0001488139 12/31 2025 Q3 FALSE http://fasb.org/us-gaap/2025#PropertyPlantAndEquipmentOtherNet http://fasb.org/us-gaap/2025#PropertyPlantAndEquipmentOtherNet http://fasb.org/us-gaap/2025#LongTermDebtCurrent http://fasb.org/us-gaap/2025#LongTermDebtCurrent http://fasb.org/us-gaap/2025#LongTermDebtAndCapitalLeaseObligations http://fasb.org/us-gaap/2025#LongTermDebtAndCapitalLeaseObligations P3Y August 20, 2026 330 xbrli:shares iso4217:USD iso4217:USD xbrli:shares xbrli:pure amrc:lease amrc:project amrc:fund amrc:energy_asset 0001488139 2025-01-01 2025-09-30 0001488139 us-gaap:CommonClassAMember 2025-10-30 0001488139 us-gaap:CommonClassBMember 2025-10-30 0001488139 2025-09-30 0001488139 2024-12-31 0001488139 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2025-09-30 0001488139 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2024-12-31 0001488139 us-gaap:CommonClassAMember 2024-12-31 0001488139 us-gaap:CommonClassAMember 2025-09-30 0001488139 us-gaap:CommonClassBMember 2024-12-31 0001488139 us-gaap:CommonClassBMember 2025-09-30 0001488139 2025-07-01 2025-09-30 0001488139 2024-07-01 2024-09-30 0001488139 2024-01-01 2024-09-30 0001488139 2024-06-30 0001488139 us-gaap:CommonClassAMember us-gaap:CommonStockMember 2024-06-30 0001488139 us-gaap:CommonClassBMember us-gaap:CommonStockMember 2024-06-30 0001488139 us-gaap:AdditionalPaidInCapitalMember 2024-06-30 0001488139 us-gaap:RetainedEarningsMember 2024-06-30 0001488139 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2024-06-30 0001488139 us-gaap:TreasuryStockCommonMember 2024-06-30 0001488139 us-gaap:NoncontrollingInterestMember 2024-06-30 0001488139 us-gaap:CommonClassAMember us-gaap:CommonStockMember 2024-07-01 2024-09-30 0001488139 us-gaap:AdditionalPaidInCapitalMember 2024-07-01 2024-09-30 0001488139 us-gaap:TreasuryStockCommonMember 2024-07-01 2024-09-30 0001488139 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2024-07-01 2024-09-30 0001488139 us-gaap:NoncontrollingInterestMember 2024-07-01 2024-09-30 0001488139 us-gaap:RetainedEarningsMember 2024-07-01 2024-09-30 0001488139 2024-09-30 0001488139 us-gaap:CommonClassAMember us-gaap:CommonStockMember 2024-09-30 0001488139 us-gaap:CommonClassBMember us-gaap:CommonStockMember 2024-09-30 0001488139 us-gaap:AdditionalPaidInCapitalMember 2024-09-30 0001488139 us-gaap:RetainedEarningsMember 2024-09-30 0001488139 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2024-09-30 0001488139 us-gaap:TreasuryStockCommonMember 2024-09-30 0001488139 us-gaap:NoncontrollingInterestMember 2024-09-30 0001488139 2025-06-30 0001488139 us-gaap:CommonClassAMember us-gaap:CommonStockMember 2025-06-30 0001488139 us-gaap:CommonClassBMember us-gaap:CommonStockMember 2025-06-30 0001488139 us-gaap:AdditionalPaidInCapitalMember 2025-06-30 0001488139 us-gaap:RetainedEarningsMember 2025-06-30 0001488139 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2025-06-30 0001488139 us-gaap:TreasuryStockCommonMember 2025-06-30 0001488139 us-gaap:NoncontrollingInterestMember 2025-06-30 0001488139 us-gaap:CommonClassAMember us-gaap:CommonStockMember 2025-07-01 2025-09-30 0001488139 us-gaap:AdditionalPaidInCapitalMember 2025-07-01 2025-09-30 0001488139 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2025-07-01 2025-09-30 0001488139 us-gaap:NoncontrollingInterestMember 2025-07-01 2025-09-30 0001488139 us-gaap:RetainedEarningsMember 2025-07-01 2025-09-30 0001488139 us-gaap:CommonClassAMember us-gaap:CommonStockMember 2025-09-30 0001488139 us-gaap:CommonClassBMember us-gaap:CommonStockMember 2025-09-30 0001488139 us-gaap:AdditionalPaidInCapitalMember 2025-09-30 0001488139 us-gaap:RetainedEarningsMember 2025-09-30 0001488139 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2025-09-30 0001488139 us-gaap:TreasuryStockCommonMember 2025-09-30 0001488139 us-gaap:NoncontrollingInterestMember 2025-09-30 0001488139 2023-12-31 0001488139 us-gaap:CommonClassAMember us-gaap:CommonStockMember 2023-12-31 0001488139 us-gaap:CommonClassBMember us-gaap:CommonStockMember 2023-12-31 0001488139 us-gaap:AdditionalPaidInCapitalMember 2023-12-31 0001488139 us-gaap:RetainedEarningsMember 2023-12-31 0001488139 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2023-12-31 0001488139 us-gaap:TreasuryStockCommonMember 2023-12-31 0001488139 us-gaap:NoncontrollingInterestMember 2023-12-31 0001488139 us-gaap:CommonClassAMember us-gaap:CommonStockMember 2024-01-01 2024-09-30 0001488139 us-gaap:AdditionalPaidInCapitalMember 2024-01-01 2024-09-30 0001488139 us-gaap:TreasuryStockCommonMember 2024-01-01 2024-09-30 0001488139 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2024-01-01 2024-09-30 0001488139 us-gaap:NoncontrollingInterestMember 2024-01-01 2024-09-30 0001488139 us-gaap:RetainedEarningsMember 2024-01-01 2024-09-30 0001488139 us-gaap:CommonClassAMember us-gaap:CommonStockMember 2024-12-31 0001488139 us-gaap:CommonClassBMember us-gaap:CommonStockMember 2024-12-31 0001488139 us-gaap:AdditionalPaidInCapitalMember 2024-12-31 0001488139 us-gaap:RetainedEarningsMember 2024-12-31 0001488139 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2024-12-31 0001488139 us-gaap:TreasuryStockCommonMember 2024-12-31 0001488139 us-gaap:NoncontrollingInterestMember 2024-12-31 0001488139 us-gaap:CommonClassAMember us-gaap:CommonStockMember 2025-01-01 2025-09-30 0001488139 us-gaap:AdditionalPaidInCapitalMember 2025-01-01 2025-09-30 0001488139 us-gaap:TreasuryStockCommonMember 2025-01-01 2025-09-30 0001488139 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2025-01-01 2025-09-30 0001488139 us-gaap:NoncontrollingInterestMember 2025-01-01 2025-09-30 0001488139 us-gaap:RetainedEarningsMember 2025-01-01 2025-09-30 0001488139 amrc:PowinLLCMember 2025-09-30 0001488139 amrc:ProjectRevenueMember amrc:NorthAmericaRegionsMember 2025-07-01 2025-09-30 0001488139 amrc:ProjectRevenueMember amrc:USFederalMember 2025-07-01 2025-09-30 0001488139 amrc:ProjectRevenueMember amrc:RenewableFuelsMember 2025-07-01 2025-09-30 0001488139 amrc:ProjectRevenueMember amrc:EuropeSegmentMember 2025-07-01 2025-09-30 0001488139 amrc:ProjectRevenueMember us-gaap:AllOtherSegmentsMember 2025-07-01 2025-09-30 0001488139 amrc:ProjectRevenueMember 2025-07-01 2025-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:NorthAmericaRegionsMember 2025-07-01 2025-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:USFederalMember 2025-07-01 2025-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:RenewableFuelsMember 2025-07-01 2025-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:EuropeSegmentMember 2025-07-01 2025-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember us-gaap:AllOtherSegmentsMember 2025-07-01 2025-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember 2025-07-01 2025-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:NorthAmericaRegionsMember 2025-07-01 2025-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:USFederalMember 2025-07-01 2025-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:RenewableFuelsMember 2025-07-01 2025-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:EuropeSegmentMember 2025-07-01 2025-09-30 0001488139 amrc:EnergyAssetsRevenueMember us-gaap:AllOtherSegmentsMember 2025-07-01 2025-09-30 0001488139 amrc:EnergyAssetsRevenueMember 2025-07-01 2025-09-30 0001488139 amrc:OtherRevenueMember amrc:NorthAmericaRegionsMember 2025-07-01 2025-09-30 0001488139 amrc:OtherRevenueMember amrc:USFederalMember 2025-07-01 2025-09-30 0001488139 amrc:OtherRevenueMember amrc:RenewableFuelsMember 2025-07-01 2025-09-30 0001488139 amrc:OtherRevenueMember amrc:EuropeSegmentMember 2025-07-01 2025-09-30 0001488139 amrc:OtherRevenueMember us-gaap:AllOtherSegmentsMember 2025-07-01 2025-09-30 0001488139 amrc:OtherRevenueMember 2025-07-01 2025-09-30 0001488139 amrc:NorthAmericaRegionsMember 2025-07-01 2025-09-30 0001488139 amrc:USFederalMember 2025-07-01 2025-09-30 0001488139 amrc:RenewableFuelsMember 2025-07-01 2025-09-30 0001488139 amrc:EuropeSegmentMember 2025-07-01 2025-09-30 0001488139 us-gaap:AllOtherSegmentsMember 2025-07-01 2025-09-30 0001488139 amrc:ProjectRevenueMember amrc:NorthAmericaRegionsMember 2024-07-01 2024-09-30 0001488139 amrc:ProjectRevenueMember amrc:USFederalMember 2024-07-01 2024-09-30 0001488139 amrc:ProjectRevenueMember amrc:RenewableFuelsMember 2024-07-01 2024-09-30 0001488139 amrc:ProjectRevenueMember amrc:EuropeSegmentMember 2024-07-01 2024-09-30 0001488139 amrc:ProjectRevenueMember us-gaap:AllOtherSegmentsMember 2024-07-01 2024-09-30 0001488139 amrc:ProjectRevenueMember 2024-07-01 2024-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:NorthAmericaRegionsMember 2024-07-01 2024-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:USFederalMember 2024-07-01 2024-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:RenewableFuelsMember 2024-07-01 2024-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:EuropeSegmentMember 2024-07-01 2024-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember us-gaap:AllOtherSegmentsMember 2024-07-01 2024-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember 2024-07-01 2024-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:NorthAmericaRegionsMember 2024-07-01 2024-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:USFederalMember 2024-07-01 2024-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:RenewableFuelsMember 2024-07-01 2024-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:EuropeSegmentMember 2024-07-01 2024-09-30 0001488139 amrc:EnergyAssetsRevenueMember us-gaap:AllOtherSegmentsMember 2024-07-01 2024-09-30 0001488139 amrc:EnergyAssetsRevenueMember 2024-07-01 2024-09-30 0001488139 amrc:OtherRevenueMember amrc:NorthAmericaRegionsMember 2024-07-01 2024-09-30 0001488139 amrc:OtherRevenueMember amrc:USFederalMember 2024-07-01 2024-09-30 0001488139 amrc:OtherRevenueMember amrc:RenewableFuelsMember 2024-07-01 2024-09-30 0001488139 amrc:OtherRevenueMember amrc:EuropeSegmentMember 2024-07-01 2024-09-30 0001488139 amrc:OtherRevenueMember us-gaap:AllOtherSegmentsMember 2024-07-01 2024-09-30 0001488139 amrc:OtherRevenueMember 2024-07-01 2024-09-30 0001488139 amrc:NorthAmericaRegionsMember 2024-07-01 2024-09-30 0001488139 amrc:USFederalMember 2024-07-01 2024-09-30 0001488139 amrc:RenewableFuelsMember 2024-07-01 2024-09-30 0001488139 amrc:EuropeSegmentMember 2024-07-01 2024-09-30 0001488139 us-gaap:AllOtherSegmentsMember 2024-07-01 2024-09-30 0001488139 amrc:ProjectRevenueMember amrc:NorthAmericaRegionsMember 2025-01-01 2025-09-30 0001488139 amrc:ProjectRevenueMember amrc:USFederalMember 2025-01-01 2025-09-30 0001488139 amrc:ProjectRevenueMember amrc:RenewableFuelsMember 2025-01-01 2025-09-30 0001488139 amrc:ProjectRevenueMember amrc:EuropeSegmentMember 2025-01-01 2025-09-30 0001488139 amrc:ProjectRevenueMember us-gaap:AllOtherSegmentsMember 2025-01-01 2025-09-30 0001488139 amrc:ProjectRevenueMember 2025-01-01 2025-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:NorthAmericaRegionsMember 2025-01-01 2025-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:USFederalMember 2025-01-01 2025-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:RenewableFuelsMember 2025-01-01 2025-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:EuropeSegmentMember 2025-01-01 2025-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember us-gaap:AllOtherSegmentsMember 2025-01-01 2025-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember 2025-01-01 2025-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:NorthAmericaRegionsMember 2025-01-01 2025-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:USFederalMember 2025-01-01 2025-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:RenewableFuelsMember 2025-01-01 2025-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:EuropeSegmentMember 2025-01-01 2025-09-30 0001488139 amrc:EnergyAssetsRevenueMember us-gaap:AllOtherSegmentsMember 2025-01-01 2025-09-30 0001488139 amrc:EnergyAssetsRevenueMember 2025-01-01 2025-09-30 0001488139 amrc:OtherRevenueMember amrc:NorthAmericaRegionsMember 2025-01-01 2025-09-30 0001488139 amrc:OtherRevenueMember amrc:USFederalMember 2025-01-01 2025-09-30 0001488139 amrc:OtherRevenueMember amrc:RenewableFuelsMember 2025-01-01 2025-09-30 0001488139 amrc:OtherRevenueMember amrc:EuropeSegmentMember 2025-01-01 2025-09-30 0001488139 amrc:OtherRevenueMember us-gaap:AllOtherSegmentsMember 2025-01-01 2025-09-30 0001488139 amrc:OtherRevenueMember 2025-01-01 2025-09-30 0001488139 amrc:NorthAmericaRegionsMember 2025-01-01 2025-09-30 0001488139 amrc:USFederalMember 2025-01-01 2025-09-30 0001488139 amrc:RenewableFuelsMember 2025-01-01 2025-09-30 0001488139 amrc:EuropeSegmentMember 2025-01-01 2025-09-30 0001488139 us-gaap:AllOtherSegmentsMember 2025-01-01 2025-09-30 0001488139 amrc:ProjectRevenueMember amrc:NorthAmericaRegionsMember 2024-01-01 2024-09-30 0001488139 amrc:ProjectRevenueMember amrc:USFederalMember 2024-01-01 2024-09-30 0001488139 amrc:ProjectRevenueMember amrc:RenewableFuelsMember 2024-01-01 2024-09-30 0001488139 amrc:ProjectRevenueMember amrc:EuropeSegmentMember 2024-01-01 2024-09-30 0001488139 amrc:ProjectRevenueMember us-gaap:AllOtherSegmentsMember 2024-01-01 2024-09-30 0001488139 amrc:ProjectRevenueMember 2024-01-01 2024-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:NorthAmericaRegionsMember 2024-01-01 2024-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:USFederalMember 2024-01-01 2024-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:RenewableFuelsMember 2024-01-01 2024-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember amrc:EuropeSegmentMember 2024-01-01 2024-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember us-gaap:AllOtherSegmentsMember 2024-01-01 2024-09-30 0001488139 amrc:OperationsAndMaintenanceRevenueMember 2024-01-01 2024-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:NorthAmericaRegionsMember 2024-01-01 2024-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:USFederalMember 2024-01-01 2024-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:RenewableFuelsMember 2024-01-01 2024-09-30 0001488139 amrc:EnergyAssetsRevenueMember amrc:EuropeSegmentMember 2024-01-01 2024-09-30 0001488139 amrc:EnergyAssetsRevenueMember us-gaap:AllOtherSegmentsMember 2024-01-01 2024-09-30 0001488139 amrc:EnergyAssetsRevenueMember 2024-01-01 2024-09-30 0001488139 amrc:OtherRevenueMember amrc:NorthAmericaRegionsMember 2024-01-01 2024-09-30 0001488139 amrc:OtherRevenueMember amrc:USFederalMember 2024-01-01 2024-09-30 0001488139 amrc:OtherRevenueMember amrc:RenewableFuelsMember 2024-01-01 2024-09-30 0001488139 amrc:OtherRevenueMember amrc:EuropeSegmentMember 2024-01-01 2024-09-30 0001488139 amrc:OtherRevenueMember us-gaap:AllOtherSegmentsMember 2024-01-01 2024-09-30 0001488139 amrc:OtherRevenueMember 2024-01-01 2024-09-30 0001488139 amrc:NorthAmericaRegionsMember 2024-01-01 2024-09-30 0001488139 amrc:USFederalMember 2024-01-01 2024-09-30 0001488139 amrc:RenewableFuelsMember 2024-01-01 2024-09-30 0001488139 amrc:EuropeSegmentMember 2024-01-01 2024-09-30 0001488139 us-gaap:AllOtherSegmentsMember 2024-01-01 2024-09-30 0001488139 country:US 2025-07-01 2025-09-30 0001488139 country:US 2024-07-01 2024-09-30 0001488139 country:US 2025-01-01 2025-09-30 0001488139 country:US 2024-01-01 2024-09-30 0001488139 country:CA 2025-07-01 2025-09-30 0001488139 country:CA 2024-07-01 2024-09-30 0001488139 country:CA 2025-01-01 2025-09-30 0001488139 country:CA 2024-01-01 2024-09-30 0001488139 srt:EuropeMember 2025-07-01 2025-09-30 0001488139 srt:EuropeMember 2024-07-01 2024-09-30 0001488139 srt:EuropeMember 2025-01-01 2025-09-30 0001488139 srt:EuropeMember 2024-01-01 2024-09-30 0001488139 2025-10-01 2025-09-30 0001488139 amrc:ASAControlsIncMember 2025-01-01 2025-09-30 0001488139 amrc:ASAControlsIncMember 2025-01-24 0001488139 amrc:NorthAmericaRegionsMember 2024-12-31 0001488139 amrc:USFederalMember 2024-12-31 0001488139 amrc:EuropeSegmentMember 2024-12-31 0001488139 us-gaap:AllOtherSegmentsMember 2024-12-31 0001488139 amrc:NorthAmericaRegionsMember 2025-09-30 0001488139 amrc:USFederalMember 2025-09-30 0001488139 amrc:EuropeSegmentMember 2025-09-30 0001488139 us-gaap:AllOtherSegmentsMember 2025-09-30 0001488139 us-gaap:CustomerContractsMember 2025-07-01 2025-09-30 0001488139 us-gaap:CustomerContractsMember 2024-07-01 2024-09-30 0001488139 us-gaap:CustomerContractsMember 2025-01-01 2025-09-30 0001488139 us-gaap:CustomerContractsMember 2024-01-01 2024-09-30 0001488139 us-gaap:OtherIntangibleAssetsMember 2025-07-01 2025-09-30 0001488139 us-gaap:OtherIntangibleAssetsMember 2024-07-01 2024-09-30 0001488139 us-gaap:OtherIntangibleAssetsMember 2025-01-01 2025-09-30 0001488139 us-gaap:OtherIntangibleAssetsMember 2024-01-01 2024-09-30 0001488139 amrc:RenewalEnergyProgramMember 2025-09-30 0001488139 amrc:RenewalEnergyProgramMember 2024-12-31 0001488139 amrc:AssetRetirementObligationAROAssetMember 2025-07-01 2025-09-30 0001488139 amrc:AssetRetirementObligationAROAssetMember 2024-07-01 2024-09-30 0001488139 amrc:AssetRetirementObligationAROAssetMember 2025-01-01 2025-09-30 0001488139 amrc:AssetRetirementObligationAROAssetMember 2024-01-01 2024-09-30 0001488139 amrc:UnitedStatesNavyMember 2025-09-30 0001488139 amrc:RevolvingSeniorSecuredCreditFacilityMember us-gaap:LineOfCreditMember 2025-09-30 0001488139 amrc:RevolvingSeniorSecuredCreditFacilityMember us-gaap:LineOfCreditMember 2024-12-31 0001488139 amrc:SeniorSecuredMember us-gaap:SecuredDebtMember 2025-09-30 0001488139 amrc:SeniorSecuredMember us-gaap:SecuredDebtMember 2024-12-31 0001488139 amrc:JuniorSecuredNotesDueJune2029SecondLienMember us-gaap:SecuredDebtMember 2025-09-30 0001488139 amrc:JuniorSecuredNotesDueJune2029SecondLienMember us-gaap:SecuredDebtMember 2024-12-31 0001488139 us-gaap:RevolvingCreditFacilityMember amrc:EnergyAssetConstructionFacilitiesMember us-gaap:LineOfCreditMember 2025-09-30 0001488139 us-gaap:RevolvingCreditFacilityMember amrc:EnergyAssetConstructionFacilitiesMember us-gaap:LineOfCreditMember 2024-12-31 0001488139 us-gaap:RevolvingCreditFacilityMember amrc:EnergyAssetOperatingFacilitiesMember us-gaap:LineOfCreditMember 2025-09-30 0001488139 us-gaap:RevolvingCreditFacilityMember amrc:EnergyAssetOperatingFacilitiesMember us-gaap:LineOfCreditMember 2024-12-31 0001488139 us-gaap:RevolvingCreditFacilityMember amrc:OtherFinancingFacilitiesMember amrc:FinancingFacilityMember 2025-09-30 0001488139 us-gaap:RevolvingCreditFacilityMember amrc:OtherFinancingFacilitiesMember amrc:FinancingFacilityMember 2024-12-31 0001488139 us-gaap:RevolvingCreditFacilityMember us-gaap:BaseRateMember amrc:SeniorSecuredMember srt:MinimumMember us-gaap:LineOfCreditMember 2025-01-23 2025-01-23 0001488139 us-gaap:RevolvingCreditFacilityMember us-gaap:BaseRateMember amrc:SeniorSecuredMember srt:MaximumMember us-gaap:LineOfCreditMember 2025-01-23 2025-01-23 0001488139 us-gaap:RevolvingCreditFacilityMember us-gaap:SecuredOvernightFinancingRateSofrMember amrc:SeniorSecuredMember srt:MinimumMember us-gaap:LineOfCreditMember 2025-01-23 2025-01-23 0001488139 us-gaap:RevolvingCreditFacilityMember us-gaap:SecuredOvernightFinancingRateSofrMember amrc:SeniorSecuredMember srt:MaximumMember us-gaap:LineOfCreditMember 2025-01-23 2025-01-23 0001488139 us-gaap:RevolvingCreditFacilityMember amrc:SeniorSecuredMember srt:MinimumMember us-gaap:LineOfCreditMember 2025-01-23 2025-01-23 0001488139 us-gaap:RevolvingCreditFacilityMember amrc:SeniorSecuredMember srt:MaximumMember us-gaap:LineOfCreditMember 2025-01-23 2025-01-23 0001488139 amrc:TermLoanAMember us-gaap:SecuredDebtMember 2025-09-30 0001488139 us-gaap:RevolvingCreditFacilityMember us-gaap:LineOfCreditMember 2025-09-30 0001488139 amrc:SeniorSecuredCreditFacilityMember us-gaap:SecuredDebtMember 2025-09-30 0001488139 us-gaap:RevolvingCreditFacilityMember us-gaap:LineOfCreditMember 2025-01-23 2025-01-23 0001488139 amrc:SeniorSecuredMember us-gaap:SecuredDebtMember 2025-01-23 2025-01-23 0001488139 us-gaap:RevolvingCreditFacilityMember amrc:TermLoanDueDecember282028Member us-gaap:SecuredDebtMember 2025-01-23 2025-01-23 0001488139 amrc:TermLoanMember amrc:TermLoanDueDecember282028Member us-gaap:SecuredDebtMember 2025-01-23 2025-01-23 0001488139 us-gaap:RevolvingCreditFacilityMember us-gaap:LineOfCreditMember 2025-01-23 0001488139 us-gaap:RevolvingCreditFacilityMember 2025-01-23 2025-01-23 0001488139 us-gaap:RevolvingCreditFacilityMember 2025-01-23 0001488139 us-gaap:RevolvingCreditFacilityMember amrc:DebtCovenantPeriodFiveMember amrc:SeniorSecuredCreditFacilityMember us-gaap:LineOfCreditMember 2025-01-23 0001488139 amrc:SeniorSecuredNotesDueSeptember2045Member us-gaap:SeniorNotesMember 2025-04-30 0001488139 amrc:SeniorSecuredNotesDueSeptember2045Member us-gaap:SeniorNotesMember 2025-04-30 2025-06-27 0001488139 amrc:SeniorSecuredNotesDueSeptember2045Member us-gaap:SeniorNotesMember 2025-04-30 2025-04-30 0001488139 amrc:SeniorSecuredNotesDueSeptember2045Member us-gaap:SeniorNotesMember 2025-06-27 2025-06-27 0001488139 amrc:MakeWholeProvisionApril2045Member us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-04-30 0001488139 amrc:SeniorSecuredNotesDueSeptember2045Member us-gaap:SeniorNotesMember 2025-01-01 2025-09-30 0001488139 us-gaap:LineOfCreditMember amrc:TermLoanDueDecember2037Member us-gaap:LineOfCreditMember 2025-05-27 0001488139 us-gaap:LineOfCreditMember amrc:TermLoanDueDecember2037Member us-gaap:LineOfCreditMember 2025-05-27 2025-05-27 0001488139 amrc:MakeWholeProvisionsDecember2037Member us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-05-27 0001488139 us-gaap:LineOfCreditMember amrc:TermLoanDueJune2025Member us-gaap:LineOfCreditMember 2025-05-27 0001488139 amrc:TermLoanDueJune2025Member us-gaap:LineOfCreditMember 2025-05-27 2025-05-27 0001488139 amrc:TermLoanDueDecember2037Member us-gaap:LineOfCreditMember 2025-05-27 2025-05-27 0001488139 amrc:FinancingFacilityMember amrc:FixedRateNoteDueSeptember2040Member 2025-05-27 0001488139 amrc:FinancingFacilityMember amrc:FixedRateNoteDueSeptember2040Member us-gaap:LineOfCreditMember 2025-01-01 2025-09-30 0001488139 amrc:FinancingFacilityMember amrc:FixedRateNoteDueSeptember2040Member us-gaap:LineOfCreditMember 2025-09-26 2025-09-26 0001488139 us-gaap:RevolvingCreditFacilityMember amrc:FixedRateNoteDueAugust2039Member us-gaap:LineOfCreditMember 2023-09-28 0001488139 amrc:FinancingFacilityMember amrc:FixedRateNoteDueSeptember2040Member us-gaap:LineOfCreditMember 2025-09-30 0001488139 us-gaap:RevolvingCreditFacilityMember amrc:ConstructionCreditFacilityDueDecember2027Member us-gaap:LineOfCreditMember 2025-09-30 0001488139 us-gaap:RevolvingCreditFacilityMember amrc:ConstructionCreditFacilityDueDecember2027Member us-gaap:LineOfCreditMember 2025-01-01 2025-09-30 0001488139 us-gaap:RevolvingCreditFacilityMember amrc:ConstructionCreditFacilityDueMarch2026Member us-gaap:LineOfCreditMember 2025-09-30 0001488139 amrc:SeniorSecuredFirstLienTermNotes5.71DueDecember2043Member us-gaap:SeniorNotesMember us-gaap:SubsequentEventMember 2025-10-31 0001488139 amrc:SecondLienTermNotes7.4DueSeptember2040Member us-gaap:SeniorNotesMember us-gaap:SubsequentEventMember 2025-10-31 0001488139 amrc:SeniorSecuredFirstLienTermNotes5.71DueDecember2043Member us-gaap:SeniorNotesMember us-gaap:SubsequentEventMember 2025-10-31 2025-10-31 0001488139 amrc:SecondLienTermNotes7.4DueSeptember2040Member us-gaap:SeniorNotesMember us-gaap:SubsequentEventMember 2025-10-31 2025-10-31 0001488139 amrc:SeniorSecuredFirstLienTermNotes5.71DueDecember2043AndSecondLienTermNotes7.40DueSeptember2040DueSeptember2030Member us-gaap:SeniorNotesMember us-gaap:SubsequentEventMember 2025-10-31 0001488139 amrc:SeniorSecuredFirstLienTermNotes5.71DueDecember2043AndSecondLienTermNotes7.40DueSeptember2040DueSeptember2030Member us-gaap:SeniorNotesMember us-gaap:SubsequentEventMember 2025-10-31 2025-10-31 0001488139 amrc:August2018LongTermFinanceLiabilityMember amrc:SolarPhotovoltaicProjectsMember 2025-01-01 2025-09-30 0001488139 2021-10-31 0001488139 2024-08-30 0001488139 2024-09-05 2024-09-05 0001488139 amrc:PlugSmartMember 2021-12-01 2021-12-31 0001488139 amrc:PlugSmartMember 2021-12-31 0001488139 amrc:PlugSmartMember 2024-12-31 0001488139 amrc:PlugSmartMember 2025-01-01 2025-09-30 0001488139 amrc:PlugSmartMember 2025-09-30 0001488139 srt:MinimumMember amrc:LossOfDepositsFromPowinBankruptcyMember 2025-06-10 0001488139 srt:MaximumMember amrc:LossOfDepositsFromPowinBankruptcyMember 2025-06-10 0001488139 us-gaap:InterestRateSwapMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel2Member 2025-09-30 0001488139 us-gaap:InterestRateSwapMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel2Member 2024-12-31 0001488139 us-gaap:HybridInstrumentMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel2Member 2025-09-30 0001488139 us-gaap:HybridInstrumentMember us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel2Member 2024-12-31 0001488139 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member 2025-09-30 0001488139 us-gaap:FairValueMeasurementsRecurringMember us-gaap:FairValueInputsLevel3Member 2024-12-31 0001488139 us-gaap:FairValueMeasurementsRecurringMember 2025-09-30 0001488139 us-gaap:FairValueMeasurementsRecurringMember 2024-12-31 0001488139 2024-01-01 2024-12-31 0001488139 us-gaap:EstimateOfFairValueFairValueDisclosureMember 2025-09-30 0001488139 us-gaap:CarryingReportedAmountFairValueDisclosureMember 2025-09-30 0001488139 us-gaap:EstimateOfFairValueFairValueDisclosureMember 2024-12-31 0001488139 us-gaap:CarryingReportedAmountFairValueDisclosureMember 2024-12-31 0001488139 us-gaap:FairValueMeasurementsNonrecurringMember 2024-12-31 0001488139 us-gaap:FairValueMeasurementsNonrecurringMember 2025-09-30 0001488139 us-gaap:InterestRateSwapMember us-gaap:OtherAssetsMember us-gaap:DesignatedAsHedgingInstrumentMember 2025-09-30 0001488139 us-gaap:InterestRateSwapMember us-gaap:OtherAssetsMember us-gaap:DesignatedAsHedgingInstrumentMember 2024-12-31 0001488139 us-gaap:InterestRateSwapMember us-gaap:OtherAssetsMember us-gaap:NondesignatedMember 2025-09-30 0001488139 us-gaap:InterestRateSwapMember us-gaap:OtherAssetsMember us-gaap:NondesignatedMember 2024-12-31 0001488139 us-gaap:InterestRateSwapMember us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 us-gaap:InterestRateSwapMember us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2024-12-31 0001488139 us-gaap:HybridInstrumentMember us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 us-gaap:HybridInstrumentMember us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2024-12-31 0001488139 us-gaap:InterestRateSwapMember us-gaap:NondesignatedMember 2025-01-01 2025-09-30 0001488139 us-gaap:InterestRateSwapMember us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:NonoperatingIncomeExpenseMember 2025-07-01 2025-09-30 0001488139 us-gaap:InterestRateSwapMember us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:NonoperatingIncomeExpenseMember 2024-07-01 2024-09-30 0001488139 us-gaap:InterestRateSwapMember us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:NonoperatingIncomeExpenseMember 2025-01-01 2025-09-30 0001488139 us-gaap:InterestRateSwapMember us-gaap:DesignatedAsHedgingInstrumentMember us-gaap:NonoperatingIncomeExpenseMember 2024-01-01 2024-09-30 0001488139 us-gaap:InterestRateSwapMember us-gaap:NondesignatedMember us-gaap:NonoperatingIncomeExpenseMember 2025-07-01 2025-09-30 0001488139 us-gaap:InterestRateSwapMember us-gaap:NondesignatedMember us-gaap:NonoperatingIncomeExpenseMember 2024-07-01 2024-09-30 0001488139 us-gaap:InterestRateSwapMember us-gaap:NondesignatedMember us-gaap:NonoperatingIncomeExpenseMember 2025-01-01 2025-09-30 0001488139 us-gaap:InterestRateSwapMember us-gaap:NondesignatedMember us-gaap:NonoperatingIncomeExpenseMember 2024-01-01 2024-09-30 0001488139 us-gaap:HybridInstrumentMember us-gaap:NondesignatedMember us-gaap:NonoperatingIncomeExpenseMember 2025-07-01 2025-09-30 0001488139 us-gaap:HybridInstrumentMember us-gaap:NondesignatedMember us-gaap:NonoperatingIncomeExpenseMember 2024-07-01 2024-09-30 0001488139 us-gaap:HybridInstrumentMember us-gaap:NondesignatedMember us-gaap:NonoperatingIncomeExpenseMember 2025-01-01 2025-09-30 0001488139 us-gaap:HybridInstrumentMember us-gaap:NondesignatedMember us-gaap:NonoperatingIncomeExpenseMember 2024-01-01 2024-09-30 0001488139 us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember 2024-12-31 0001488139 us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember 2025-01-01 2025-09-30 0001488139 us-gaap:AccumulatedGainLossNetCashFlowHedgeParentMember 2025-09-30 0001488139 amrc:InterestRateSwapOctober2029Member us-gaap:DesignatedAsHedgingInstrumentMember 2025-01-01 2025-09-30 0001488139 amrc:InterestRateSwapOctober2029Member us-gaap:DesignatedAsHedgingInstrumentMember 2025-09-30 0001488139 amrc:InterestRateSwapJune2033Member us-gaap:DesignatedAsHedgingInstrumentMember 2025-01-01 2025-09-30 0001488139 amrc:InterestRateSwapJune2033Member us-gaap:DesignatedAsHedgingInstrumentMember 2025-09-30 0001488139 amrc:InterestRateSwapDecember2027Member us-gaap:DesignatedAsHedgingInstrumentMember 2025-01-01 2025-09-30 0001488139 amrc:InterestRateSwapDecember2027Member us-gaap:DesignatedAsHedgingInstrumentMember 2025-09-30 0001488139 amrc:InterestRateSwapDecember2040Member us-gaap:DesignatedAsHedgingInstrumentMember 2025-01-01 2025-09-30 0001488139 amrc:InterestRateSwapDecember2040Member us-gaap:DesignatedAsHedgingInstrumentMember 2025-09-30 0001488139 amrc:InterestRateSwapJuly2041Member us-gaap:NondesignatedMember 2025-01-01 2025-09-30 0001488139 amrc:InterestRateSwapJuly2041Member us-gaap:NondesignatedMember 2025-09-30 0001488139 amrc:MakeWholeProvisionDecember2038Member us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 amrc:MakeWholeProvisionApril2031Member us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 amrc:MakeWholeProvisionFebruary2034Member us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 amrc:MakeWholeProvisionDecember2027Member us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 amrc:MakeWholeProvisionMay2028Member us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 amrc:MakeWholeProvisionApril2045Member us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 amrc:MakeWholeProvisionsDecember2047Member us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 amrc:MakeWholeProvisionMarch2042Member us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 amrc:MakeWholeProvisionsMarch2046Member us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 amrc:MakeWholeProvisionJune2042OneMember us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 amrc:MakeWholeProvisionJune2042TwoMember us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 amrc:MakeWholeProvisionsSeptember2045Member us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 amrc:MakeWholeProvisionsDecember2037Member us-gaap:OtherLiabilitiesMember us-gaap:NondesignatedMember 2025-09-30 0001488139 amrc:InvestmentFundsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2025-09-30 0001488139 amrc:OtherVIEsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2025-09-30 0001488139 amrc:InvestmentFundsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2024-12-31 0001488139 amrc:OtherVIEsMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2024-12-31 0001488139 us-gaap:CorporateJointVentureMember 2024-02-09 0001488139 us-gaap:CorporateJointVentureMember 2024-02-09 2024-02-09 0001488139 us-gaap:CorporateJointVentureMember 2024-12-31 0001488139 us-gaap:CorporateJointVentureMember 2025-09-30 0001488139 us-gaap:EmployeeStockOptionMember 2025-09-30 0001488139 us-gaap:EmployeeStockOptionMember 2025-01-01 2025-09-30 0001488139 amrc:PerformanceShareOptionsMember 2025-09-30 0001488139 amrc:StockIncentive2020PlanMember 2025-01-01 2025-09-30 0001488139 amrc:StockIncentive2020PlanMember us-gaap:EmployeeStockOptionMember 2025-01-01 2025-09-30 0001488139 us-gaap:EmployeeStockOptionMember srt:MinimumMember amrc:StockIncentive2020PlanMember 2025-01-01 2025-09-30 0001488139 us-gaap:EmployeeStockOptionMember srt:MaximumMember amrc:StockIncentive2020PlanMember 2025-01-01 2025-09-30 0001488139 amrc:StockIncentive2020PlanMember us-gaap:RestrictedStockUnitsRSUMember 2025-01-01 2025-09-30 0001488139 us-gaap:RestrictedStockUnitsRSUMember amrc:StockIncentive2020PlanMember srt:DirectorMember 2025-01-01 2025-09-30 0001488139 us-gaap:RestrictedStockUnitsRSUMember amrc:ShareBasedPaymentArrangementTrancheFourMember amrc:StockIncentive2020PlanMember amrc:EmployeeMember 2025-01-01 2025-09-30 0001488139 us-gaap:RestrictedStockUnitsRSUMember us-gaap:ShareBasedCompensationAwardTrancheThreeMember amrc:StockIncentive2020PlanMember amrc:EmployeeMember 2025-01-01 2025-09-30 0001488139 us-gaap:RestrictedStockUnitsRSUMember us-gaap:ShareBasedCompensationAwardTrancheOneMember amrc:StockIncentive2020PlanMember amrc:EmployeeMember 2025-01-01 2025-09-30 0001488139 us-gaap:RestrictedStockUnitsRSUMember us-gaap:ShareBasedCompensationAwardTrancheTwoMember amrc:StockIncentive2020PlanMember amrc:EmployeeMember 2025-01-01 2025-09-30 0001488139 us-gaap:RestrictedStockUnitsRSUMember amrc:StockIncentive2020PlanMember amrc:EmployeeMember 2025-01-01 2025-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:NorthAmericaRegionsMember 2025-07-01 2025-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:USFederalMember 2025-07-01 2025-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:RenewableFuelsMember 2025-07-01 2025-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:EuropeSegmentMember 2025-07-01 2025-09-30 0001488139 us-gaap:OperatingSegmentsMember us-gaap:AllOtherSegmentsMember 2025-07-01 2025-09-30 0001488139 us-gaap:CorporateNonSegmentMember 2025-07-01 2025-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:NorthAmericaRegionsMember 2024-07-01 2024-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:USFederalMember 2024-07-01 2024-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:RenewableFuelsMember 2024-07-01 2024-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:EuropeSegmentMember 2024-07-01 2024-09-30 0001488139 us-gaap:OperatingSegmentsMember us-gaap:AllOtherSegmentsMember 2024-07-01 2024-09-30 0001488139 us-gaap:CorporateNonSegmentMember 2024-07-01 2024-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:NorthAmericaRegionsMember 2025-01-01 2025-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:USFederalMember 2025-01-01 2025-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:RenewableFuelsMember 2025-01-01 2025-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:EuropeSegmentMember 2025-01-01 2025-09-30 0001488139 us-gaap:OperatingSegmentsMember us-gaap:AllOtherSegmentsMember 2025-01-01 2025-09-30 0001488139 us-gaap:CorporateNonSegmentMember 2025-01-01 2025-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:NorthAmericaRegionsMember 2024-01-01 2024-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:USFederalMember 2024-01-01 2024-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:RenewableFuelsMember 2024-01-01 2024-09-30 0001488139 us-gaap:OperatingSegmentsMember amrc:EuropeSegmentMember 2024-01-01 2024-09-30 0001488139 us-gaap:OperatingSegmentsMember us-gaap:AllOtherSegmentsMember 2024-01-01 2024-09-30 0001488139 us-gaap:CorporateNonSegmentMember 2024-01-01 2024-09-30 0001488139 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember amrc:TwoEnergyAssetProjectsMember 2025-01-01 2025-09-30 0001488139 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember amrc:TwoEnergyAssetProjectsMember 2025-09-30 0001488139 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember amrc:ThreeEnergyAssetProjectsMember 2024-01-01 2024-12-31 0001488139 us-gaap:DisposalGroupHeldforsaleNotDiscontinuedOperationsMember amrc:ThreeEnergyAssetProjectsMember 2024-12-31 0001488139 amrc:NickolasStavropoulosMember 2025-07-01 2025-09-30 0001488139 amrc:NickolasStavropoulosMember 2025-09-30 0001488139 amrc:LouisPMaltezosMember 2025-07-01 2025-09-30

