
 
 
 
 
Trans Louisiana Gas Pipeline, Inc.
 
1,000,000

 
47,500

 
 
 
 
 
Total Contracted Storage Capacity
 
32,633,242

 
1,086,733

 
(1)
Maximum daily withdrawal quantity (MDWQ) amounts will fluctuate depending upon the season and the month. Unless otherwise noted, MDWQ amounts represent the MDWQ amounts as of November 1, which is the beginning of the winter heating season.
Offices
Our administrative offices and corporate headquarters are consolidated in a leased facility in Dallas, Texas. We also maintain field offices throughout our service territory, some of which are located in leased facilities.
ITEM 3.
Legal Proceedings.
See Note 12 to the consolidated financial statements, which is incorporated in this Item 3 by reference.

ITEM 4.
Mine Safety Disclosures.
Not applicable.

PART II
 
ITEM 5.
Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.
Our stock trades on the New York Stock Exchange under the trading symbol “ATO.” The dividends paid per share of our common stock for fiscal 2019 and 2018 are listed below.
 
 
Fiscal 2019
 
Fiscal 2018
Quarter ended:
 
 
 
 
December 31
 
$
0.525

 
$
0.485

March 31
 
0.525

 
0.485

June 30
 
0.525

 
0.485

September 30
 
0.525

 
0.485

 
 
$
2.10

 
$
1.94

Dividends are payable at the discretion of our Board of Directors out of legally available funds. The Board of Directors typically declares dividends in the same fiscal quarter in which they are paid. As of October 31, 2019, there were 11,806 holders of record of our common stock. Future payments of dividends, and the amounts of these dividends, will depend on our

19

Table of Contents

financial condition, results of operations, capital requirements and other factors. We sold no securities during fiscal 2019 that were not registered under the Securities Act of 1933, as amended.
Performance Graph
    
The performance graph and table below compares the yearly percentage change in our total return to shareholders for the last five fiscal years with the total return of the S&P 500 Stock Index (S&P 500) and the cumulative total return of a customized peer company group, the Comparison Company Index. The Comparison Company Index is comprised of natural gas distribution companies with similar revenues, market capitalizations and asset bases to that of the Company. The graph and table below assume that $100.00 was invested on September 30, 2014 in our common stock, the S&P 500 and in the common stock of the companies in the Comparison Company Indices, as well as a reinvestment of dividends paid on such investments throughout the period.

Comparison of Five-Year Cumulative Total Return
among Atmos Energy Corporation, S&P 500 Index
and Comparison Company Index
chart-324dc4ac94a65941867.jpg
 
Cumulative Total Return
 
9/30/2014
 
9/30/2015
 
9/30/2016
 
9/30/2017
 
9/30/2018
 
9/30/2019
Atmos Energy Corporation
100.00

 
125.54

 
164.58

 
189.56

 
217.10

 
268.76

S&P 500 Stock Index
100.00

 
99.39

 
114.72

 
136.07

 
160.44

 
167.27

Comparison Company Index
100.00

 
110.80

 
136.77

 
159.21

 
168.54

 
219.86


The Comparison Company Index reflects the cumulative total return of companies in our peer group, which is comprised of a hybrid group of utility companies, primarily natural gas distribution companies, recommended by our independent executive compensation consulting firm and approved by the Board of Directors. The companies in the index are Alliant Energy Corporation, Ameren Corporation, CenterPoint Energy, Inc., CMS Energy Corporation, DTE Energy Company, National Fuel Gas Company, NiSource Inc., ONE Gas, Inc., Spire Inc. (formerly The Laclede Group, Inc.), Vectren Corporation(1), WEC Energy Group, Inc., and Xcel Energy, Inc.

(1)
Vectren Corporation merged with CenterPoint Energy, Inc. prior to September 30, 2019. As a result, the cumulative total return of Vectren Corporation is not included in the Comparison Company Index represented in the graph above.

20

Table of Contents


The following table sets forth the number of securities authorized for issuance under our equity compensation plans at September 30, 2019.
 
Number of
securities to be issued
upon exercise of
outstanding options, restricted stock units,