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 10-Q
(Mark One)

☑ |  | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2025
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: 001-34811
Ameresco, Inc.
(Exact name of registrant as specified in its charter)

Delaware |  | 04-3512838
(State or Other Jurisdiction of Incorporation or Organization) |  | (I.R.S. Employer Identification No.)
111 Speen Street, Suite 410 Framingham, Massachusetts |  | 01701
(Address of Principal Executive Offices) |  | (Zip Code)

(508) 661-2200
(Registrant’s Telephone Number, Including Area Code)
N/A
(Former name, former address and former fiscal year, if changed since last report)
Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class | Trading Symbol | Name of exchange on which registered
Class A Common Stock, par value $0.0001 per share | AMRC | New York Stock Exchange

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 ☑ 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 and post such files). Yes ☑ 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 o | Non-accelerated filer o | 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. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☑
Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Class | Shares outstanding as of October 30, 2025
Class A Common Stock, $0.0001 par value per share | 34,797,456
Class B Common Stock, $0.0001 par value per share | 18,000,000

TABLE OF CONTENTS

|  | Page
PART I - FINANCIAL INFORMATION |
Item 1. Condensed Consolidated Financial Statements |
Condensed Consolidated Balance Sheets at September 30, 2025 (Unaudited) and December 31, 2024 | 1
Condensed Consolidated Statements of Income for the three and nine months ended September 30, 2025 and 2024 (Unaudited) | 3
Condensed Consolidated Statements of Comprehensive Income for the three and nine months ended September, 30 2025 and 2024 (Unaudited) | 4
Condensed Consolidated Statements of Changes in Redeemable Non-Controlling Interests and Stockholders’ Equity for the three and nine months ended September 30, 2025 and 2024 (Unaudited) | 5
Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 2025 and 2024 (Unaudited) | 7
Notes to Condensed Consolidated Financial Statements (Unaudited) | 9
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations | 31
Item 3. Quantitative and Qualitative Disclosures About Market Risk | 41
Item 4. Controls and Procedures | 41
PART II - OTHER INFORMATION |
Item 1. Legal Proceedings | 43
Item 1A. Risk Factors | 43
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds | 43
Item 5. Other Information | 43
Item 6. Exhibits | 45
Signatures |  | 46

Table of Contents
Part I - Financial Information
Item 1. Condensed Consolidated Financial Statements
AMERESCO, INC.
CONDENSED CONSOLIDATED BALANCE SHEETS
(In thousands, except share and per share amounts)

| September 30, 2025 |  | December 31, 2024
| (Unaudited) |  |
ASSETS |  |
Current assets: |  |  |
Cash and cash equivalents (1) | $ | 94,551 |  |  | $ | 108,516 |
Restricted cash (1) | 98,504 |  |  | 69,706 |
Accounts receivable, net of allowance of $1,022 and $845, respectively (1) | 253,793 |  |  | 256,961 |
Accounts receivable retainage, net | 48,846 |  |  | 39,843 |
Unbilled revenue (1) | 691,316 |  |  | 644,105 |
Inventory, net | 12,785 |  |  | 11,556 |
Prepaid expenses and other current assets (1) | 189,747 |  |  | 145,906 |
Income taxes receivable | 3,603 |  |  | 1,685 |
Project development costs, net | 27,351 |  |  | 22,856 |
Total current assets (1) | 1,420,496 |  |  | 1,301,134 |
Federal ESPC receivable | 516,326 |  |  | 609,128 |
Property and equipment, net (1) | 9,848 |  |  | 11,040 |
Energy assets, net (1) | 2,117,460 |  |  | 1,915,311 |
Deferred income tax assets, net | 76,348 |  |  | 56,523 |
Goodwill, net | 69,245 |  |  | 66,305 |
Intangible assets, net | 8,109 |  |  | 8,814 |
Right-of-use assets, net (1) | 76,371 |  |  | 80,149 |
Restricted cash, non-current portion (1) | 22,541 |  |  | 20,156 |
Other assets (1) | 109,666 |  |  | 89,948 |
Total assets (1) | $ | 4,426,410 |  |  | $ | 4,158,508 |
LIABILITIES, REDEEMABLE NON-CONTROLLING INTERESTS, AND STOCKHOLDERS’ EQUITY
Current liabilities: |  |  |
Current portions of long-term debt and financing lease liabilities, net (1) | $ | 167,083 |  |  | $ | 149,363 |
Accounts payable (1) | 569,600 |  |  | 529,338 |
Accrued expenses and other current liabilities (1) | 105,829 |  |  | 107,293 |
Current portions of operating lease liabilities (1) | 8,062 |  |  | 10,536 |
Deferred revenue | 87,297 |  |  | 91,734 |
Income taxes payable | 1,428 |  |  | 744 |
Total current liabilities (1) | 939,299 |  |  | 889,008 |
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs (1) | 1,716,689 |  |  | 1,483,900 |
Federal ESPC liabilities | 499,074 |  |  | 555,396 |
Deferred income tax liabilities, net | 2,771 |  |  | 2,223 |
Deferred grant income | 5,479 |  |  | 6,436 |
Long-term operating lease liabilities, net of current portion (1) | 56,032 |  |  | 59,479 |
Other liabilities (1) | 111,624 |  |  | 114,454 |
Commitments and contingencies (Note 10) |  |  |
Redeemable non-controlling interests, net | 1,556 |  |  | 2,463 |

(1) Includes restricted assets of consolidated variable interest entities (“VIEs”) at September 30, 2025 and December 31, 2024 of $285,449 and $158,548, respectively. Includes liabilities of consolidated VIEs at September 30, 2025 and December 31, 2024 of $146,082 and $16,871, respectively. See Note 13.
1

Table of Contents
AMERESCO, INC.
CONDENSED CONSOLIDATED BALANCE SHEETS
(In thousands, except share and per share amounts) (Continued)

| September 30, 2025 |  | December 31, 2024
| (Unaudited) |  |
Stockholders’ equity: |  |  |
Preferred stock, $0.0001 par value, 5,000,000 shares authorized, no shares issued and outstanding at September 30, 2025 and December 31, 2024 | $ | — |  |  | $ | — |
Class A common stock, $0.0001 par value, 500,000,000 shares authorized, 36,854,190 shares issued and 34,752,355 shares outstanding at September 30, 2025, 36,603,048 shares issued and 34,501,213 shares outstanding at December 31, 2024 | 3 |  |  | 3 |
Class B common stock, $0.0001 par value, 144,000,000 shares authorized, 18,000,000 shares issued and outstanding at September 30, 2025 and December 31, 2024 | 2 |  |  | 2 |
Additional paid-in capital | 390,119 |  |  | 378,321 |
Retained earnings | 678,393 |  |  | 652,561 |
Accumulated other comprehensive loss, net | (1,067) |  |  | (5,874) |
Treasury stock, at cost, 2,101,835 shares at September 30, 2025 and December 31, 2024 | (11,788) |  |  | (11,788) |
Stockholders’ equity before non-controlling interest | 1,055,662 |  |  | 1,013,225 |
Non-controlling interests | 38,224 |  |  | 31,924 |
Total stockholders’ equity | 1,093,886 |  |  | 1,045,149 |
Total liabilities, redeemable non-controlling interests, and stockholders’ equity | $ | 4,426,410 |  |  | $ | 4,158,508 |

See notes to condensed consolidated financial statements.
2

Table of Contents
AMERESCO, INC.
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
(In thousands, except per share amounts) (Unaudited)

| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Revenues | $ | 525,987 |  |  | $ | 500,873 |  |  | $ | 1,351,100 |  |  | $ | 1,237,261 |
Cost of revenues | 441,658 |  |  | 423,734 |  |  | 1,141,494 |  |  | 1,047,960 |
Gross profit | 84,329 |  |  | 77,139 |  |  | 209,606 |  |  | 189,301 |
Earnings from unconsolidated entities | 1,393 |  |  | 159 |  |  | 1,804 |  |  | 724 |
Selling, general and administrative expenses | 43,372 |  |  | 42,139 |  |  | 127,593 |  |  | 125,920 |
Operating income | 42,350 |  |  | 35,159 |  |  | 83,817 |  |  | 64,105 |
Interest expense and interest income, net | 20,485 |  |  | 18,416 |  |  | 58,828 |  |  | 47,460 |
Other expenses (income), net | 3,703 |  |  | 3,053 |  |  | (1,374) |  |  | 3,939 |
Income before income taxes | 18,162 |  |  | 13,690 |  |  | 26,363 |  |  | 12,706 |
Income tax benefit | (3,678) |  |  | (3,324) |  |  | (5,390) |  |  | (3,324) |
Net income | 21,840 |  |  | 17,014 |  |  | 31,753 |  |  | 16,030 |
Net (income) loss attributable to non-controlling interests and redeemable non-controlling interests | (3,308) |  |  | 585 |  |  | (5,839) |  |  | 3,642 |
Net income attributable to common shareholders | $ | 18,532 |  |  | 17,599 |  |  | $ | 25,914 |  |  | $ | 19,672 |
Net income per share attributable to common shareholders: |  |  |  |  |  |  |
Basic | $ | 0.35 |  |  | $ | 0.34 |  |  | $ | 0.49 |  |  | $ | 0.37 |
Diluted | $ | 0.35 |  |  | $ | 0.33 |  |  | $ | 0.49 |  |  | $ | 0.37 |
Weighted average common shares outstanding: |  |  |  |  |  |  |
Basic | 52,716 |  |  | 52,413 |  |  | 52,633 |  |  | 52,352 |
Diluted | 53,370 |  |  | 53,243 |  |  | 53,095 |  |  | 53,098 |

See notes to condensed consolidated financial statements.
3

Table of Contents
AMERESCO, INC.
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
(In thousands) (Unaudited)

| Three Months Ended September 30,
| 2025 |  | 2024
Net income | $ | 21,840 |  |  | $ | 17,014 |
Other comprehensive (loss) income: |  |  |
Unrealized loss from interest rate hedges, net of tax | (65) |  |  | (1,060) |
Foreign currency translation adjustments | (1,085) |  |  | 2,003 |
Total other comprehensive (loss) income | (1,150) |  |  | 943 |
Comprehensive income | 20,690 |  |  | 17,957 |
Comprehensive income attributable to non-controlling interests and redeemable non-controlling interests: |  |  |
Net (income) loss | (3,308) |  |  | 585 |
Foreign currency translation adjustments | (157) |  |  | 54 |
Comprehensive (income) loss attributable to non-controlling interests and redeemable non-controlling interests | (3,465) |  |  | 639 |
Comprehensive income attributable to common shareholders | $ | 17,225 |  |  | $ | 18,596 |
| Nine Months Ended September 30,
| 2025 |  | 2024
Net income | $ | 31,753 |  |  | $ | 16,030 |
Other comprehensive (loss) income: |  |  |
Unrealized loss from interest rate hedges, net of tax | (695) |  |  | (446) |
Foreign currency translation adjustments | 5,594 |  |  | 652 |
Total other comprehensive income | 4,899 |  |  | 206 |
Comprehensive income | 36,652 |  |  | 16,236 |
Comprehensive (income) loss attributable to non-controlling interests and redeemable non-controlling interests: |  |  |
Net (income) loss | (5,839) |  |  | 3,642 |
Foreign currency translation adjustments | (92) |  |  | 36 |
Comprehensive (income) loss attributable to non-controlling interests and redeemable non-controlling interests | (5,931) |  |  | 3,678 |
Comprehensive income attributable to common shareholders | $ | 30,721 |  |  | $ | 19,914 |

See notes to condensed consolidated financial statements.
4

Table of Contents
AMERESCO, INC.
CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE NON-CONTROLLING INTERESTS AND STOCKHOLDERS’ EQUITY
For the Three Months Ended September 30, 2025 and 2024
(In thousands, except share amounts) (Unaudited)

| Redeemable Non-controlling Interests (“RNCI”) |  | Class A Common Stock |  | Class B Common Stock |  | Additional Paid-in Capital |  | Retained Earnings |  | Accumulated Other Comprehensive (Loss) Income |  | Treasury Stock |  | Non-controlling Interests (“NCI”) |  | Total Stockholders’ Equity
|  | Shares |  | Amount |  | Shares |  | Amount |  |  |  |  | Shares |  | Amount |  |
Balance, June 30, 2024 | $ | 43,777 |  |  | 34,402,515 |  |  | $ | 3 |  |  | 18,000,000 |  |  | $ | 2 |  |  | $ | 332,356 |  |  | $ | 597,930 |  |  | $ | (3,800) |  |  | 2,101,795 |  |  | $ | (11,788) |  |  | $ | 26,489 |  |  | $ | 941,192 |
Exercise of stock options | — |  |  | 7,500 |  |  | — |  |  | — |  |  | — |  |  | 405 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 405 |
Stock-based compensation expense | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 3,664 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 3,664 |
Restricted stock units released | — |  |  | 32,736 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 40 |  |  | — |  |  | — |  |  | — |
Unrealized loss from interest rate hedges, net | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,060) |  |  | — |  |  | — |  |  | — |  |  | (1,060) |
Foreign currency translation adjustment | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,057 |  |  | — |  |  | — |  |  | (54) |  |  | 2,003 |
Distributions to RNCI | (130) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Accretion of tax equity financing fees | 26 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (26) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (26) |
Contributions from NCI | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,997 |  |  | 2,997 |
Distributions to NCI | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (364) |  |  | (364) |
Net (loss) income | (912) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 17,599 |  |  | — |  |  | — |  |  | — |  |  | 327 |  |  | 17,926 |
Balance, September 30, 2024 | $ | 42,761 |  |  | 34,442,751 |  |  | $ | 3 |  |  | 18,000,000 |  |  | $ | 2 |  |  | $ | 336,425 |  |  | $ | 615,503 |  |  | $ | (2,803) |  |  | 2,101,835 |  |  | $ | (11,788) |  |  | $ | 29,395 |  |  | $ | 966,737 |
Balance, June 30, 2025 | $ | 1,543 |  |  | 34,703,659 |  |  | $ | 3 |  |  | 18,000,000 |  |  | $ | 2 |  |  | $ | 386,214 |  |  | $ | 659,888 |  |  | $ | 240 |  |  | 2,101,835 |  |  | $ | (11,788) |  |  | $ | 36,312 |  |  | $ | 1,070,871 |
Exercise of stock options | — |  |  | 9,000 |  |  | — |  |  | — |  |  | — |  |  | 159 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 159 |
Stock-based compensation expense | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 3,746 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 3,746 |
Restricted stock units released | — |  |  | 39,696 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Unrealized loss from interest rate hedges, net | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (65) |  |  | — |  |  | — |  |  | — |  |  | (65) |
Foreign currency translation adjustment | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,242) |  |  | — |  |  | — |  |  | 157 |  |  | (1,085) |
Accretion of tax equity financing fees | 27 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (27) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (27) |
Contributions from NCI | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 924 |  |  | 924 |
Distributions to NCI | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (2,491) |  |  | (2,491) |
Net (loss) income | (14) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 18,532 |  |  | — |  |  | — |  |  | — |  |  | 3,322 |  |  | 21,854 |
Balance, September 30, 2025 | $ | 1,556 |  |  | 34,752,355 |  |  | $ | 3 |  |  | 18,000,000 |  |  | $ | 2 |  |  | $ | 390,119 |  |  | $ | 678,393 |  |  | $ | (1,067) |  |  | 2,101,835 |  |  | $ | (11,788) |  |  | $ | 38,224 |  |  | $ | 1,093,886 |

See notes to condensed consolidated financial statements.
5

Table of Contents
AMERESCO, INC.
CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE NON-CONTROLLING INTERESTS AND STOCKHOLDERS’ EQUITY
For the Nine Months Ended September 30, 2025 and 2024
(In thousands, except share amounts) (Unaudited)

| Redeemable Non-controlling Interests |  | Class A Common Stock |  | Class B Common Stock |  | Additional Paid-in Capital |  | Retained Earnings |  | Accumulated Other Comprehensive (Loss) Income |  | Treasury Stock |  | Non-controlling Interests |  | Total Stockholders’ Equity
|  | Shares |  | Amount |  | Shares |  | Amount |  |  |  |  | Shares |  | Amount |  |
Balance, December 31, 2023 | $ | 46,865 |  |  | 34,277,195 |  |  | $ | 3 |  |  | 18,000,000 |  |  | $ | 2 |  |  | $ | 320,892 |  |  | $ | 595,911 |  |  | $ | (3,045) |  |  | 2,101,795 |  |  | $ | (11,788) |  |  | $ | 23,911 |  |  | $ | 925,886 |
Exercise of stock options | — |  |  | 70,089 |  |  | — |  |  | — |  |  | — |  |  | 909 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 909 |
Stock-based compensation expense | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 10,368 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 10,368 |
Employee stock purchase plan | — |  |  | 32,841 |  |  | — |  |  | — |  |  | — |  |  | 990 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 990 |
Restricted stock units released | — |  |  | 62,626 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 40 |  |  | — |  |  | — |  |  | — |
Unrealized loss from interest rate hedges, net | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (446) |  |  | — |  |  | — |  |  | — |  |  | (446) |
Foreign currency translation adjustment | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 688 |  |  |  |  | — |  |  | (36) |  |  | 652 |
Distributions to RNCI | (418) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Accretion of tax equity financing fees | 80 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (80) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (80) |
Contributions from NCI | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 3,040 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 30,749 |  |  | 33,789 |
Distributions to NCI | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,367) |  |  | (1,367) |
Purchase of shares from NCI | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 226 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (23,986) |  |  | (23,760) |
Net (loss) income | (3,766) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 19,672 |  |  | — |  |  | — |  |  | — |  |  | 124 |  |  | 19,796 |
Balance, September 30, 2024 | $ | 42,761 |  |  | 34,442,751 |  |  | $ | 3 |  |  | 18,000,000 |  |  | $ | 2 |  |  | $ | 336,425 |  |  | $ | 615,503 |  |  | $ | (2,803) |  |  | 2,101,835 |  |  | $ | (11,788) |  |  | $ | 29,395 |  |  | $ | 966,737 |
Balance, December 31, 2024 | $ | 2,463 |  |  | 34,501,213 |  |  | $ | 3 |  |  | 18,000,000 |  |  | $ | 2 |  |  | $ | 378,321 |  |  | $ | 652,561 |  |  | $ | (5,874) |  |  | 2,101,835 |  |  | $ | (11,788) |  |  | $ | 31,924 |  |  | $ | 1,045,149 |
Exercise of stock options | — |  |  | 89,178 |  |  | — |  |  | — |  |  | — |  |  | 662 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 662 |
Stock-based compensation expense | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 10,341 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 10,341 |
Employee stock purchase plan | — |  |  | 60,762 |  |  | — |  |  | — |  |  | — |  |  | 795 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 795 |
Restricted stock units released | — |  |  | 101,202 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Unrealized loss from interest rate hedges, net | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (695) |  |  | — |  |  | — |  |  | — |  |  | (695) |
Foreign currency translation adjustment | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 5,502 |  |  | — |  |  | — |  |  | 92 |  |  | 5,594 |
Accretion of tax equity financing fees | 82 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (82) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (82) |
Contributions from NCI | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4,723 |  |  | 4,723 |
Distributions to NCI | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (5,343) |  |  | (5,343) |
Net (loss) income | (989) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 25,914 |  |  | — |  |  | — |  |  | — |  |  | 6,828 |  |  | 32,742 |
Balance, September 30, 2025 | $ | 1,556 |  |  | 34,752,355 |  |  | $ | 3 |  |  | 18,000,000 |  |  | $ | 2 |  |  | $ | 390,119 |  |  | $ | 678,393 |  |  | $ | (1,067) |  |  | 2,101,835 |  |  | $ | (11,788) |  |  | $ | 38,224 |  |  | $ | 1,093,886 |

See notes to condensed consolidated financial statements.
6

Table of Contents
AMERESCO, INC.
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands) (Unaudited)

| Nine Months Ended September 30,
| 2025 |  | 2024
Cash flows from operating activities: |  |  |
Net income | $ | 31,753 |  |  | $ | 16,030 |
Adjustments to reconcile net income to net cash flows from operating activities: |  |  |
Depreciation of energy assets, net | 72,925 |  |  | 57,352 |
Depreciation of property and equipment | 1,695 |  |  | 3,699 |
Increase in contingent consideration | 71 |  |  | 87 |
Accretion of ARO liabilities | 324 |  |  | 243 |
Amortization of debt discount and debt issuance costs | 4,421 |  |  | 3,764 |
Amortization of intangible assets | 1,754 |  |  | 1,615 |
Provision for credit losses | 189 |  |  | 1,292 |
(Gain) loss on disposal of assets | (1,299) |  |  | 515 |
Non-cash project revenue related to in-kind leases | (6,384) |  |  | (2,971) |
Earnings from unconsolidated entities | (677) |  |  | (724) |
Net gain from derivatives | (2,154) |  |  | (267) |
Stock-based compensation expense | 10,341 |  |  | 10,368 |
Deferred income taxes, net | (7,808) |  |  | (3,914) |
Unrealized foreign exchange gain | (3,079) |  |  | (898) |
Changes in operating assets and liabilities: |  |  |
Accounts receivable | 18,543 |  |  | (64,045) |
Accounts receivable retainage | (7,155) |  |  | (9,753) |
Federal ESPC receivable | (59,717) |  |  | (110,841) |
Inventory, net | (1,229) |  |  | 1,664 |
Unbilled revenue | (61,835) |  |  | 126,694 |
Prepaid expenses and other current assets | (41,694) |  |  | 15,112 |
Income taxes receivable, net | (1,156) |  |  | 798 |
Project development costs | (3,268) |  |  | (4,456) |
Other assets | (8,218) |  |  | (4,664) |
Accounts payable, accrued expenses and other current liabilities | 17,715 |  |  | 13,511 |
Deferred revenue | 1,877 |  |  | 42,215 |
Other liabilities | 6,600 |  |  | 6,796 |
Cash flows from operating activities | (37,465) |  |  | 99,222 |
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (217) |  |  | (3,053) |
Capital investments in energy assets | (283,370) |  |  | (341,794) |
Capital investments in major maintenance of energy assets | (16,624) |  |  | (13,597) |
Proceeds from sale of investment tax credits | 70,788 |  |  | — |
Net proceeds from equity method investments | — |  |  | 13,091 |
Contributions to equity method investments | (24,264) |  |  | (10,442) |
Grant award received on energy asset | — |  |  | 403 |
Acquisitions, net of cash received | (4,595) |  |  | — |
Cash flows from investing activities | (258,282) |  |  | (355,392) |
See notes to condensed consolidated financial statements.

7

Table of Contents

AMERESCO, INC.
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(In thousands) (Unaudited) (Continued)
| Nine Months Ended September 30,
| 2025 |  | 2024
Cash flows from financing activities: |  |  |
Payments on long-term corporate debt financings | $ | (16,750) |  |  | $ | (68,750) |
Proceeds from long-term corporate debt financings | 100,000 |  |  | 100,000 |
Payments on senior secured revolving credit facility, net | (25,000) |  |  | (33,400) |
Proceeds from long-term energy asset debt financings | 367,329 |  |  | 563,598 |
Payments on long-term energy asset debt and financing leases | (192,460) |  |  | (372,853) |
Proceeds from termination of interest rate swaps | 2,808 |  |  | — |
Payment on seller's promissory note | — |  |  | (41,941) |
Payments of debt discount and debt issuance costs | (7,411) |  |  | (10,114) |
Proceeds from Federal ESPC projects | 82,034 |  |  | 129,399 |
Net (payments) proceeds from energy asset receivable financing arrangements | (415) |  |  | 5,216 |
Proceeds from exercises of options and ESPP | 1,457 |  |  | 1,899 |
Contributions from non-controlling interests | 4,723 |  |  | 33,789 |
Distributions to non-controlling interest | (5,343) |  |  | (1,367) |
Distributions to redeemable non-controlling interests, net | — |  |  | (418) |
Cash flows from financing activities | 310,972 |  |  | 305,058 |
Effect of exchange rate changes on cash | 1,993 |  |  | 1,827 |
Net increase in cash, cash equivalents, and restricted cash | 17,218 |  |  | 50,715 |
Cash, cash equivalents, and restricted cash, beginning of period | 198,378 |  |  | 153,676 |
Cash, cash equivalents, and restricted cash, end of period | $ | 215,596 |  |  | $ | 204,391 |
Supplemental disclosures of cash flow information: |  |  |
Cash paid for interest | $ | 78,436 |  |  | $ | 80,172 |
Cash paid for income taxes | $ | 4,161 |  |  | $ | 1,946 |
Non-cash Federal ESPC settlement | $ | 138,714 |  |  | $ | 143,936 |
Accrued purchases of energy assets | $ | 81,580 |  |  | $ | 53,696 |
Non-cash financing for energy asset project acquisition | $ | — |  |  | $ | 32,500 |

See notes to condensed consolidated financial statements.
8

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited)
1. BASIS OF PRESENTATION
The accompanying condensed consolidated financial statements of Ameresco, Inc. (including its subsidiaries, the “Company,” “Ameresco,” “we,” “our,” or “us”) are unaudited, according to certain rules and regulations of the Securities and Exchange Commission, and include, in our opinion, normal recurring adjustments necessary for a fair presentation in conformity with accounting principles generally accepted in the United States (“GAAP”) of the results for the periods indicated.
The results of operations for the three and nine months ended September 30, 2025 are not necessarily indicative of results which may be expected for the full year. The December 31, 2024 condensed consolidated balance sheet data was derived from audited financial statements, but certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. The interim condensed consolidated financial statements and accompanying notes should be read in conjunction with the audited consolidated financial statements and accompanying notes for the year ended December 31, 2024, included in our annual report on Form 10-K (“2024 Form 10-K”) filed with the Securities and Exchange Commission on February 28, 2025.
Reclassification and Rounding
Certain prior period amounts were reclassified to conform to the presentation in the current period. We round amounts in the condensed consolidated financial statements to thousands and calculate all percentages and per-share data from the underlying whole-dollar amounts. Thus, certain amounts may not foot, crossfoot, or recalculate based on reported numbers due to rounding.
Significant Risks and Uncertainties
Global factors have continued to result in global supply chain disruptions.
We have considered the impact of general global economic conditions on the assumptions and estimates used, which may change in response to this evolving situation. Results of future operations and liquidity could be adversely impacted by a number of factors including supply chain disruptions, varying levels of inflation, payments of outstanding receivable amounts beyond normal payment terms, workforce disruptions, and uncertain demand. As of the date of issuance of these condensed consolidated financial statements, we cannot reasonably estimate the extent to which macroeconomic conditions may impact our financial condition, liquidity, or results of operations in the foreseeable future. The ultimate impact of the general global economic conditions on our business is highly uncertain and will depend on future developments, and such impacts could exist for an extended period of time.
2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Our accounting policies are set forth in Note 2 to the consolidated financial statements contained in our 2024 Form 10-K. We have included certain updates to those policies below.
Accounts Receivable and Allowance for Credit Losses
Changes in the allowance for credit losses are as follows:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Allowance for credit losses, beginning of period | $ | 858 |  |  | $ | 2,060 |  |  | $ | 845 |  |  | $ | 903 |
Charges to costs and expenses, net | 180 |  |  | 81 |  |  | 189 |  |  | 1,292 |
Account write-offs and other | (16) |  |  | (77) |  |  | (12) |  |  | (131) |
Allowance for credit losses, end of period | $ | 1,022 |  |  | $ | 2,064 |  |  | $ | 1,022 |  |  | $ | 2,064 |

Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consist primarily of other receivables, deferred project costs, and other short-term prepaid expenditures that will be expensed within one year.
9

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
Prepaid expenses and other current assets comprised of the following:

| September 30, 2025 |  | December 31, 2024
Other receivables | $ | 35,419 |  |  | $ | 16,336 |
Deferred project costs | 140,124 |  |  | 117,573 |
Prepaid expenses | 14,204 |  |  | 11,997 |
Prepaid expenses and other current assets | $ | 189,747 |  |  | $ | 145,906 |

Other Assets
Other assets include $26,683 in deposits paid to Powin LLC, one of our battery energy storage system suppliers, who filed for Chapter 11 bankruptcy protection on June 10, 2025. See Note 10 Commitments and Contingencies for additional information.
Recent Accounting Pronouncements
Business Combinations— Joint Venture Formations
In August 2023, the FASB issued ASU 2023-05, Business Combinations— Joint Venture Formations (Subtopic 805-60) Recognition and Initial Measurement, which addresses the accounting for contributions made to a joint venture, upon formation, in a joint venture’s separate financial statements. ASU 2023-05 is effective prospectively for all joint venture formations with a formation date on or after January 1, 2025. We adopted this new accounting standard effective January 1, 2025 and the adoption did not have a material impact on our condensed consolidated financial statements.
Income Taxes (Topic 740) - Improvements to Income Tax Disclosures
In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, to enhance the income tax disclosures, including disaggregation of information in the rate reconciliation table and disaggregated information related to income taxes paid. ASU 2023-09 is effective for fiscal years beginning after December 15, 2024. We are currently evaluating the impact that adopting this new accounting standard would have on our annual condensed consolidated financial statements.
Codification Improvements—Amendments to Remove References to the Concepts Statements
In March 2024, the FASB issued ASU 2024-02, Codification Improvements—Amendments to Remove References to the Concepts Statements, to remove references to various FASB Concepts Statements based on suggestions received from stakeholders on the Accounting Standards Codification and other incremental improvements to GAAP. ASU 2024-02 is effective for fiscal years beginning after December 15, 2024. We adopted this accounting standard as of January 1, 2025 and the adoption did not have a material impact on our condensed consolidated financial statements.
Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses
In November 2024, the FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, to improve the disclosures by requiring more detailed information about the types of expenses (including purchases of inventory, employee compensation, depreciation, amortization, and depletion) in commonly presented expense captions (such as cost of sales, SG&A, and research and development). ASU 2024-03 is effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. In January 2025, the FASB issued ASU 2025-01, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40), to modify the effective date previously stated in ASU 2024-03 to clarify that all public business entities are required to adopt the guidance in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. We are currently evaluating the impact that adopting ASU 2024-03 would have on our condensed consolidated financial statements and will adhere to the clarified effective date in ASU 2025-01 if implementation is necessary.
Business Combinations (Topic 805) and Consolidation (Topic 810) - Determining the Accounting Acquirer in the Acquisition of a Variable Interest Entity
In May 2025, the FASB issued ASU 2025-03, Business Combinations (Topic 805) and Consolidation (Topic 810) - Determining the Accounting Acquirer in the Acquisition of a Variable Interest Entity to enhance the ability to compare business combinations
10

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
that do and do not involve variable interest entities by identifying the accounting acquirer. ASU 2025-03 is effective for fiscal years beginning after December 15, 2026. We are currently evaluating the impact that adopting this new accounting standard would have on our annual condensed consolidated financial statements.
3. REVENUE FROM CONTRACTS WITH CUSTOMERS
Disaggregation of Revenue
Our reportable segments for the three and nine months ended September 30, 2025 are North America Regions, U.S. Federal, Europe, Renewable Fuels, and All Other.
The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended September 30, 2025:

| North America Regions |  | U.S. Federal |  | Renewable Fuels |  | Europe |  | All Other |  | Total
Project revenue | $ | 198,448 |  |  | $ | 65,828 |  |  | $ | 5,078 |  |  | $ | 140,598 |  |  | $ | — |  |  | $ | 409,952 |
O&M revenue | 12,397 |  |  | 15,583 |  |  | 1,959 |  |  | 831 |  |  | — |  |  | 30,770 |
Energy assets | 23,647 |  |  | 7,763 |  |  | 30,633 |  |  | 494 |  |  | — |  |  | 62,537 |
Other | 3,108 |  |  | 334 |  |  | 4 |  |  | 2,311 |  |  | 16,971 |  |  | 22,728 |
Total revenues | $ | 237,600 |  |  | $ | 89,508 |  |  | $ | 37,674 |  |  | $ | 144,234 |  |  | $ | 16,971 |  |  | $ | 525,987 |

The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended September 30, 2024:

| North America Regions |  | U.S. Federal |  | Renewable Fuels |  | Europe |  | All Other |  | Total
Project revenue | $ | 258,977 |  |  | $ | 66,162 |  |  | $ | 10,295 |  |  | $ | 49,943 |  |  | $ | — |  |  | $ | 385,377 |
O&M revenue | 10,284 |  |  | 15,817 |  |  | 1,844 |  |  | 480 |  |  | — |  |  | 28,425 |
Energy assets | 20,444 |  |  | 7,096 |  |  | 31,393 |  |  | 197 |  |  | — |  |  | 59,130 |
Other | 1,906 |  |  | 38 |  |  | 5 |  |  | 1,993 |  |  | 23,999 |  |  | 27,941 |
Total revenues | $ | 291,611 |  |  | $ | 89,113 |  |  | $ | 43,537 |  |  | $ | 52,613 |  |  | $ | 23,999 |  |  | $ | 500,873 |

The following table presents our revenue disaggregated by line of business and reportable segment for the nine months ended September 30, 2025:

| North America Regions |  | U.S. Federal |  | Renewable Fuels |  | Europe |  | All Other |  | Total
Project revenue | $ | 521,688 |  |  | $ | 109,325 |  |  | $ | 17,124 |  |  | $ | 371,364 |  |  | $ | — |  |  | $ | 1,019,501 |
O&M revenue | 31,327 |  |  | 44,376 |  |  | 5,736 |  |  | 2,132 |  |  | — |  |  | 83,571 |
Energy assets | 65,286 |  |  | 19,900 |  |  | 95,801 |  |  | 1,152 |  |  | — |  |  | 182,139 |
Other | 8,744 |  |  | 798 |  |  | 7 |  |  | 8,127 |  |  | 48,213 |  |  | 65,889 |
Total revenues | $ | 627,045 |  |  | $ | 174,399 |  |  | $ | 118,668 |  |  | $ | 382,775 |  |  | $ | 48,213 |  |  | $ | 1,351,100 |

11

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
The following table presents our revenue disaggregated by line of business and reportable segment for the nine months ended September 30, 2024:

| North America Regions |  | U.S. Federal |  | Renewable Fuels |  | Europe |  | All Other |  | Total
Project revenue | $ | 553,930 |  |  | $ | 177,721 |  |  | $ | 27,342 |  |  | $ | 161,431 |  |  | $ | — |  |  | $ | 920,424 |
O&M revenue | 25,728 |  |  | 45,723 |  |  | 6,357 |  |  | 2,122 |  |  | — |  |  | 79,930 |
Energy assets | 53,944 |  |  | 12,749 |  |  | 88,421 |  |  | 557 |  |  | 29 |  |  | 155,700 |
Other | 4,425 |  |  | 547 |  |  | 128 |  |  | 5,684 |  |  | 70,423 |  |  | 81,207 |
Total revenues | $ | 638,027 |  |  | $ | 236,740 |  |  | $ | 122,248 |  |  | $ | 169,794 |  |  | $ | 70,452 |  |  | $ | 1,237,261 |

The following table presents information related to our revenue recognized over time:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Percentage of revenue recognized over time | 96% |  | 97% |  | 96% |  | 96%

The remainder of our revenue is for products and services transferred at a point in time, at which point revenue is recognized.
We attribute revenues to customers based on the location of the customer. The following table presents information related to our revenues by geographic area:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
United States | $ | 352,725 |  |  | $ | 431,918 |  |  | $ | 887,261 |  |  | $ | 1,020,517 |
Canada | 29,023 |  |  | 16,337 |  |  | 80,991 |  |  | 46,933 |
Europe | 144,239 |  |  | 52,618 |  |  | 382,848 |  |  | 169,811 |
Total revenues | $ | 525,987 |  |  | $ | 500,873 |  |  | $ | 1,351,100 |  |  | $ | 1,237,261 |

12

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
Contract Balances
The following tables provide information about receivables, contract assets and contract liabilities from contracts with customers:

|  | September 30, 2025 |  | December 31, 2024
Accounts receivable, net |  | $ | 253,793 |  |  | $ | 256,961 |
Accounts receivable retainage, net |  | 48,846 |  |  | 39,843 |
Contract Assets: |  |  |  |
Unbilled revenue |  | $ | 691,316 |  |  | $ | 644,105 |
Contract Liabilities: |  |  |  |
Deferred revenue |  | $ | 87,297 |  |  | $ | 91,734 |
Deferred revenue, non-current (1) |  | 36,369 |  |  | 29,885 |
Total contract liabilities |  | $ | 123,666 |  |  | $ | 121,619 |

| September 30, 2024 |  | December 31, 2023
Accounts receivable, net | $ | 230,298 |  |  | $ | 153,362 |
Accounts receivable retainage, net | 43,466 |  |  | 33,826 |
Contract Assets: |  |  |
Unbilled revenue | $ | 572,804 |  |  | $ | 636,163 |
Contract Liabilities: |  |  |
Deferred revenue | $ | 108,020 |  |  | $ | 52,903 |
Deferred revenue, non-current (1) | 20,808 |  |  | 18,393 |
Total contract liabilities | $ | 128,828 |  |  | $ | 71,296 |
(1) Performance obligations that are expected to be completed beyond the next twelve months and are included in other liabilities in the condensed consolidated balance sheets.

The increase in contract assets for the nine months ended September 30, 2025 was primarily due to revenue recognized of $906,072, as well as reclassifications, primarily from contract liabilities as a result of the timing of customer payments, offset by billings of $886,843. The increase in contract liabilities was primarily driven by the receipt of advance payments from customers, and related billings, as well as reclassifications from contract assets as a result of timing of customer payments. The advance payments and reclassifications exceeded the recognition of revenue as performance obligations were satisfied. For the nine months ended September 30, 2025, we recognized revenue of $350,986 and billed $328,495 to customers that had balances which were included in contract liabilities at December 31, 2024.
The decrease in contract assets for the nine months ended September 30, 2024 was primarily due to revenue recognized of $807,913 offset by billings of $921,597. Contract assets also increased due to reclassifications, primarily from contract liabilities as a result of timing of customer payments. The increase in contract liabilities was primarily driven by the receipt of advance payments from customers, and related billings, as well as reclassifications from contract assets as a result of timing of customer payments. The advance payments and reclassifications exceeded the recognition of revenue as performance obligations were satisfied. For the nine months ended September 30, 2024, we recognized revenue of $284,842 and billed $271,173 to customers that had balances which were included in contract liabilities at December 31, 2023.
13

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
Performance Obligations
Our remaining performance obligations (“backlog”) represent the unrecognized revenue value of our contract commitments. At September 30, 2025, we had contracted backlog of $3,949,124 of which approximately 34% is anticipated to be recognized as revenue in the next twelve months. The remaining performance obligations primarily relate to the energy efficiency and renewable energy construction projects, including long-term operations and maintenance (“O&M”) services related to these projects. The long-term services have varying initial contract terms, up to 27 years.
Deferred Project Costs
Deferred project costs include costs incurred on active projects which will be reclassified either to contract assets or energy assets, as applicable, once a change order or other project resolution is finalized.
Project Development Costs
Project development cos ts of $5,733 and $4,546 were recognized in our condensed consolidated statements of income on projects that converted to customer contracts during the three months ended September 30, 2025 and 2024, respectively. Project development costs of $14,214 and $10,830 were recognized in the condensed consolidated statements of income on projects that converted to customer contracts during the nine months ended September 30, 2025 and 2024, respectively.
No impairment charges in connection with our project development costs were recorded during the three or nine months ended September 30, 2025 and 2024.
4. BUSINESS ACQUISITIONS AND RELATED TRANSACTIONS
We account for acquisitions using the acquisition method in accordance with ASC 805, Business Combinations. The purchase price for each acquisition is allocated to the assets based on their estimated fair values at the date of acquisition. The excess purchase price over the estimated fair value of the net assets acquired, which is calculated using level 3 inputs per the fair value hierarchy as defined in Note 11, is recorded as goodwill. Intangible assets, if identified, are also recorded. See Note 5 for additional information.
ASA Controls, Inc.
On January 24, 2025, we entered into an asset purchase agreement to acquire ASA Controls, Inc., an Ohio-based energy services company that specializes as a regional controls contractor and systems integrator within the smart buildings sector. As of September 30, 2025, we paid $4,595 in cash. There is no contingent consideration related to this acquisition. We recorded goodwill and intangible assets in connection with this acquisition. See Note 5. The historical and pro-forma effects of this acquisition on our operations, contribution to revenue, and net income for the three and nine months ended September 30, 2025 were not material.
5. GOODWILL AND INTANGIBLE ASSETS, NET
The changes in the carrying value of goodwill balances by reportable segment were as follows:

| North America Regions |  | U.S. Federal |  | Europe |  |  |  | Other |  | Total
Carrying Value of Goodwill |  |  |  |  |  |  |  |  |  |  |
Balance, December 31, 2024 | $ | 38,949 |  |  | $ | 3,981 |  |  | $ | 12,539 |  |  |  |  | $ | 10,836 |  |  | $ | 66,305 |
Goodwill acquired during the period | 1,565 |  |  | — |  |  | — |  |  |  |  | — |  |  | 1,565 |
Currency effects | 100 |  |  |  |  | 1,275 |  |  |  |  |  |  | 1,375 |
Balance, September 30, 2025 | $ | 40,614 |  |  | $ | 3,981 |  |  | $ | 13,814 |  |  |  |  | $ | 10,836 |  |  | $ | 69,245 |

14

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
Definite-lived intangible assets, net consisted of the following:

| As of September 30, 2025 |  | As of December 31, 2024
Gross carrying amount | $ | 35,819 |  |  | 33,960 |
Less - accumulated amortization | (27,710) |  |  | (25,146) |
Intangible assets, net | $ | 8,109 |  |  | $ | 8,814 |

The table below sets forth amortization expense:

|  |  |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
Asset type |  | Location |  | 2025 |  | 2024 |  | 2025 |  | 2024
Customer contracts |  | Cost of revenues |  | $ | 53 |  |  | $ | — |  |  | $ | 53 |  |  | $ | — |
Intangible assets, net |  | Selling, general and administrative expenses |  | $ | 581 |  |  | $ | 539 |  |  | $ | 1,701 |  |  | $ | 1,615 |
Total amortization expense |  | $ | 634 |  |  | $ | 539 |  |  | $ | 1,754 |  |  | $ | 1,615 |

6. ENERGY ASSETS, NET
Energy assets, net consisted of the following:

| September 30, 2025 |  | December 31, 2024
Energy assets (1) | $ | 2,615,515 |  |  | $ | 2,338,680 |
Less - accumulated depreciation and amortization | (498,055) |  |  | (423,369) |
Energy assets, net | $ | 2,117,460 |  |  | $ | 1,915,311 |
(1) Includes financing lease assets (see Note 7), capitalized interest and asset retirement obligations (“ARO”) assets (see tables below). Excludes energy assets held for sale. See section below and Note 19 for additional information.

Depreciation and Amortization Expense
The following table sets forth our depreciation and amortization expense on energy assets, net of deferred grant and ITC amortization:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
Location | 2025 |  | 2024 |  | 2025 |  | 2024
Cost of revenues (2) | $ | 26,086 |  |  | $ | 21,667 |  |  | $ | 72,925 |  |  | $ | 57,352 |
(2) Includes depreciation and amortization on financing lease assets (see Note 7). |  |  |  |

Capitalized Interest
The following table presents the interest costs relating to construction financing during the period of construction, which were capitalized as part of energy assets, net:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Capitalized interest | $ | 10,943 |  |  | $ | 12,001 |  |  | $ | 28,895 |  |  | $ | 42,451 |

The following tables set forth information related to our ARO assets and ARO liabilities:

| Location | September 30, 2025 |  | December 31, 2024
ARO assets, net | Energy assets, net | $ | 4,988 |  |  | $ | 4,414 |
ARO liabilities, non-current | Other liabilities | $ | 7,221 |  |  | $ | 6,136 |

15

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)

| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Depreciation expense of ARO assets | $ | 72 |  |  | $ | 65 |  |  | $ | 178 |  |  | $ | 175 |
Accretion expense of ARO liabilities | $ | 108 |  |  | $ | 89 |  |  | $ | 324 |  |  | $ | 243 |

7. LEASES
The table below sets forth supplemental condensed consolidated balance sheet information related to our leases:

| September 30, 2025 |  | December 31, 2024
Operating Leases: |  |  |
Right-of-use (“ROU”) assets | $ | 76,371 |  |  | $ | 80,149 |
Current portions of operating lease liabilities | $ | 8,062 |  |  | $ | 10,536 |
Long-term portions of operating lease liabilities | 56,032 |  |  | 59,479 |
Total operating lease liabilities | $ | 64,094 |  |  | $ | 70,015 |
Weighted-average remaining lease term | 18 years |  | 19 years
Weighted-average discount rate | 6.6 | % |  | 6.6 | %
Financing Leases: |  |  |
Energy assets | $ | 23,581 |  |  | $ | 25,158 |
Current portions of financing lease liabilities | $ | 810 |  |  | $ | 637 |
Long-term financing lease liabilities, net of current portion, unamortized discount and debt issuance costs | 11,845 |  |  | 12,267 |
Total financing lease liabilities | $ | 12,655 |  |  | $ | 12,904 |
Weighted-average remaining lease term | 11 years |  | 12 years
Weighted-average discount rate | 12.0 | % |  | 12.0 | %

The costs related to our leases were as follows:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Operating Leases: |  |  |  |  |  |  |
Operating lease costs | $ | 3,046 |  |  | $ | 3,358 |  |  | $ | 9,558 |  |  | $ | 9,590 |
Financing Leases: |  |  |  |  |  |  |
Amortization expense | 525 |  |  | 526 |  |  | 1,577 |  |  | 1,578 |
Interest on lease liabilities | 448 |  |  | 495 |  |  | 1,225 |  |  | 1,276 |
Total lease costs | $ | 4,019 |  |  | $ | 4,379 |  |  | $ | 12,360 |  |  | $ | 12,444 |

16

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
Supplemental cash flow information related to our leases was as follows:

| Nine Months Ended September 30,
| 2025 |  | 2024
Cash paid for amounts included in the measurement of operating lease liabilities | $ | 11,579 |  |  | $ | 13,530 |
ROU assets obtained in exchange for new operating lease liabilities (1) | $ | 2,973 |  |  | $ | 24,810 |
(1) Includes non-monetary lease transactions of $0 and $10,378 in 2025 and 2024, respectively. See disclosure below for additional information.

The table below sets forth our future lease obligations under our leases:

| Operating Leases |  | Financing Leases
Year ended December 31, |  |  |
2025 | $ | 2,990 |  |  | $ | 919 |
2026 | 11,304 |  |  | 2,054 |
2027 | 9,920 |  |  | 1,922 |
2028 | 8,067 |  |  | 1,955 |
2029 | 5,700 |  |  | 1,892 |
Thereafter | 70,459 |  |  | 14,044 |
Total lease payments | 108,440 |  |  | 22,786 |
Less: interest | 44,346 |  |  | 10,131 |
Present value of lease liabilities | $ | 64,094 |  |  | $ | 12,655 |

We have a future lease commitment for a project lease with the United States Navy (“Navy”) which has not yet met the criteria for recording a right-of-use (“ROU”) asset or lease liability. The estimated net present value of this commitment totals $40,335 as of September 30, 2025. We will provide IKCPs over a thirty-six-year period, which the Navy will credit as consideration towards our lease obligation upon the Navy’s final acceptance of the IKCPs. Once the lease commences, the ROU asset and lease liability will be recorded, which we estimate to be in late 2025 or early 2026.
We have a future lease commitment for a new office and warehouse in Mesa, AZ. The estimated net present value of this commitment totals $1,136 as of September 30, 2025. This new lease agreement was executed September 23, 2025 and the lease will commence March 1, 2026 and will continue for 65 months.
Non-monetary Lease Transactions
We have six lease liabilities consisting of obligations that will be settled with non-monetary consideration. The lease liabilities relating to non-monetary consideration are based on the fair market value of the project services or back up power expected to be provided, which approximate the cash payments.
Financing Leases
Net gains from amortization expense recognized in cost of revenues relating to deferred gains and losses in connection with our sale-leaseback agreements were $57 and $172 for the three and nine months ended September 30, 2025 and 2024, respectively.
17

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
8. DEBT AND FINANCING LEASE LIABILITIES
Our debt and financing lease liabilities are comprised of the following:

| September 30, 2025 |  | December 31, 2024
Senior secured corporate revolving credit facility (1) | $ | 110,000 |  |  | $ | 135,000 |
Senior secured corporate term loans | 96,250 |  |  | 13,000 |
Second lien corporate term loan | 100,000 |  |  | 100,000 |
Energy asset construction facilities (2) | 596,586 |  |  | 339,209 |
Energy asset operating facilities (2) | 613,327 |  |  | 674,704 |
Other financing facilities (3) | 402,192 |  |  | 399,370 |
Financing lease liabilities (4) | 12,655 |  |  | 12,904 |
Total debt and financing lease liabilities | 1,931,010 |  |  | 1,674,187 |
Less: current maturities | 167,083 |  |  | 149,363 |
Less: unamortized discount and debt issuance costs | 47,238 |  |  | 40,924 |
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs | $ | 1,716,689 |  |  | $ | 1,483,900 |
(1) At September 30, 2025, funds of $26,629 were available for borrowing under this facility.
(2) Most of these agreements are now using the Secured Overnight Financing Rate (“SOFR”) as the primary reference rate used to calculate interest.
(3) These facilities are accounted for as failed sale-leasebacks and are classified as long-term financing facilities. See Note 7 for additional disclosures.
(4) Financing lease liabilities are sale-leaseback arrangements under previous guidance.

Senior Secured Corporate Credit Facility
On January 23, 2025, we refinanced our term loan and revolving credit facility by enteri ng into a sixth amended and restated senior secured credit agreement (“Restated Credit Agreement”) with the group of lenders thereto. The interest rate for borrowings is based on, at our option, either the Base Rate plus a margin of 0.75% to 1.75%, depending on our core leverage ratio; or the Term SOFR plus a margin of 1.75% to 2.75%, depending on our core leverage ratio. A commitment fee of between 0.25% and 0.375%, depending on our core leverage ratio, is payable quarterly on the undrawn portion of the revolver. As of September 30, 2025, the interest rates were 7.06% and 7.71% per annum for the term loan and revolving credit facility, respectively. At closing we paid $2,345 in lenders fees and debt issuance costs. Proceeds from this agreement in the amount of $180,000 and $13,000 were used to pay the balance of our revolving credit facility and the outstanding portion of the senior secured term loan, respectively, at closing.
The Restated Credit Agreement replaced and extended Ameresco's existing credit agreement dated March 4, 2022, and subsequently amended (the “Original Credit Agreement”). The Restated Credit Agreement refinanced the credit facilities under the Original Credit Agreement and replaced it with the following facilities:
•a $225,000 revolving credit facility, maturing on December 28, 2028, and
•a $100,000 term loan, maturing on December 28, 2028
The revolver may be increased by up to an additional $100,000 at Ameresco's option if lenders are willing to provide such increased commitments, subject to certain conditions.
Additional t erms of the Restated Credit Agreement are as follows:
•the term loan requires quarterly principal payments of $1,250 starting March 31, 2025, with the balance due at maturity
•the revolving credit facility requires payment at maturity
•a debt service coverage ratio (as defined in the agreement) of at least 1.5 to 1.0
•a total funded debt to EBITDA of less than 3.5 to 1.0
18

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
April 2025 Senior Secured Notes, 6.72%, due September 30, 2045 and Term Shelf Note
On April 30, 2025 we entered into a note purchase agreement and private shelf agreement which includes committed proceeds under series A notes of $78,000 to finance a battery energy storage asset in development, with a maturity date of September 30, 2045, and a fixed interest rate of 6.72% per annum. Gross proceeds from the initial issuance on April 30, 2025 were $67,708 with the remaining $10,291 issued on June 27, 2025. At closing, we incurred $3,126 in lenders fees and debt issuance costs. In connection with this note, we recorded one derivative instrument for make-whole provisions with an initial value of $3,040 which was recorded as debt discount. The agreement also includes a 20-year term $300,000 private shelf facility, as well as the ability to issue series B notes with a maturity date of September 30, 2045 on or before December 31, 2025. As part o f this transaction, we signed a tax credit transfer agreement for the investment tax credits associated with the BESS asset. Upon the asset achieving commercial operations, we will receive proceeds from the ITC transfer and a $30,000 prepayment on the note purchase agreement will be required.
May 2025, Term Loan, 6.62%, due December 31, 2037
On May 27, 2025, we entered into a term loan agreement which provided a term loan in a principal amount of $12,221 with a maturity date of December 31, 2037. The term loan bears a fixed interest rate of 6.62%. Interest is payable quarterly. At closing, we incurred $402 in lenders fees and debt issuance costs. Proceeds from this term loan in the amount of $8,273 were used to pay a portion of the October 2012 term loan. In connection with this term loan we recorded one derivative instrument for a make-whole provision with an initial value of $347 which was recorded as debt discount.
See Note 12 for additional information about the derivative instruments.
October 2012, Term Loan, 6.87%, due June 30, 2025
On May 27, 2025, we paid off the term loan with a balance of $31,086, partially with $8,273 from the May 2025 term loan proceeds and the remainder with working capital cash. With this debt termination, we also terminated four interest rate swap contracts that were not previously designated as hedged instruments.
October 2022, Financing Facility, 8.75%, due September 26, 2040
On May 27, 2025 we entered into an omnibus amendment a s part of a tax credit transfer agreement for investment tax credits. The amendment required a $7,000 principal payment, which was made during the nine months ended September 30, 2025.
On September 26, 2025 we entered into an amendment to modify the May 27, 2025 omnibus amendment. This amendment included advances of $25,500 related to an expansion project and $15,653 related to a true-up payment in connection to the removal of an IRR residual income requirement. Prior to this amendment, the loan bore interest at a rate of 6.70% with a residual percentage of distributable cash flows payable after the maturity date of the loan, until the earlier of the lender achieving an 8.51% internal rate of return (“IRR”) on funds borrowed under the facility, or the facility discharge date. The interest rate is now fixed at 8.75% and the maturity date changed from August 31, 2039 to September 26, 2040.
At September 30, 2025, $348,182 was outstanding under this facility, net of unamortized debt discount and issuance costs.
August 2023, Construction Credit Facility, 8.31%, due December 15, 2027
During the nine months ended September 30, 2025, we drew an additional $171,448, paid down $75,272, and at September 30, 2025, $408,483 was outstanding under this facility, net of unamortized debt discount and issuance costs. The Powin bankruptcy triggered a default under this facility, requiring us to move the project associated with the battery payment deposits we made to Powin out of this facility. There were other administrative errors which resulted in defaults under this facility. We received the appropriate waivers for these defaults. In addition, we received a waiver to temporarily increase our maximum commitment of $400,000 to $415,000 until November 30, 2025.
June 2020, Construction Credit Facility, 5.92%, due March 31, 2026
During the nine months ended September 30, 2025, we entered into an amendment to extend this revolver, and the current maturity date is March 31, 2026.
As of September 30, 2025, $19,505 was outstanding under this facility and $80,495 was available for borrowing.
19

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
October 2025 Senior Secured First Lien Term Notes, 5.71%, due December 31, 2043, Second Lien Term Notes, 7.40%, due September 30, 2040 and Term Shelf Note
On October 31, 2025 we entered into a note purchase agreement and private shelf agreement which includes committed proceeds under series A notes and second lien notes of $34,356 and $15,129, with maturity dates of December 31, 2043 and September 30, 2040, and fixed interest rates of 5.71% and 7.40% per annum, respectively. At closing, we incurred $763 in lenders fees and debt issuance costs. The agreement also includes a 20-year term $80,000 private shelf facility.
Other Financing Facilities
These facilities are accounted for as failed sale-leasebacks and are classified as long-term financing facilities.
August 2018 Master Sale-leaseback
We enter into amendments to our August 2018 master lease and participation agreement from time to time, which may extend the maturity date, increase the availability, or modify other covenants. During the nine months ended September 30, 2025, we entered into an amended and restated participation agreement which extended the participation date from September 30, 2025 to March 31, 2026. During the nine months ended September 30, 2025, we were in default of certain lien provisions of this agreement. On June 30, 2025, we received a waiver of this default which is valid until December 31, 2025.
We sold and leased back eight energy assets for $28,554 in cash proceeds under this facility during the nine months ended September 30, 2025.
December 2020 Master Sale-leaseback
We enter into amendments to our December 2020 master lease and participation agreement from time to time, which may extend the maturity date, increase the availability, or modify other covenants. As of September 30, 2025, we were in default under this agreement as we had failed to satisfy the historical coverage ratio under this agreement and on October 31, 2025 we received a waiver of this default.
9. INCOME TAXES
We recorded an income tax benefit of $3,678 and $3,324 for the three months ended September 30, 2025 and 2024, respectively. We recorded an income tax benefit of $5,390 and $3,324 for the nine months ended September 30, 2025 and 2024, respectively.
The effective tax rate benefit was 20.3% for the three months ended September 30, 2025, compared to the effective tax rate benefit of 24.3% for the three months ended September 30, 2024. The effective tax rate benefit was 20.4% for the nine months ended September 30, 2025, compared to effective tax rate of 26.2% for the nine months ended September 30, 2024. The principal reasons for the higher effective rate for the three months and nine months ended September 30, 2025 is due to the effects of lower Section 179D Energy Efficient Building deductions and effects of foreign earnings, offset by higher investment tax credits from solar, and storage plants placed into service or are forecasted to be placed into service during 2025.
10. COMMITMENTS AND CONTINGENCIES
From time to time, we issue letters of credit and performance bonds with our third-party lenders, to provide collateral.
Legal Proceedings
We are involved in a variety of other claims and other legal proceedings generally incidental to our normal business activities. When we conclude that it is probable that a liability has been incurred and the amount of the liability can be reasonably estimated, it is accrued through a charge to earnings and, if material, disclosed below. When only a range of amounts is reasonably estimable and no amount within the range is more likely than another, the low end of the range is recorded. While the ultimate amount of liability incurred in any of these matters is dependent on future developments, in our opinion, the recorded liability is adequate to cover the future payment of such liability and claims. However, the final outcome of any of these claims and legal proceedings cannot be predicted with certainty, and unfavorable or unexpected outcomes could result in additional accruals that could be significant to results of operations in a particular year or quarter. Any adjustments to the recorded liability will be reflected in earnings in the periods in which such adjustments become known. For any other claims where a loss may be reasonably possible, but not probable, or is probable but not reasonably estimable, no accrual is established, but the matter, if potentially material, is disclosed below. We routinely review relevant information with respect to our matters and update our accruals, disclosures and
20

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
estimates of reasonably possible loss based on such reviews. While the outcome of any of these matters cannot be accurately predicted, we do not believe the ultimate resolution of any of these existing matters would have a material adverse effect on our financial condition or results of operations.
In October 2021, we entered into a contract with SCE to design and build three grid scale battery energy storage system (“BESS”) at three sites near existing substation parcels throughout SCE’s service territory in California with an aggregate capacity of 537.5 megawatt (“MW”) (“the SCE Agreement”). As previously disclosed, due to supply chain delays, weather, and other events, we were unable to complete the projects by August 1, 2022 (the “Guaranteed Completion Date”) and made related force majeure claims. In late 2022, SCE also instructed us to adjust the completion of the sites into 2023. Under the SCE Agreement, a failure to reach the Guaranteed Co mpletion Date could, under certain circumstances, result in liquidated damages up to a maximum amount of $89 million being applied. On August 30, 2024, we reached an agreement with SCE on the substantial completion of two out of three battery energy storage system projects. We received approximately $110 million on September 5, 2024 as milestone payments, reflecting a set-off of liquidated damages for these two projects. The agreement confirmed that the final resolution related to our obligation to pay the liquidated damages withheld and the applicability and scope of any force majeure relief as well as any cost recovery we may be entitled to remain subject to dispute. We are continuing discussions with SCE on these matters, and our view continues to be that liquidated damages should not be applied. It is at least reasonably possible we may incur an obligation to pay liquidated damages up to the maximum amount.
Commitments as a Result of Acquisitions
In December 2021, we completed our acquisition of Plug Smart which provided for an earn-out based on future EBITDA targets beginning with EBITDA performance for the month of December 2021 and each fiscal year thereafter, over a five-year period through December 31, 2026. The maximum cumulative earn-out is $5,000 and we evaluated financial forecasts of the acquired business and concluded that the fair value of this earn-out after deducting payment previously made was approximately $1,614 at December 31, 2024. As of September 30, 2025, the EBITDA targets and maximum cumulative earn-out were achieved, and the fair value of the remaining contingent consideration increased by $71 to $1,685. A final payment of $1,685 was made as of September 30, 2025. See Note 11 for additional information.
Powin LLC
On June 10, 2025, Powin LLC (“Powin”), one of our BESS suppliers, voluntarily filed for protection under Chapter 11 of the U.S. Bankruptcy Code in the United States Bankruptcy Court. As of the date of this report, Ameresco paid Powin $26,683 in deposits for transactions that never materialized and are recorded within other assets in the accompanying condensed consolidated balance sheets. We are actively monitoring the proceedings, and the range of loss is between $0 and $26,683. Since it is early in the bankruptcy proceedings a loss cannot be reasonably estimated, therefore, no loss has been accrued at this time.
11. FAIR VALUE MEASUREMENT
We recognize our financial assets and liabilities at fair value on a recurring basis. Fair value is defined as the price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Three levels of inputs that may be used to measure fair value are as follows:
Level 1: Inputs are based on unadjusted quoted prices for identical instruments traded in active markets.
Level 2: Inputs are based on quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Level 3: Inputs are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques that include option pricing models, discounted cash flow models, and similar techniques.
21

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
The following table presents the input level used to determine the fair values of our financial instruments measured at fair value on a recurring basis:

|  |  | Fair Value as of
| Level |  | September 30, 2025 |  | December 31, 2024
Assets: |  |  |  |  |
Interest rate swap instruments | 2 |  | $ | 669 |  |  | $ | 5,096 |
Liabilities: |  |  |  |  |
Interest rate swap instruments | 2 |  | $ | 333 |  |  | $ | — |
Make-whole provisions | 2 |  | 15,747 |  |  | 15,574 |
Contingent consideration | 3 |  | — |  |  | 1,614 |
Total liabilities |  |  | $ | 16,080 |  |  | $ | 17,188 |

The following table sets forth a summary of changes in the fair value of contingent consideration liability classified as level 3:

| Fair Value as of
| September 30, 2025 |  | December 31, 2024
Contingent consideration liability balance at the beginning of period | $ | 1,614 |  |  | $ | 1,465 |
Changes in fair value included in earnings | 71 |  |  | 149 |
Payment of contingent consideration | (1,685) |  |  | — |
Contingent consideration liability balance at the end of period | $ | — |  |  | $ | 1,614 |

The following table sets forth the fair value and the carrying value of our long-term debt, excluding financing leases:

| As of September 30, 2025 |  | As of December 31, 2024
| Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value
Long-term debt (Level 2) | $ | 1,855,148 |  |  | $ | 1,871,117 |  |  | $ | 1,618,208 |  |  | $ | 1,620,359 |

The fair value of our long-term debt was estimated using discounted cash flows analysis, based on our current incremental borrowing rates for similar types of borrowing arrangements which are considered to be level two inputs. There have been no transfers in or out of level two or three financial instruments for the nine months ended September 30, 2025 and the year ended December 31, 2024.
We are also required to periodically measure certain other assets at fair value on a nonrecurring basis, including long-lived assets, goodwill and other intangible assets. We calculated the fair value used in our annual goodwill impairment analysis utilizing a discounted cash flow analysis and determined that the inputs used were level 3 inputs. There were no assets recorded at fair value on a non-recurring basis as of September 30, 2025 or December 31, 2024.
12. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
The following table presents information about the fair value amounts of our cash flow derivative instruments:

|  |  | Derivatives as of
|  |  | September 30, 2025 |  | December 31, 2024
| Balance Sheet Location |  | Fair Value |  | Fair Value
Derivatives Designated as Hedging Instruments: |  |  |  |  |
Interest rate swap contracts | Other assets |  | $ | 669 |  |  | $ | 1,556 |
Derivatives Not Designated as Hedging Instruments: |  |  |  |  |
Interest rate swap contracts | Other assets |  | $ | — |  |  | $ | 3,540 |
Interest rate swap contracts | Other liabilities |  | $ | 333 |  |  | $ | — |
Make-whole provisions | Other liabilities |  | $ | 15,747 |  |  | $ | 15,574 |

22

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
During the nine months ended September 30, 2025, in connection with the payment in full of the October 2012 Term Loan, we terminated the related interest rate swap contracts that were not designated as hedging instruments and received $2,808 in proceeds upon settlement. We also added 2 embedded derivatives for make-whole provisions with an initial fair value totaling $3,387 during the nine months ended September 30, 2025. See Note 8 for additional information about the financings.
The following table presents information about the effects of our derivative instruments on our condensed consolidated statements of income and condensed consolidated statements of comprehensive income:

|  |  | Amount of (Gain) Loss Recognized in Net Income
| Location of (Gain) Loss Recognized in Net Income |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Derivatives Designated as Hedging Instruments: |  |  |  |  |  |  |  |
Interest rate swap contracts | Other expenses, net |  | $ | (91) |  |  | $ | (259) |  |  | $ | (295) |  |  | $ | (806) |
Derivatives Not Designated as Hedging Instruments: |  |  |  |  |  |  |  |
Interest rate swap contracts | Other expenses, net |  | $ | 55 |  |  | $ | 2,109 |  |  | $ | 1,065 |  |  | $ | 778 |
Make-whole provisions | Other expenses, net |  | $ | 758 |  |  | $ | 1,592 |  |  | $ | (3,219) |  |  | $ | (1,045) |

The following table presents the changes in Accumulated Other Comprehensive Income (“AOCI”), net of taxes, from our hedging instruments:

| Nine Months Ended September 30, 2025 |  |
Derivatives Designated as Hedging Instruments: |  |  |
Accumulated gain in AOCI at the beginning of the period | $ | 1,140 |  |  |
Unrealized loss recognized in AOCI | (400) |  |  |
Gain reclassified from AOCI to other expenses, net | (295) |  |  |
Loss on derivatives | (695) |  |  |
Accumulated gain in AOCI at the end of the period | $ | 445 |  |  |

The following tables present all of our active derivative instruments as of September 30, 2025:

Active Interest Rate Swaps |  |  |  | Expiration Date |  | Initial Notional Amount ($) |  | Status
11-Year, 5.77% Fixed |  |  |  | October 2029 |  | $ | 9,200 |  |  | Designated
15-Year, 5.24% Fixed |  |  |  | June 2033 |  | $ | 10,000 |  |  | Designated
10-Year, 4.74% Fixed |  |  |  | December 2027 |  | $ | 14,100 |  |  | Designated
17.75-Year, 3.16% Fixed |  |  |  | December 2040 |  | $ | 14,084 |  |  | Designated
18-Year, 3.81% Fixed |  |  |  | July 2041 |  | $ | 32,021 |  |  | Not Designated

23

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)

Other Derivatives |  | Classification |  | Effective Date |  | Expiration Date |  | Fair Value ($)
Make-whole provisions |  | Liability |  | June/August 2018 |  | December 2038 |  | $ | 107 |
Make-whole provisions |  | Liability |  | August 2016 |  | April 2031 |  | $ | 16 |
Make-whole provisions |  | Liability |  | April 2017 |  | February 2034 |  | $ | 12 |
Make-whole provisions |  | Liability |  | November 2020 |  | December 2027 |  | $ | 5 |
Make-whole provisions |  | Liability |  | October 2011 |  | May 2028 |  | $ | 2 |
Make-whole provisions |  | Liability |  | May 2021 |  | April 2045 |  | $ | 43 |
Make-whole provisions |  | Liability |  | March 2023 |  | December 2047 |  | $ | 1,529 |
Make-whole provisions |  | Liability |  | June 2022 |  | March 2042 |  | $ | 689 |
Make-whole provisions |  | Liability |  | July 2021 |  | March 2046 |  | $ | 1,898 |
Make-whole provisions |  | Liability |  | April 2024 |  | June 2042 |  | $ | 7,994 |
Make-whole provisions |  | Liability |  | April 2024 |  | June 2042 |  | $ | 1,082 |
Make-whole provisions |  | Liability |  | April 2025 |  | September 2045 |  | $ | 2,147 |
Make-whole provisions |  | Liability |  | May 2025 |  | December 2037 |  | $ | 225 |

24

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
13. VARIABLE INTEREST ENTITIES AND EQUITY METHOD INVESTMENTS
Variable Interest Entities
The table below presents a summary of amounts related to our consolidated investment funds and joint ventures, which we determined meet the definition of a variable interest entity (“VIE”), as of:

| September 30, 2025 (1) |  | December 31, 2024 (1) |  |  |  |  |  |
| Investment Funds |  | Other VIEs |  | Total VIEs |  | Investment Funds |  | Other VIEs |  | Total VIEs |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 32 |  |  | $ | 12,848 |  |  | $ | 12,880 |  |  | $ | 89 |  |  | $ | 8,691 |  |  | $ | 8,780 |  |  |  |  |  |  |  |  |  |  |
Restricted cash | — |  |  | 17,028 |  |  | 17,028 |  |  | — |  |  | — |  |  | — |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 471 |  |  | 25,268 |  |  | 25,739 |  |  | — |  |  | 14,607 |  |  | 14,607 |  |  |  |  |  |  |  |  |  |  |
Unbilled revenue | — |  |  | 103,025 |  |  | 103,025 |  |  | 230 |  |  | 4,040 |  |  | 4,270 |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets | — |  |  | 6,781 |  |  | 6,781 |  |  | 30 |  |  | 7,088 |  |  | 7,118 |  |  |  |  |  |  |  |  |  |  |
Income taxes receivable | — |  |  | 2,729 |  |  | 2,729 |  |  | — |  |  | 672 |  |  | 672 |  |  |  |  |  |  |  |  |  |  |
Total VIE current assets | 503 |  |  | 167,679 |  |  | 168,182 |  |  | 349 |  |  | 35,098 |  |  | 35,447 |  |  |  |  |  |  |  |  |  |  |
Energy assets, net | 22,390 |  |  | 90,215 |  |  | 112,605 |  |  | 23,538 |  |  | 98,876 |  |  | 122,414 |  |  |  |  |  |  |  |  |  |  |
Deferred income tax assets, net | — |  |  | 2,349 |  |  | 2,349 |  |  | — |  |  | — |  |  | — |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net | — |  |  | — |  |  | — |  |  | — |  |  | 20 |  |  | 20 |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets, net | 461 |  |  | — |  |  | 461 |  |  | 471 |  |  | — |  |  | 471 |  |  |  |  |  |  |  |  |  |  |
Restricted cash, non-current portion | — |  |  | 1,747 |  |  | 1,747 |  |  | — |  |  | — |  |  | — |  |  |  |  |  |  |  |  |  |  |
Other assets | — |  |  | 105 |  |  | 105 |  |  | — |  |  | 196 |  |  | 196 |  |  |  |  |  |  |  |  |  |  |
Total VIE assets | $ | 23,354 |  |  | $ | 262,095 |  |  | $ | 285,449 |  |  | $ | 24,358 |  |  | $ | 134,190 |  |  | $ | 158,548 |  |  |  |  |  |  |  |  |  |  |
Current portions of long-term debt and financing lease liabilities | $ | — |  |  | $ | 32,143 |  |  | $ | 32,143 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 68 |  |  | 86,070 |  |  | 86,138 |  |  | 27 |  |  | 5,140 |  |  | 5,167 |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities | 20 |  |  | 8,356 |  |  | 8,376 |  |  | 25 |  |  | 577 |  |  | 602 |  |  |  |  |  |  |  |  |  |  |
Current portions of operating lease liabilities | 13 |  |  | — |  |  | 13 |  |  | 13 |  |  | — |  |  | 13 |  |  |  |  |  |  |  |  |  |  |
Deferred revenue | — |  |  | 18,564 |  |  | 18,564 |  |  | — |  |  | 10,063 |  |  | 10,063 |  |  |  |  |  |  |  |  |  |  |
Income taxes payable | — |  |  | 369 |  |  | 369 |  |  | — |  |  | 526 |  |  | 526 |  |  |  |  |  |  |  |  |  |  |
Total VIE current liabilities | 101 |  |  | 145,502 |  |  | 145,603 |  |  | 65 |  |  | 16,306 |  |  | 16,371 |  |  |  |  |  |  |  |  |  |  |
Long-term operating lease liabilities, net of current portion | 479 |  |  | — |  |  | 479 |  |  | 500 |  |  | — |  |  | 500 |  |  |  |  |  |  |  |  |  |  |
Total VIE liabilities | $ | 580 |  |  | $ | 145,502 |  |  | $ | 146,082 |  |  | $ | 565 |  |  | $ | 16,306 |  |  | $ | 16,871 |  |  |  |  |  |  |  |  |  |  |
(1) The amounts in the above table are reflected in Note 1 on our condensed consolidated balance sheets. |  |  |  |  |  |  |  |  |  |

See Note 14 for additional information on the call and put options related to our investment funds.
Non-controlling Interests
Non-controlling interests represents the equity owned by the other joint venture members of consolidated joint ventures. On February 9, 2024, we entered into an agreement to sell a 40% interest in an energy asset, thus forming a joint venture, and we received $28,864 in cash. We also received additional contributions totaling $6,543 during the year ended December 31, 2024 and $4,723 during the nine months ended September 30, 2025.
Equity and Cost Method Investments
Unconsolidated joint ventures are accounted for under the equity method. For these unconsolidated joint ventures, our investment balances are included in other assets on the condensed consolidated balance sheets, and our pro rata share of net income or loss is included in earnings from unconsolidated entities on the condensed consolidated statements of income.
25

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
The following table provides information about our equity and cost method investments in joint ventures:

|  |  |  |  | As of
|  |  |  |  | September 30, 2025 |  | December 31, 2024
Equity and cost method investments |  |  |  |  | $ | 42,261 |  |  | $ | 16,987 |

14. REDEEMABLE NON-CONTROLLING INTERESTS
Our subsidiaries with membership interests in the investment funds we formed have the right to elect to require the non-controlling interest holder to sell all of its membership units to our subsidiaries, a call option. Our investment fund also includes rights for the non-controlling interest holder to elect to require our subsidiaries to purchase all of the non-controlling membership interests in the fund, a put option.
We had one investment fund remaining as of September 30, 2025 and December 31, 2024.
We initially record our redeemable non-controlling interests at fair value on the date of acquisition and subsequently adjust to redemption value. At both September 30, 2025 and December 31, 2024, the remaining redeemable non-controlling interest was reported at its carrying values, as the carrying value at each reporting period was greater than the estimated redemption value.
15. EARNINGS PER SHARE
Earnings Per Share
The following is a reconciliation of the numerator and denominator for the computation of basic and diluted loss per share:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In thousands, except per share data) | 2025 |  | 2024 |  | 2025 |  | 2024
Numerator: |  |  |  |  |  |  |
Net income attributable to common shareholders | $ | 18,532 |  |  | $ | 17,599 |  |  | $ | 25,914 |  |  | $ | 19,672 |
Adjustment for accretion of tax equity financing fees | (27) |  |  | (26) |  |  | (82) |  |  | (80) |
Income attributable to common shareholders | $ | 18,505 |  |  | $ | 17,573 |  |  | $ | 25,832 |  |  | $ | 19,592 |
Denominator: |  |  |  |  |  |  |
Basic weighted-average shares outstanding | 52,716 |  |  | 52,413 |  |  | 52,633 |  |  | 52,352 |
Effect of dilutive securities: (1) |  |  |  |  |  |  |
Stock options | 654 |  |  | 830 |  |  | 462 |  |  | 746 |
Diluted weighted-average shares outstanding | 53,370 |  |  | 53,243 |  |  | 53,095 |  |  | 53,098 |
Net Income per share attributable to common shareholders: |  |  |  |  |  |  |
Basic | $ | 0.35 |  |  | $ | 0.34 |  |  | $ | 0.49 |  |  | $ | 0.37 |
Diluted | $ | 0.35 |  |  | $ | 0.33 |  |  | $ | 0.49 |  |  | $ | 0.37 |
Potentially dilutive shares (1) | 2,789 |  |  | 2,204 |  |  | 2,718 |  |  | 2,084 |
(1) Dilutive securities and potentially dilutive shares attributable to stock options were excluded from the computation of diluted earnings per share as the effect would have been anti-dilutive.

16. STOCK-BASED COMPENSATION
We recorded stock-based compensation expense, including expenses related to the estimated achievement of the performance metrics of performance-based stock options (“PSOs”) granted during the three and nine months ended September 30, 2025, and
26

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
employee stock purchase plan, as follows:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Stock-based compensation expense | $ | 3,746 |  |  | $ | 3,664 |  |  | $ | 10,341 |  |  | $ | 10,368 |

Our stock-based compensation expense is included in selling, general and administrative expenses in the condensed consolidated statements of income. As of September 30, 2025, there was $23,944 of unrecognized compensation expense related to non-vested stock option awards that is expected to be recognized over a weighted-average period of 2.5 years. This includes $3,864 of unrecognized compensation expense related to PSOs based on our current assessment of probability. There is an additional $7,849 of unrecognized compensation expense if the PSOs were to achieve 100% probability.
Stock Option and Restricted Stock Units (“RSUs”) Grants
During the nine months ended September 30, 2025, we granted 1,416 common stock options to certain employees under our 2020 Stock Incentive Plan (“2020 Plan”), which have a contractual life of ten years and vest over a three or five-year period. We also granted awards of 137 RSUs to certain employees and directors under our 2020 Plan. RSUs for directors cliff vest after one year and RSUs for employees vest 25% every six months for two years. We did not grant awards to individuals who were not either an employee or director of ours during the nine months ended September 30, 2025 and 2024.
17. BUSINESS SEGMENT INFORMATION
Our reportable segments are North America Regions, U.S. Federal, Europe, Renewable Fuels, and All Other.
Our North America Regions, U.S. Federal, and Europe segments offer energy efficiency products and services which include the design, engineering, and installation of equipment and other measures to improve the efficiency and control the operation of a facility’s energy infrastructure, renewable energy solutions, and services which include the construction of small-scale plants that Ameresco owns or develops for customers that produce electricity, gas, heat, or cooling from renewable sources of energy and O&M services.
Our Renewable Fuels segment sells electricity, processed renewable gas fuel, heat or cooling, produced from renewable sources of energy, other than solar, and generated by small-scale plants that we own and O&M services for customer owned small-scale plants. Our North America Regions segment also includes certain small-scale solar grid-tie plants developed for customers.
The “All Other” category offers consulting services and the sale of solar PV energy products and systems which we refer to as integrated-PV.
These segments do not include results of other activities, such as corporate operating expenses not specifically allocated to the segments. Certain reportable segments are an aggregation of operating segments.
Our Chief Executive Officer and President is our chief operating decision maker (“CODM”). The CODM is responsible for making operating decisions, allocating resources, and assessing performance of the business segments. The CODM uses the segments’ income before income taxes as the profitability measure in making these decisions.
The tables below present our business segment information recast for the prior-year period and a reconciliation to the condensed consolidated financial statements.
27

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)

Three Months Ended September 30, 2025
|  | North America Regions |  | U.S. Federal |  | Renewable Fuels |  | Europe |  | All Other |  | Corporate |  | Total
Revenues |  | $ | 237,600 |  |  | $ | 89,508 |  |  | $ | 37,674 |  |  | $ | 144,234 |  |  | $ | 16,971 |  |  |  |  | $ | 525,987 |
Cost of revenues |  | 195,172 |  |  | 73,649 |  |  | 28,252 |  |  | 133,053 |  |  | 11,532 |  |  |  |  | 441,658 |
Gross profit |  | 42,428 |  |  | 15,859 |  |  | 9,422 |  |  | 11,181 |  |  | 5,439 |  |  |  |  | 84,329 |
Add: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from unconsolidated entities |  | 37 |  |  | 1,127 |  |  | — |  |  | 229 |  |  | — |  |  | — |  |  | 1,393 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  | 12,749 |  |  | 3,057 |  |  | 605 |  |  | 5,539 |  |  | 3,751 |  |  | 17,671 |  |  | 43,372 |
Loss on derivatives |  | 740 |  |  | 55 |  |  | 18 |  |  | — |  |  | — |  |  | — |  |  | 813 |
Interest expense and interest income, net |  | 3,780 |  |  | 840 |  |  | 7,882 |  |  | 866 |  |  | — |  |  | 7,117 |  |  | 20,485 |
Other expense |  | 372 |  |  | 177 |  |  | 82 |  |  | 1,462 |  |  | 1 |  |  | 796 |  |  | 2,890 |
Income (loss) before income taxes |  | $ | 24,824 |  |  | $ | 12,857 |  |  | $ | 835 |  |  | $ | 3,543 |  |  | $ | 1,687 |  |  | $ | (25,584) |  |  | $ | 18,162 |
Other Non-cash Segment Disclosures:
Depreciation and intangible asset amortization (1) |  | 10,769 |  |  | 4,981 |  |  | 10,446 |  |  | 628 |  |  | 31 |  |  | 380 |  |  | 27,235 |
Amortization of debt discount & debt issuance costs (1) |  | 582 |  |  | 176 |  |  | 82 |  |  | 89 |  |  | — |  |  | 643 |  |  | 1,572 |
(1) These amounts disclosed by reportable segment are included within the other segment expense captions.

Three Months Ended September, 2024
|  | North America Regions |  | U.S. Federal |  | Renewable Fuels |  | Europe |  | All Other |  | Corporate |  | Total
Revenues |  | $ | 291,611 |  |  | $ | 89,113 |  |  | $ | 43,537 |  |  | $ | 52,613 |  |  | $ | 23,999 |  |  |  |  | $ | 500,873 |
Cost of revenues |  | 251,324 |  |  | 72,872 |  |  | 33,430 |  |  | 50,103 |  |  | 16,005 |  |  |  |  | 423,734 |
Gross profit |  | 40,287 |  |  | 16,241 |  |  | 10,107 |  |  | 2,510 |  |  | 7,994 |  |  |  |  | 77,139 |
Add: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from unconsolidated entities |  | 25 |  |  | 134 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 159 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  | 12,087 |  |  | 3,085 |  |  | 788 |  |  | 4,243 |  |  | 5,404 |  |  | 16,532 |  |  | 42,139 |
Loss on derivatives |  | 1,592 |  |  | 1,342 |  |  | 767 |  |  | — |  |  | — |  |  | — |  |  | 3,701 |
Interest expense and interest income, net |  | 3,577 |  |  | 2,017 |  |  | 6,203 |  |  | 1,371 |  |  | (1) |  |  | 5,249 |  |  | 18,416 |
Other expense |  | 394 |  |  | 388 |  |  | 113 |  |  | 181 |  |  | 11 |  |  | (1,735) |  |  | (648) |
Income (loss) before income taxes |  | $ | 22,662 |  |  | $ | 9,543 |  |  | $ | 2,236 |  |  | $ | (3,285) |  |  | $ | 2,580 |  |  | $ | (20,046) |  |  | $ | 13,690 |
Other Non-cash Segment Disclosures:
Depreciation and intangible asset amortization (1) |  | 9,552 |  |  | 4,751 |  |  | 7,494 |  |  | 503 |  |  | 689 |  |  | 464 |  |  | 23,453 |
Amortization of debt discount & debt issuance costs (1) |  | 552 |  |  | 390 |  |  | 113 |  |  | — |  |  | — |  |  | 387 |  |  | 1,442 |
(1) These amounts disclosed by reportable segment are included within the other segment expense captions.

28

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)

Nine Months Ended September 30, 2025
|  | North America Regions |  | U.S. Federal |  | Renewable Fuels |  | Europe |  | All Other |  | Corporate |  | Total
Revenues |  | $ | 627,045 |  |  | $ | 174,399 |  |  | $ | 118,668 |  |  | $ | 382,775 |  |  | $ | 48,213 |  |  |  |  | $ | 1,351,100 |
Cost of revenues |  | 526,270 |  |  | 140,788 |  |  | 93,409 |  |  | 348,769 |  |  | 32,258 |  |  |  |  | 1,141,494 |
Gross profit |  | 100,775 |  |  | 33,611 |  |  | 25,259 |  |  | 34,006 |  |  | 15,955 |  |  |  |  | 209,606 |
Add: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from unconsolidated entities |  | 92 |  |  | 1,127 |  |  | — |  |  | 585 |  |  | — |  |  | — |  |  | 1,804 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  | 39,959 |  |  | 9,496 |  |  | 2,728 |  |  | 15,760 |  |  | 10,729 |  |  | 48,921 |  |  | 127,593 |
(Gain) loss on derivatives |  | (3,097) |  |  | 788 |  |  | 155 |  |  | — |  |  | — |  |  | — |  |  | (2,154) |
Interest expense, net of interest income |  | 11,084 |  |  | 2,486 |  |  | 24,035 |  |  | 1,758 |  |  | — |  |  | 19,465 |  |  | 58,828 |
Other (income) expense |  | (1,148) |  |  | 532 |  |  | 343 |  |  | 3,113 |  |  | 2 |  |  | (2,062) |  |  | 780 |
Income (loss) before income taxes |  | $ | 54,069 |  |  | $ | 21,436 |  |  | $ | (2,002) |  |  | $ | 13,960 |  |  | $ | 5,224 |  |  | $ | (66,324) |  |  | $ | 26,363 |
Other Non-cash Segment Disclosures:
Depreciation and intangible asset amortization (1) |  | 31,810 |  |  | 14,745 |  |  | 26,719 |  |  | 1,738 |  |  | 94 |  |  | 1,268 |  |  | 76,374 |
Amortization of debt discount & debt issuance costs (1) |  | 1,747 |  |  | 532 |  |  | 343 |  |  | 89 |  |  | — |  |  | 1,710 |  |  | 4,421 |
(1) These amounts disclosed by reportable segment are included within the other segment expense captions.

Nine Months Ended September, 2024
|  | North America Regions |  | U.S. Federal |  | Renewable Fuels |  | Europe |  | All Other |  | Corporate |  | Total
Revenues |  | $ | 638,027 |  |  | $ | 236,740 |  |  | $ | 122,248 |  |  | $ | 169,794 |  |  | $ | 70,452 |  |  |  |  | $ | 1,237,261 |
Cost of revenues |  | 554,840 |  |  | 196,671 |  |  | 93,813 |  |  | 155,893 |  |  | 46,743 |  |  |  |  | 1,047,960 |
Gross profit |  | 83,187 |  |  | 40,069 |  |  | 28,435 |  |  | 13,901 |  |  | 23,709 |  |  |  |  | 189,301 |
Add: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from unconsolidated entities |  | 38 |  |  | 686 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 724 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  | 37,676 |  |  | 9,294 |  |  | 1,742 |  |  | 12,170 |  |  | 15,750 |  |  | 49,288 |  |  | 125,920 |
(Gain) loss on derivatives |  | (1,045) |  |  | 316 |  |  | 462 |  |  | — |  |  | — |  |  | — |  |  | (267) |
Interest expense, net of interest income |  | 7,788 |  |  | 4,207 |  |  | 17,634 |  |  | 3,146 |  |  | — |  |  | 14,685 |  |  | 47,460 |
Other expense |  | 1,708 |  |  | 654 |  |  | 339 |  |  | 629 |  |  | 28 |  |  | 848 |  |  | 4,206 |
Income (loss) before income taxes |  | $ | 37,098 |  |  | $ | 26,284 |  |  | $ | 8,258 |  |  | $ | (2,044) |  |  | $ | 7,931 |  |  | $ | (64,821) |  |  | $ | 12,706 |
Other Non-cash Segment Disclosures:
Depreciation and intangible asset amortization (1) |  | 26,422 |  |  | 9,626 |  |  | 21,709 |  |  | 1,513 |  |  | 2,001 |  |  | 1,395 |  |  | 62,666 |
Amortization of debt discount & debt issuance costs (1) |  | 1,456 |  |  | 654 |  |  | 340 |  |  | — |  |  | — |  |  | 1,314 |  |  | 3,764 |
(1) These amounts disclosed by reportable segment are included within the other segment expense captions.

See Note 3 for additional information about our revenues by product line.
29

Table of Contents
AMERESCO, INC.
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(In thousands) (Unaudited) (Continued)
18. OTHER EXPENSES, NET
The following table presents the components of other expenses, net:

| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Loss (gain) on derivatives | $ | 813 |  |  | $ | 3,701 |  |  | $ | (2,154) |  |  | $ | (267) |
Amortization of debt discount and debt issuance costs | 1,572 |  |  | 1,442 |  |  | 4,421 |  |  | 3,764 |
Foreign currency transaction (gain) loss | 273 |  |  | (2,219) |  |  | (4,158) |  |  | (541) |
Other expense | 1,045 |  |  | 129 |  |  | 517 |  |  | 983 |
Other expenses, net | $ | 3,703 |  |  | $ | 3,053 |  |  | $ | (1,374) |  |  | $ | 3,939 |

19. ASSETS HELD FOR SALE
As of September 30, 2025, we determined that there were two energy asset projects under construction that were considered to be assets held for sale, since these assets were being marketed for sale and all the criteria to be classified as held for sale under ASC 360, Property, Plant and Equipment—Impairment or Disposal of Long-Lived Assets, had been met. Assets held for sale are measured at the lower of their carrying value or the fair value less cost to sell. The carrying value of these assets was $401, with no liabilities directly associated with assets classified as held for sale as of September 30, 2025. As of December 31, 2024 there were three energy assets held for sale with a carrying value of $8,372 with liabilities directly associated of $771.
Assets held for sale are measured at the lower of their carrying value or the fair value less cost to sell.
30

Table of Contents
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations
You should read the following discussion and analysis of our financial condition and results of operations together with our unaudited condensed consolidated financial statements and the notes related thereto included in Part I, Item 1 of this Quarterly Report on Form 10-Q and the audited consolidated financial statements and notes thereto and management’s discussion and analysis of financial condition and results of operations for the year ended December 31, 2024 included in our Annual Report on Form 10-K (“2024 Form 10-K”) for the year ended December 31, 2024 filed on February 28, 2025 with the U.S. Securities and Exchange Commission (“SEC”). This Quarterly Report on Form 10-Q contains “forward-looking statements” within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Forward looking statements include statements regarding our strategy, future operations, future financial position, future revenues, projected costs, prospects, plans, objectives of management, expected market growth, the impact of changes in the U.S. administration and the federal shutdown and other characterizations of future events or circumstances. All statements, other than statements of historical fact, including statements that refer to our expectations as to the future growth of our business and associated expenses; our expectations as to revenue generation; the future availability of borrowings under our revolving credit facility; the expected future growth of the market for energy efficiency and renewable energy solutions; our backlog, awarded projects and recurring revenue and the timing of such matters; our expectations as to financing and acquisition activity; the impact of any restructuring; the uses of future earnings; the expected energy and cost savings of our projects; the expected energy production capacity of our renewable energy plants; the impact of supply chain disruptions, shortage and cost of materials and labor, the impact of U.S. federal shutdowns and other macroeconomic and geopolitical challenges; our expectations related to our agreement with SCE including the impact of any delays; the imposition of tariffs, and other characterizations of future events or circumstances are forward-looking statements. Forward looking statements are often, but not exclusively, identified by the use of words such as “may,” “will,” “expect,” “believe,” “anticipate,” “intend,” “could,” “estimate,” “target,” “project,” “predict” or “continue,” and similar expressions or variations. These forward-looking statements are based on current expectations and assumptions that are subject to risks, uncertainties and other factors that could cause actual results and the timing of certain events to differ materially and adversely from future results expressed or implied by such forward-looking statements. Risks, uncertainties, and factors that could cause or contribute to such differences include, but are not limited to, those discussed in the section titled “Risk Factors,” set forth in Part I, Item 1A of our 2024 Form 10-K. Subsequent events and developments may cause our views to change. However, while we may elect to update these forward-looking statements at some point in the future, we have no current intention of doing so and undertake no obligation to do so except to the extent required by applicable law. You should, therefore, not rely on these forward-looking statements as representing our views as of any date subsequent to the date of this Quarterly Report on Form 10-Q.
Overview
Ameresco is a leading energy solutions provider dedicated to helping customers navigate the energy transition. Our comprehensive portfolio includes implementing smart energy efficiency solutions, upgrading aging infrastructure, and developing, constructing, and operating distributed energy resources.
Drawing from decades of experience, Ameresco reduces energy use and delivers diversified generation solutions to Federal, state and local governments, utilities, educational and healthcare institutions, housing authorities, and commercial and industrial customers.
We provide solutions primarily throughout North America and Europe, and our revenues are derived principally from energy efficiency projects, which entail the design, engineering, and installation of equipment and other measures that incorporate a range of innovative technology and techniques to improve the efficiency and control the operation of a facility’s energy infrastructure; this can include designing and constructing a central plant or cogeneration system for a customer providing power, heat and/or cooling to a building, or other small-scale plant that produces electricity, gas, heat or cooling from renewable sources of energy. We also derive revenue from long-term O&M contracts, energy supply contracts for renewable energy operating assets that we own, integrated-PV, and consulting and enterprise energy management services.
In addition to organic growth, strategic acquisitions of complementary businesses and assets, and joint venture arrangements have been an important part of our growth enabling us to broaden our service offerings and expand our geographical reach.
Key Factors and Trends
Regulatory Environment and Federal Policies
Federal policies play an important role in our business and we benefit from regulatory measures and various clean energy tax incentives, including those implemented under the Inflation Reduction Act (the “IRA”). These credits were modified by the One Big Beautiful Bill Act (the “OBBB”), which was enacted on July 4, 2025.
31

Table of Contents
Among other provisions, the OBBB introduces new timing requirements for solar-only projects seeking eligibility for Investment Tax Credits (the “ITC”) under Section 48 of the Internal Revenue Code (the “Code”). To qualify, such projects must commence construction by July 4, 2026, and be placed in service by December 31, 2027. The OBBB also phases down ITCs for energy storage projects beginning in 2034, with a complete phase-out by 2036. Additionally, it increases the requirements for the domestic content bonus credit and introduces new compliance obligations under the Foreign Entity of Concern (“FEOC”) provisions for solar and energy storage projects beginning construction in 2026.
These legislative and regulatory developments may adversely impact our eligibility for certain tax credits, the attractiveness of our solar and energy storage system offerings, and overall demand for our products. If we are unable to meet the revised domestic content or FEOC requirements, our ability to qualify for these incentives could be impaired, which may adversely affect our revenue, gross margins, business operations and competitive position.
On October 1, 2025, the U.S. government shut down due to the failure of the U.S. Congress to pass an appropriations bill, or any continuing resolutions to maintain funding at existing levels, for the U.S. government’s current fiscal year. While we have not experienced a notable slowdown in our government work even with the shutdown, a prolonged government shutdown could delay our ability to convert project awards into contracts and as such could have an adverse impact on our financial results. We continue to monitor the impacts of this shut down. The government shutdown has also delayed the government providing guidance regarding the “beginning of construction” criteria applicable to clean energy projects and final FEOC restrictions under the OBBB Act.
See “Our business depends in part on federal, state, provincial and local government support or the imposition of additional taxes, tariffs, duties, or other assessments on renewable energy or the equipment necessary to generate or deliver it, for energy efficiency and renewable energy, and a decline in such support could harm our business” and “Compliance with environmental laws could adversely affect our operating results” in Item 1A, Risk Factors in our 2024 Form 10-K.
Supply Chain Disruptions and Other Global Factors
We continue to monitor the impact of global economic conditions on our operations, financial results, and liquidity, such as the impact of tariffs, supply chain challenges, the wars in Ukraine and the Middle East, evolving relations between the U.S. and China, and other geopolitical tensions. Import duties, tariffs and other import restrictions, including the Uyghur Forced Labor Protection Act, restrict the global supply of, and raise prices for, supplies needed for our business. In addition, tariffs and trade restrictions that have been introduced and may be introduced as part of the 'America First' trade policy may further increase the cost of components needed for our offerings and may strain trade relations, create inflationary pressures and cause additional supply chain disruptions. The impact to our future operations and results of operations as a result of these global trends remains uncertain and the challenges we face, including increases in costs for logistics and supply chains, intermittent supplier delays, and shortages of certain components needed for our business, such as electrical equipment, steel and aluminum as well as BESS equipment or components required for our projects and clean energy solutions may continue or become more pronounced.
These tariffs, restrictions, and strained trade relations may affect our ability to source materials and products, potentially leading to increased costs, supply chain disruptions and operational challenges, and decreased demand for our offerings. We are closely monitoring the regulatory environment and actions of the current administration that could impact our business.
During the nine months ended September 30, 2025, we continued to face supply chain disruptions and varying levels of inflation driven by macroeconomic conditions. This caused some delays in the timely delivery of material to customer sites and in the timely completion of certain projects and increased shipping, transportation, component and labor costs, negatively impacting our results of operations during the nine months ended September 30, 2025. We expect these challenges will persist and they may intensify. We continue to monitor macroeconomic conditions to remain flexible and to optimize and evolve our business as appropriate to address the challenges presented from these conditions.
We believe the increasing demand for electricity, rising utility rates, and growing grid instability, are driving demand for our energy infrastructure and other solutions. This increased demand may increase the competition we face and we may also face an increased risk in completing larger more complex projects.
Climate Change and Effects of Seasonality
Global emphasis on climate change and reducing carbon emissions has created opportunities for our industry. Sustainability has been at the forefront of our business since its inception, and we are committed to staying at the leading edge of innovation taking place in the energy sector. We believe the next decade will be marked by dramatic changes in the power infrastructure with resources shifting to more distributed assets, storage, and microgrids to increase overall reliability and resiliency.
32

Table of Contents
Climate change also brings risks, as the impacts have caused us to experience more frequent and severe weather interferences, and this trend is expected to continue. We are subject to seasonal fluctuations and construction cycles, particularly in climates that experience colder weather during the winter months, such as the northern United States and Canada, and climates that experience extreme weather events, such as wildfires, storms or flooding, hurricanes, or at educational institutions, where large projects are typically carried out during summer months when their facilities are unoccupied. In addition, government customers, many of which have fiscal years that do not coincide with ours, typically follow annual procurement cycles and appropriate funds on a fiscal-year basis even though contract performance may take more than one year. Further, government contracting cycles can be affected by the timing of, and delays in, the legislative process related to government programs and incentives that help drive demand for energy efficiency and renewable energy projects. As a result, our revenues and operating income in the third and fourth quarter are typically higher, and our revenues and operating income in the first quarter are typically lower, than in other quarters of the year, however, this may become harder to predict with the potential effects of climate change. As a result of such fluctuations, we may occasionally experience declines in revenues or earnings as compared to the immediately preceding quarter, and comparisons of our operating results on a period-to-period basis may not be meaningful.
Our annual and quarterly financial results are also subject to significant fluctuations as a result of other factors, many of which are outside our control. See “Our business is affected by seasonal trends and construction cycles, and these trends and cycles could have an adverse effect on our operating results” and “Extreme weather events and other natural disasters, particularly those exacerbated by climate change, could materially affect our ability to complete our projects and develop our assets” in Item 1A, Risk Factors in our 2024 Form 10-K.
The Southern California Edison (“SCE”) Agreement
In October 2021, we entered into a contract with SCE to design and build three grid scale BESS at three sites near existing substation parcels throughout SCE’s service territory in California with an aggregate capacity of 537.5 MW (the “SCE Agreement”). The engineering, procurement and construction price is approximately $892.0 million in the aggregate, including two years of O&M revenues, subject to customary potential adjustments for changes in the work. As previously disclosed, due to supply chain delays, weather and other events, we were unable to complete the projects by August 1, 2022 (the “Guaranteed Completion Date”). On August 30, 2024, we reached an agreement with SCE on the substantial completion of two out of three battery energy storage system projects. We received approximately $110 million on September 5, 2024 as milestone payments, reflecting both an offset of liquidated damages which are still in dispute and $3 million that SCE withheld for additional work SCE required. Upon final acceptance of these two projects, we will invoice SCE for the remaining final acceptance milestone payments for these projects. We have provided SCE notice for substantial completion of the third project and are in discussions with SCE to reach agreement on the achievement of this milestone. We continue to expect all three projects to be finalized this year.
The August 2024 agreement with SCE confirmed that the final resolution related to our obligation to pay the liquidated damages withheld and the applicability and scope of any force majeure relief as well as any cost recovery we may be entitled to remain subject to dispute. We are continuing discussions with SCE on these matters, and our view continues to be that liquidated damages should not be applied. If we fail to come to an agreement with SCE about the applicability and scope of force majeure relief and liquidated damages, we may be required to pay liquidated damages up to an aggregate maximum of $89 million and may not be able to recover costs associated with the force majeure events.
A majority of our revenues under this contract were recognized in 2022 based upon costs incurred in 2022 relative to total expected costs on this project.
Stock-based Compensation
During the nine months ended September 30, 2025, we granted 1,416,000 common stock options and 136,770 restricted stock units (“RSUs”) to certain employees under our 2020 Plan. Our unrecognized stock-based compensation expense was $23.9 million at September 30, 2025, compared to $28.0 million at December 31, 2024, and is expected to be recognized over a weighted-average period of three years. See Note 16 “Stock-based Compensation” for additional information.
Backlog and Awarded Projects
Backlog is an important metric for us because we believe strong order backlogs indicate growing demand and a healthy business over the medium to long term, conversely, a declining backlog could imply lower demand.
33

Table of Contents
The following table presents our backlog:

| As of September 30,
(In Thousands) | 2025 |  | 2024
Project Backlog |  |  |
Fully-contracted backlog | $ | 2,473,089 |  |  | $ | 1,852,774 |
Awarded, not yet signed customer contracts | 2,668,102 |  |  | 2,656,082 |
Total project backlog | $ | 5,141,191 |  |  | $ | 4,508,856 |
12-month project backlog | $ | 1,248,697 |  |  | $ | 976,530 |
O&M Backlog |  |  |
Fully-contracted backlog | $ | 1,476,035 |  |  | $ | 1,421,204 |
12-month O&M backlog | $ | 103,158 |  |  | $ | 91,380 |

Total project backlog represents energy efficiency projects that are active within our sales cycle. Our sales cycle begins with the initial contact with the customer and ends, when successful, with a signed contract, also referred to as fully-contracted backlog. Our sales cycle averages 18 to 42 months. Awarded backlog is created when a potential customer awards a project to Ameresco following a request for proposal. Once a project is awarded but not yet contracted, we typically conduct a detailed energy audit to determine the scope of the project as well as identify the savings that may be expected to be generated from upgrading the customer’s energy infrastructure. At this point, we also determine the subcontractors, what equipment will be used, and assist in arranging for third party financing, as applicable. It takes an average of 12 to 24 months to convert our awarded backlog to fully-contracted backlog. It may take longer, as it depends on the size and complexity of the project. Historically, approximately 90% of our awarded backlog projects have resulted in a signed contract. After the customer and Ameresco agree to the terms of the contract and the contract is executed, the project moves to fully-contracted backlog. The contracts reflected in our fully-contracted backlog typically have a construction period of 12 to 36 months and we typically expect to recognize revenue for such contracts over the same period.
Our O&M backlog represents expected future revenues under signed, multi-year customer contracts for the delivery of O&M services, primarily for energy efficiency and renewable energy construction projects completed by us for our customers.
We define our 12-month backlog as the estimated amount of revenue that we expect to recognize in the next twelve months from our fully-contracted backlog. See “We may not recognize all revenues from our backlog or receive all payments anticipated under awarded projects and customer contracts” and “In order to secure contracts for new projects, we typically face a long and variable selling cycle that requires significant resource commitments and requires a long lead time before we realize revenues” in Item 1A, Risk Factors in our 2024 Form 10-K.
Assets in Development
Assets in development, which represents the potential design/build project value of renewable energy plants that have been awarded or for which we have secured development rights, were estimated at $2.2 billion and $2.3 billion, net of amount attributable to a non-controlling interest at September 30, 2025 and 2024, respectively. This is another important metric because it helps us gauge our future capital expenditure needs and develop-and-sell opportunities as well as our capacity to generate electricity or deliver renewable gas fuel, which contributes to our recurring revenue stream.
34

Table of Contents
Results of Operations
All financial result comparisons made below are against the same prior year period unless otherwise noted.
The following tables set forth certain financial data from the condensed consolidated statements of income for the periods indicated:

| Three Months Ended September 30,
| 2025 |  | 2024 |  | Year-Over-Year Change
(In Thousands) | Amount |  | % of Revenues |  | Amount |  | % of Revenues |  | Dollar Change |  | % Change
Revenues | $ | 525,987 |  |  | 100.0 | % |  | $ | 500,873 |  |  | 100.0 | % |  | $ | 25,114 |  |  | 5.0 | %
Cost of revenues | 441,658 |  |  | 84.0 | % |  | 423,734 |  |  | 84.6 | % |  | 17,924 |  |  | 4.2 | %
Gross profit | 84,329 |  |  | 16.0 | % |  | 77,139 |  |  | 15.4 | % |  | 7,190 |  |  | 9.3 | %
Earnings from unconsolidated entities | 1,393 |  |  | 0.3 | % |  | 159 |  |  | — | % |  | 1,234 |  |  | 776.1 | %
Selling, general and administrative expenses | 43,372 |  |  | 8.2 | % |  | 42,139 |  |  | 8.4 | % |  | 1,233 |  |  | 2.9 | %
Operating income | 42,350 |  |  | 8.1 | % |  | 35,159 |  |  | 7.0 | % |  | 7,191 |  |  | 20.5 | %
Other expenses, net | 24,188 |  |  | 4.6 | % |  | 21,469 |  |  | 4.3 | % |  | 2,719 |  |  | 12.7 | %
Income before income taxes | 18,162 |  |  | 3.5 | % |  | 13,690 |  |  | 2.7 | % |  | 4,472 |  |  | 32.7 | %
Income tax benefit | (3,678) |  |  | (0.7) | % |  | (3,324) |  |  | (0.7) | % |  | 354 |  |  | 10.6 | %
Net income | 21,840 |  |  | 4.2 | % |  | 17,014 |  |  | 3.4 | % |  | 4,826 |  |  | 28.4 | %
Net (income) loss attributable to non-controlling interests and redeemable non-controlling interests | (3,308) |  |  | (0.6) | % |  | 585 |  |  | 0.1 | % |  | (3,893) |  |  | (665.5) | %
Net income attributable to common shareholders | $ | 18,532 |  |  | 3.5 | % |  | $ | 17,599 |  |  | 3.5 | % |  | $ | 933 |  |  | 5.3 | %

Our results of operations for the three months ended September 30, 2025 are due to the following:
•Revenues: total revenues for the three months ended September 30, 2025 increased over 2024 primarily due to a $24.6 million, or 6%, increase in our project revenues attributed to the timing of revenue recognized based upon costs incurred to date relative to total expected costs on active projects, and a $3.4 million, or 6% increase in energy asset revenue resulting from the continued growth of our operating portfolio.
•Cost of Revenues and Gross Profit: the increase in cost of revenues is primarily due to the increase in project revenues described above and higher depreciation expenses from the continued growth in our operating assets portfolio. Gross profit as a percentage of revenues increased primarily due to a more favorable mix of higher-margin projects.
•Selling, General and Administrative Expenses (“SG&A”): SG&A expenses for the three months ended September 30, 2025 increased from 2024 primarily due to increases in professional fees and payroll and related benefits, partially offset by lower project development, travel and insurance expenses.
•Other Expenses, Net: Other expenses, net for the three months ended September 30, 2025 increased over 2024 primarily due to increase in loss from foreign currency transactions of $0.3 million compared to gains of $2.2 million last year and higher net interest expenses of $2.1 million related to an increase in the amount of energy asset financings and corporate debt outstanding and higher interest rates partially offset by decrease in losses from derivatives transactions of $2.9 million.
•Income Tax Benefit: the benefit for income taxes is based on various rates set by federal, state, provincial and local authorities and is affected by differences between financial accounting and tax reporting requirements. We expect the effective tax rate benefit will be lower in 2025 as compared to 2024 primarily due to the effects of lower Section 179D Energy Efficient Building deductions and effects of foreign earnings, offset by higher investment tax credits from solar, and storage plants placed into service or are forecasted to be placed into service during 2025.
•Net Earnings Per Share: Net income increased due to the reasons described above. Basic and diluted earnings per share for the three months ended September 30, 2025 were $0.35, an increase of $0.01 per share basic and $0.02 diluted compared to the same period of 2024.
35

Table of Contents

| Nine Months Ended September 30,
| 2025 |  | 2024 |  | Year-Over-Year Change
(In Thousands) | Amount |  | % of Revenues |  | Amount |  | % of Revenues |  | Dollar Change |  | % Change
Revenues | $ | 1,351,100 |  |  | 100.0 | % |  | $ | 1,237,261 |  |  | 100.0 | % |  | $ | 113,839 |  |  | 9.2 | %
Cost of revenues | 1,141,494 |  |  | 84.5 | % |  | 1,047,960 |  |  | 84.7 | % |  | 93,534 |  |  | 8.9 | %
Gross profit | 209,606 |  |  | 15.5 | % |  | 189,301 |  |  | 15.3 | % |  | 20,305 |  |  | 10.7 | %
Earnings from unconsolidated entities | 1,804 |  |  | 0.1 | % |  | 724 |  |  | 0.1 | % |  | 1,080 |  |  | 149.2 | %
Selling, general and administrative expenses | 127,593 |  |  | 9.4 | % |  | 125,920 |  |  | 10.2 | % |  | 1,673 |  |  | 1.3 | %
Operating income | 83,817 |  |  | 6.2 | % |  | 64,105 |  |  | 5.2 | % |  | 19,712 |  |  | 30.7 | %
Other expenses, net | 57,454 |  |  | 4.3 | % |  | 51,399 |  |  | 4.2 | % |  | 6,055 |  |  | 11.8 | %
Income before income taxes | 26,363 |  |  | 2.0 | % |  | 12,706 |  |  | 1.0 | % |  | 13,657 |  |  | 107.5 | %
Income tax benefit | (5,390) |  |  | (0.4) | % |  | (3,324) |  |  | (0.3) | % |  | 2,066 |  |  | 62.2 | %
Net income | 31,753 |  |  | 2.4 | % |  | 16,030 |  |  | 1.3 | % |  | 15,723 |  |  | 98.1 | %
Net (income) loss attributable to non-controlling interests and redeemable non-controlling interests | (5,839) |  |  | (0.4) | % |  | 3,642 |  |  | 0.3 | % |  | (9,481) |  |  | (260.3) | %
Net income attributable to common shareholders | $ | 25,914 |  |  | 1.9 | % |  | $ | 19,672 |  |  | 1.6 | % |  | $ | 6,242 |  |  | 31.7 | %

Our results of operations for the nine months ended September 30, 2025 are due to the following:
•Revenues: total revenues for the nine months ended September 30, 2025 increased over 2024 primarily due to a $99.1 million, or 11%, increase in our project revenues attributed to the timing of revenue recognized based upon costs incurred to date relative to total expected costs on active projects, and a $26.4 million, or 17% increase in energy asset revenue resulting from the continued growth of our operating portfolio.
•Cost of Revenues and Gross Profit: the increase in cost of revenues is primarily due to the increase in project revenues described above and higher depreciation expenses from the continued growth in our operating assets portfolio. Gross profit as a percentage of revenues remained consistent.
•SG&A: SG&A expenses for the nine months ended September 30, 2025 remained consistent compared to the prior year.
•Other Expenses, Net: Other expenses, net for the nine months ended September 30, 2025 increased over 2024 primarily due to higher interest expenses, net of $11.4 million related to an increase in the amount of energy asset financings and corporate debt outstanding and higher interest rates, partially offset by increased gains from foreign currency transactions of $3.6 million compared to last year.
•Income Tax Benefit: the benefit for income taxes is based on various rates set by federal, state, provincial and local authorities and is affected by differences between financial accounting and tax reporting requirements. We expect the effective tax rate benefit will be lower in 2025 as compared to 2024 primarily due to the effects of lower Section 179D Energy Efficient Building deductions and effects of foreign earnings, offset by higher investment tax credits from solar, and storage plants placed into service or are forecasted to be placed into service during 2025.
•Net Earnings Per Share: Net income increased due to the reasons described above. Basic and diluted earnings per share for the nine months ended September 30, 2025 were $0.49, an increase of $0.12 per share compared to the same period of 2024.
Business Segment Analysis
Our reportable segments three and nine months ended September 30, 2025 are North America Regions, U.S. Federal, Europe, Renewable Fuels, and All Other. These segments do not include results of other activities, such as corporate operating expenses not specifically allocated to the segments. See Note 17 “Business Segment Information” for additional information about our segments.
All financial result comparisons made below relate to the three and nine-month period and are against the same prior year period unless otherwise noted.
36

Table of Contents
Revenues

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In Thousands) | 2025 |  | 2024 |  | Dollar Change |  | % Change |  | 2025 |  | 2024 |  | Dollar Change |  | % Change
North America Regions | $ | 237,600 |  |  | $ | 291,611 |  |  | $ | (54,011) |  |  | (18.5) | % |  | $ | 627,045 |  |  | $ | 638,027 |  |  | $ | (10,982) |  |  | (1.7) | %
U.S. Federal | 89,508 |  |  | 89,113 |  |  | 395 |  |  | 0.4 |  |  | 174,399 |  |  | 236,740 |  |  | (62,341) |  |  | (26.3) |
Renewable Fuels | 37,674 |  |  | 43,537 |  |  | (5,863) |  |  | (13.5) |  |  | 118,668 |  |  | 122,248 |  |  | (3,580) |  |  | (2.9) |
Europe | 144,234 |  |  | 52,613 |  |  | 91,621 |  |  | 174.1 |  |  | 382,775 |  |  | 169,794 |  |  | 212,981 |  |  | 125.4 |
All Other | 16,971 |  |  | 23,999 |  |  | (7,028) |  |  | (29.3) |  |  | 48,213 |  |  | 70,452 |  |  | (22,239) |  |  | (31.6) |
Total revenues | $ | 525,987 |  |  | $ | 500,873 |  |  | $ | 25,114 |  |  | 5.0 | % |  | $ | 1,351,100 |  |  | $ | 1,237,261 |  |  | $ | 113,839 |  |  | 9.2 | %

•North America Regions: revenues decreased versus the prior year primarily due to lower project revenue attributed to the timing of revenue recognized based upon costs incurred to date relative to total expected costs on active projects, partially offset by increased energy assets revenue resulting from the continued growth of our operating portfolio, higher O&M and consulting revenue.
•U.S. Federal: the increase in revenue during the three months ended September 30, 2025 is primarily due to increased energy assets revenue resulting from the continued growth of our operating portfolio, partially offset by lower project revenue attributed to the timing of revenue recognized based upon costs incurred to date relative to total expected costs on active projects. The decrease in revenue during the nine months ended September 30, 2025 is primarily due to lower project revenue attributed to the timing of revenue recognized based upon costs incurred to date relative to total expected costs on active projects and the reversal of previously recognized revenue as it was determined that the closing of a sale of a solar photovoltaic energy project was no longer probable, partially offset by increased energy assets revenue resulting from the continued growth of our operating portfolio.
•Renewable Fuels: revenues decreased during the three months ended September 30, 2025 primarily due to decreased project revenues resulting from the timing of revenue recognized based upon costs incurred to date relative to total expected costs. The decreased revenues during the nine months ended September 30, 2025 is primarily due to lower project revenue partially offset by an increase in energy asset revenues resulting from the continued growth of our operating portfolio and increased production levels.
•Europe: revenues increased primarily due to higher project revenues resulting from the timing of revenue recognized based upon costs incurred to date relative to total expected costs on active projects primarily related to increased activity under our joint ventures in Greece and Romania compared to the prior period.
•All Other: All other revenues decreased year-over-year primarily due to the divestiture of an energy technology and advisory services company in the fourth quarter of 2024.
Income (Loss) before Taxes and Unallocated Corporate Activity

| Three Months Ended September 30, |  | Nine Months Ended September 30,
(In Thousands) | 2025 |  | 2024 |  | Dollar Change |  | % Change |  | 2025 |  | 2024 |  | Dollar Change |  | % Change
North America Regions | $ | 24,824 |  |  | $ | 22,662 |  |  | $ | 2,162 |  |  | 9.5 | % |  | $ | 54,069 |  |  | $ | 37,098 |  |  | $ | 16,971 |  |  | 45.7 | %
U.S. Federal | 12,857 |  |  | 9,543 |  |  | 3,314 |  |  | 34.7 |  |  | 21,436 |  |  | 26,284 |  |  | (4,848) |  |  | (18.4) |
Renewable Fuels | 835 |  |  | 2,236 |  |  | (1,401) |  |  | (62.7) |  |  | (2,002) |  |  | 8,258 |  |  | (10,260) |  |  | (124.2) |
Europe | 3,543 |  |  | (3,285) |  |  | 6,828 |  |  | 207.9 |  |  | 13,960 |  |  | (2,044) |  |  | 16,004 |  |  | 783.0 |
All Other | 1,687 |  |  | 2,580 |  |  | (893) |  |  | (34.6) |  |  | 5,224 |  |  | 7,931 |  |  | (2,707) |  |  | (34.1) |
Unallocated corporate activity | (25,584) |  |  | (20,046) |  |  | (5,538) |  |  | (27.6) |  |  | (66,324) |  |  | (64,821) |  |  | (1,503) |  |  | (2.3) |
Income before taxes | $ | 18,162 |  |  | $ | 13,690 |  |  | $ | 4,472 |  |  | 32.7 | % |  | $ | 26,363 |  |  | $ | 12,706 |  |  | $ | 13,657 |  |  | (107.5) | %

•North America Regions: the increase is primarily from our energy asset operations, resulting from the continued growth of our operating portfolio.
•U.S. Federal: the increase during the three months ended September 30, 2025 is primarily due to higher earnings from unconsolidated entities and lower net interest compared to the prior period. The decrease during the nine months ended September 30, 2025 is primarily due to the lower revenues noted above, partially offset by lower net interest compared to the prior period.
•Renewable Fuels: the decrease is primarily due to higher interest expenses and increased depreciation expense.
37

Table of Contents
•Europe: the increase is primarily due to the increased revenues noted above, partially offset by higher SG&A expenses.
•All Other: the decrease is primarily due to the divestiture of an energy technology and advisory services company in the fourth quarter of 2024.
•Unallocated corporate activity includes all corporate level selling, general and administrative expenses and other expenses not allocated to the segments. We do not allocate any indirect expenses to the segments. Corporate activity during the three months ended September 30, 2025 increased primarily due to higher interest expense and foreign currency transaction losses this year versus gains last year. During the nine months ended September 30, 2025 corporate activity increased primarily due to higher interest expense offset by higher foreign currency transaction gains this year and an additional gain of $1.4 million recognized in 2025 from the sale of an energy technology and advisory services company late in 2024.
Liquidity and Capital Resources
Overview
Since inception, we have funded operations primarily through cash flow from operations, advances from Federal ESPC projects, our senior secured credit facility, second lien term loan and various forms of other debt. See Note 8 “Debt and Financing Lease Liabilities” for additional information.
Working capital requirements can be susceptible to fluctuations during the year due to timing differences between costs incurred, the timing of milestone-based customer invoices and actual cash collections. Working capital may also be affected by seasonality, growth rate of revenue, long lead-time equipment purchase patterns, advances from Federal ESPC projects, and payment terms for payables relative to customer receivables.
We expect to incur additional expenditures in connection with the following activities:
•equity investments, project asset acquisitions, and business acquisitions that we may fund from time to time
•capital investment in current and future energy assets
•material, equipment, and other expenditures for large projects
We regularly monitor and assess our ability to meet funding requirements. We believe that cash and cash equivalents, working capital and availability under our revolving senior secured credit facility, combined with our right (subject to lender consent) to increase our revolving credit facility by $100.0 million, plus develop and sell asset transactions, sales of tax attributes, and our general access to credit and equity markets, will be sufficient to fund our operations through at least November 2026 and thereafter.
We continue to evaluate and take action, as necessary, to preserve adequate liquidity and ensure that our business can continue to operate and that we can meet our capital and debt service requirements. This may include limiting discretionary spending across the organization and re-prioritizing our capital projects amid times of political unrest, the duration of supply challenges, and the rate and duration of the inflationary pressures, and other events affecting our liquidity. For example, recent increases in inflation and interest rates have impacted overall market returns on assets. We have therefore been particularly prudent in our capital commitments over the past few quarters, ensuring that our assets in development continue to align with our hurdle rates.
Senior Secured Corporate Credit Facility
On January 23, 2025, we refinanced our term loan and revolving credit facility by enteri ng into a sixth amended and restated senior secured credit agreement (“Restated Credit Agreement”) with the group of lenders thereto. The interest rate for borrowings is based on, at our option, either the Base Rate plus a margin of 0.75% to 1.75%, depending on our core leverage ratio; or the Term SOFR plus a margin of 1.75% to 2.75%, depending on our core leverage ratio. A commitment fee of between 0.25% and 0.375%, depending on our core leverage ratio, is payable quarterly on the undrawn portion of the revolver. At closing we paid $2.3 million in lenders fees and debt issuance costs. Proceeds from this agreement in the amount of $180.0 million and $13.0 million were used to pay the balance of our revolving credit facility and the outstanding portion of the senior secured term loan, respectively, at closing. As of September 30, 2025, the interest rates were 7.06% and 7.71% per annum for the term loan and revolving credit facility, respectively.
The Restated Credit Agreement replaced and extended the prior credit agreement dated March 4, 2022, and subsequently amended (the “Original Credit Agreement”). The Restated Credit Agreement refinanced the credit facilities under the Original Credit Agreement and replaced it with the following facilities:
•a $225.0 million revolving credit facility, maturing on December 28, 2028, and
•a $100.0 million term loan, maturing on December 28, 2028.
38

Table of Contents
The revolver may be increased by up to an additional $100.0 million at our option if lenders are willing to provide such increased commitments, subject to certain conditions.
As of September 30, 2025, the balance on the senior secured term loans was $96.3 million, the balance on the senior secured revolving credit facility was $110.0 million, and we had funds available of $26.6 million.
Energy Asset Financing
Energy Asset Construction Facilities, Financing Facilities, and Term Loans
We have entered into a number of construction and term loan agreements for the purpose of constructing and owning certain renewable energy plants. The physical assets and the operating agreements related to the renewable energy plants are generally owned by wholly owned, single member “special purpose” subsidiaries of Ameresco. These construction and term loans are structured as project financings made directly to a subsidiary, and upon commercial operation and achieving certain milestones in the credit agreement, the related construction loan converts into a term loan. While we are required under generally accepted accounting principles (“GAAP”) to reflect these loans as liabilities on our condensed consolidated balance sheets, they are generally non-recourse and not direct obligations of Ameresco, Inc., except to the extent of completion guarantees and EPC contracts and certain equity contribution obligations under our August 2023 Construction Credit Facility.
Our project financing facilities contain various financial and other covenant requirements which include debt service coverage ratios and total funded debt to EBITDA, as defined in the facilities. Any failure to comply with the financial or other covenants of our project financings would result in inability to distribute funds from the wholly-owned subsidiary to Ameresco, Inc. or constitute an event of default in which the lenders may have the ability to accelerate the amounts outstanding, including all accrued interest and unpaid fees.
On April 30, 2025 we entered into a note purchase agreement and private shelf agreement which includes committed proceeds under series A notes of $78.0 million to finance a battery energy storage asset in development, with a maturity date of September 30, 2045, and a fixed interest rate of 6.72% per annum. Gross proceeds from the initial issuance on April 30, 2025 were $67.7 million and the remaining balance of $10.3 million was issued on June 27, 2025. The agreement also includes a 20-year term $300.0 million private shelf facility as well as the ability to issue series B notes on or before December 31, 2025. As part of this transaction, we signed a tax credit transfer agreement for the investment tax credits associated with the BESS asset. Upon the asset achieving commercial operations, we will receive payment for the ITC transfer and a $30.0 million prepayment on the note purchase agreement will be required.
On May 27, 2025 we entered into an omnibus amendment a s part of a tax credit transfer agreement for investment tax credits. The agreement required a $7,000 principal payment, which was made during the nine months ended September 30, 2025. On September 26, 2025 we entered into an amendment to modify the May 27, 2025 omnibus amendment. The amendment included advances of $25,500 related to an expansion project and $15,653 related to a true-up payment in connection to the removal of an IRR residual income requirement. Prior to this amendment, the loan bore interest at a rate of 6.70% with a residual percentage of distributable cash flows payable after the maturity date of the loan, until the earlier of the lender achieving an 8.51% internal rate of return (“IRR”) on funds borrowed under the facility, or the facility discharge date. The interest rate is now fixed at 8.75% and the maturity date changed from August 31, 2039 to September 26, 2040. At September 30, 2025, $348,182 was outstanding under this facility, net of unamortized debt discount and issuance costs.
During the nine months ended September 30, 2025, we drew an additional $171.4 million, paid down $75.3 million, and at September 30, 2025, $408.5 million was outstanding under our August 2023 Construction Credit Facility, net of unamortized debt discount and issuance costs. The Powin bankruptcy triggered a default under this facility, requiring us to move the project associated with the battery payment deposits we made to Powin out of this facility. There were other administrative errors which resulted in defaults under this facility. We received the appropriate waivers for these defaults. In addition, we received a waiver to temporarily increase our maximum commitment of $400,000 to $415,000 until November 30, 2025.
On October 31, 2025 we entered into a note purchase agreement and private shelf agreement which includes committed proceeds under series A notes and second lien notes of $34,356 and $15,129, with maturity dates of December 31, 2043 and September 30, 2040, and fixed interest rates of 5.71% and 7.40% per annum, respectively. At closing, we incurred $763 in lenders fees and debt issuance costs. The agreement also includes a 20-year term $80,000 private shelf facility.
39

Table of Contents
We also paid off our October 2012, Term Loan in the amount of $31.1 million, partially with $8.3 million in proceeds from our new $12.2 million May 2025, Term Loan and the remainder from working capital.
Other Financing Facilities and Financing Leases
During the nine months ended September 30, 2025, we sold and leased back eight energy assets for $28.6 million in cash proceeds under our August 2018 Master Sale-leaseback. During the nine months ended September 30, 2025, we were in default of certain lien provisions of this agreement. On June 30, 2025, we received a waiver of this default which is valid until December 31, 2025.
Federal ESPC Liabilities
We have arrangements with certain third-parties to provide advances to us during the construction or installation of projects for certain customers, typically federal governmental entities, in exchange for our assignment to the lenders of our rights to the long-term receivables arising from the ESPCs related to such projects. These financings totaled $499.1 million as of September 30, 2025. Under the terms of these financing arrangements, we are required to complete the construction or installation of the project in accordance with the contract with our customer, and the liability remains on our condensed consolidated balance sheets until the completed project is accepted by the customer.
We are the primary obligor for financing received, but only until final acceptance of the work by the customer. At this point recourse to us ceases and the ESPC receivables are transferred to the investor. The transfers of receivables under these agreements do not qualify for sales accounting until final customer acceptance of the work, so the advances from the investors are not classified as operating cash flows. Cash draws that we received under these ESPC agreements were $82.0 million during the nine months ended September 30, 2025, and are recorded as financing cash inflows. The use of the cash received under these arrangements is to pay project costs classified as operating cash flows and totaled $59.7 million during the nine months ended September 30, 2025. Due to the manner in which the ESPC contracts with the third-party investors are structured, our reported operating cash flows are materially impacted by the fact that operating cash flows only reflect the ESPC contract expenditure outflows and do not reflect any inflows from the corresponding contract revenues. Upon acceptance of the project by the federal customer the ESPC receivable and corresponding ESPC liability are removed from our condensed consolidated balance sheets as a non-cash settlement.
Other
We issue letters of credit and performance bonds, from time to time, with our third-party lenders, to provide collateral.
Cash Flows
The following table summarizes our cash flows from operating, investing, and financing activities:

| Nine Months Ended September 30,
(In Thousands) | 2025 |  | 2024 |  | $ Change
Cash flows from operating activities | $ | (37,465) |  |  | $ | 99,222 |  |  | $ | (136,687) |
Cash flows from investing activities | (258,282) |  |  | (355,392) |  |  | 97,110 |
Cash flows from financing activities | 310,972 |  |  | 305,058 |  |  | 5,914 |
Effect of exchange rate changes on cash | 1,993 |  |  | 1,827 |  |  | 166 |
Total net cash flows | $ | 17,218 |  |  | $ | 50,715 |  |  | $ | (33,497) |

Our service offering also includes the development, construction, and operation of small-scale renewable energy plants. Small-scale renewable energy projects, or energy assets, can either be developed for the portfolio of assets that we own and operate or designed and built for customers. Expenditures related to projects that we own are recorded as cash outflows from investing activities. Expenditures related to projects that we build for customers are recorded as cash outflows from operating activities as cost of revenues.
Cash Flows from Operating Activities
Our cash flows from operating activities during the nine months ended September 30, 2025 decreased over the same period last year primarily due to increases in cash outflows of $188.5 million in unbilled revenue due to the timing of when certain projects are invoiced compared to the prior year period, $40.3 million in deferred revenue, and $56.8 million in prepaid expenses and other
40

Table of Contents
current assets, partially offset by increases in cash inflows of $82.6 million in accounts receivable, $51.1 million in Federal ESPC receivable, and higher net income of $15.7 million.
Cash Flows from Investing Activities
During the nine months ended September 30, 2025 we made capital investments of $283.4 million in new energy assets and $16.6 million in major maintenance of energy assets compared to $341.8 million and $13.6 million, respectively, in 2024.
We currently plan to invest approximately $50 million to $100 million in additional capital expenditures during the remainder of 2025, principally for the construction or acquisition of new renewable energy plants, the majority of which we expect to fund with project finance debt.
Cash Flows from Financing Activities
Our primary sources of financing for the nine months ended September 30, 2025 were proceeds from energy asset financings of $367.3 million, proceeds from long-term corporate debt financings of $100.0 million, net proceeds received from Federal ESPC projects and energy asset receivable financing arrangements of $81.6 million, partially offset by payments on long-term debt and debt fees of $216.6 million, and net payments on our senior secured revolving credit facility of $25.0 million.
Our primary sources of financing for the nine months ended September 30, 2024 were proceeds from energy asset financings of $563.6 million, proceeds from long-term corporate debt financings of $100.0 million, net proceeds received from Federal ESPC projects and energy asset receivable financing arrangements of $134.6 million, contributions from a non-controlling interest of $33.8 million, partially offset by payments on long-term debt and debt fees of $451.7 million, net payments on our senior secured revolving credit facility of $33.4 million, and payments on seller’s promissory note of $41.9 million.
We currently plan additional project financings of approximately $50 million to $100 million during the remainder of 2025 to fund the construction or the acquisition of new renewable energy plants as discussed above.
Critical Accounting Estimates
Preparing our condensed consolidated financial statements in accordance with GAAP involves us making estimates and assumptions that affect reported amounts of assets and liabilities, net sales and expenses, and related disclosures in the accompanying notes at the date of our financial statements. We base our estimates on historical experience, industry and market trends, and on various other assumptions that we believe to be reasonable under the circumstances. However, by their nature, estimates are subject to various assumptions and uncertainties, and changes in circumstances could cause actual results to differ from these estimates, sometimes materially.
There have been no material changes in our critical accounting estimates from those disclosed in Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations of our 2024 Form 10-K. In addition, refer to Note 2 “Summary of Significant Accounting Policies” for updates to critical accounting policies.
Recent Accounting Pronouncements
See Note 2, “Summary of Significant Accounting Policies” for a discussion of recent accounting pronouncements.
Item 3. Quantitative and Qualitative Disclosures About Market Risk
As of September 30, 2025, there have been no significant changes in market risk exposures that materially affected the quantitative and qualitative disclosures as described in Item 7A to our 2024 Form 10-K.
Item 4. Controls and Procedures
Evaluation of Disclosure Controls and Procedures
Our management, with the participation of our principal executive officer and principal financial officer, evaluated the effectiveness of our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, as of the end of the period covered by this quarterly report, or the evaluation date. Disclosure controls and procedures are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding
41

Table of Contents
required disclosures. Our management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives, and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Our management, after evaluating the effectiveness of our disclosure controls and procedures as of the evaluation date, concluded that as of the evaluation date, our disclosure controls and procedures were effective at a reasonable assurance level.
Changes in Internal Control over Financial Reporting
There were no changes in our internal control over financial reporting during our most recent fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.
42

Table of Contents
PART II - OTHER INFORMATION
Item 1. Legal Proceedings
In the ordinary conduct of our business, we are subject to periodic lawsuits, investigations, and claims. Although we cannot predict with certainty the ultimate resolution of such lawsuits, investigations and claims against us, we do not believe that any currently pending or threatened legal proceedings to which we are a party will have a material adverse effect on our business, results of operations or financial condition.
For additional information about certain proceedings, please refer to Note 10, Commitments and Contingencies, to our condensed consolidated financial statements included under Part I, Item 1 of this Quarterly Report on Form 10-Q, which is incorporated into this item by reference.
Item 1A. Risk Factors
Our business is subject to numerous risks, a number of which are described below and under “Risk Factors” in Part I, Item 1A of our 2024 Form 10-K.
You should carefully consider these risks together with the other information set forth in this report, which could materially affect our business, financial condition and future results. The risks described in Part I, Item 1A of our 2024 Form 10-K are not the only risks we face. Risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition, and operating results.
Item 2. Unregistered Sales of Equity and Use of Proceeds
Stock Repurchase Program
We did not repurchase any shares of our common stock under our stock repurchase program authorized by the Board of Directors on April 27, 2016 (the “Repurchase Program”) during the three months ended September 30, 2025. Under the Repurchase Program, we are authorized to repurchase up to $17.6 million of our Class A common stock. As of September 30, 2025, there were shares having a dollar value of approximately $5.7 million that may yet be purchased under the Repurchase Program.
Item 5. Other Information
Director and Officer Trading Arrangements
A portion of the compensation of our directors and officers (as defined in Rule 16a-1(f) under the Exchange Act) is in the form of equity awards and, from time to time, directors and officers engage in open-market transactions with respect to the securities acquired pursuant to such equity awards or other shares of Class A common stock held by such individuals. Transactions in our securities by directors and officers are required to be made in accordance with our insider trading policy, which requires that the transactions be in accordance with applicable U.S. federal securities laws that prohibit trading while in possession of material nonpublic information. Rule 10b5-1 under the Exchange Act provides an affirmative defense that enables directors and officers to prearrange transactions in a company’s securities in a manner that avoids concerns about initiating transactions while in possession of material nonpublic information.
The following table describes contracts, instructions or written plans for the sale or purchase of our Class A common stock adopted or terminated by our directors and officers during the quarter ended September 30, 2025, that are either (1) a contract, instruction or written plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) (a “Rule 10b5-1 trading arrangement”) or (2) a “non-Rule 10b5-1 trading arrangement” (as defined in Item 408(c) of Regulation S-K)):
43

Table of Contents

Name (Title) | Action Taken (Date of Action) | Type of Trading Arrangement | Nature of Trading Arrangement | Duration of Trading Arrangement | Aggregate Number of Securities
Nickolas Stavropoulos, Director | Adoption (September 8, 2025) | Rule 10b5-1 Trading Plan | Sale | Until August 20, 2026 or such earlier date upon which all transactions are completed or expire without execution | 62,000
Louis P. Maltezos, President- Central & Western USA, Canada | Adoption (September 5, 2025) | Durable Rule 10b5-1 trading arrangement for sell-to-cover transactions relating to all equity awards that have or may be granted. | Sale | (1) |
(1) Provides for the automatic sale of shares underlying RSUs in an amount sufficient to satisfy the applicable tax withholding obligation, with the proceeds of the sale delivered to us in satisfaction of the applicable tax withholding obligation. The number of shares subject to covered RSUs that could be sold under this trading arrangement is unknown as the number varies based on the extent to which vesting conditions are satisfied, the market price of our Class A common stock at the time of settlement and the potential future grant of additional RSUs subject to this arrangement.

44

Table of Contents
Item 6. Exhibits
Exhibit Index

Exhibit Number | Description |  |  |
31.1* | Principal Executive Officer Certification required by Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. |  |  |
31.2* | Principal Financial Officer Certification required by Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. |  |  |
32.1** | Certifications pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. |  |  |
101* | The following condensed consolidated financial statements from Ameresco, Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2025, formatted in Inline XBRL (Extensible Business Reporting Language): (i) Condensed Consolidated Balance Sheets (ii) Condensed Consolidated Statements of Income, (iii) Condensed Consolidated Statements of Comprehensive Income, (iv) Condensed Consolidated Statement of Changes in Redeemable Non-Controlling Interests and Stockholders’ Equity, (v) Condensed Consolidated Statements of Cash Flows, and (vi) Notes to Condensed Consolidated Financial Statements. |  |  |
104* | Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101) |  |  |
| *Filed herewith. |  |  |
| **Furnished herewith. |  |  |
| + Identifies a management contract or compensatory plan or arrangement in which an executive officer or director of Ameresco participates. |  |  |

45

Table of Contents
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

|  | AMERESCO, INC. |  |
Date: | November 4, 2025 | By: | /s/ Mark Chiplock
|  |  | Mark Chiplock |
|  |  | Executive Vice President, Chief Financial Officer and Chief Accounting Officer (duly authorized and principal financial officer)

46