ILL. C. C. No. 10 Commonwealth ELECTRICITY Edison Company .

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ILL. C. C. No. 10CommonwealthEdison CompanyELECTRICITY1st Revised Sheet No. 417RATE DSPPDELIVERY SERVICE PRICING AND PERFORMANCEAPPLICABILITY.This tariff is applicable to all retail customers.PURPOSE.The purpose of this tariff is to effectuate the provisions of Section 16-108.5 of the Public Utilities Act (Act)to allow the Company to recover its delivery service costs through the application of a formula rate thatoperates in a transparent and standardized manner with annual updates using information published bythe Company in accordance with various federal and state reporting requirements.DEFINITIONS.Generally, definitions of terms used in this tariff are provided in the Definitions part of the General Termsand Conditions of the Company’s Schedule of Rates.The following definitions are for use specifically in this tariff, as well as in the schedules and appendiceslisted in the Determination of the Annual Revenue Requirement section of this tariff, as applicable:FERC Fm 1FERC Fm 1 means the Company’s Federal Energy Regulatory Commission (FERC) Financial ReportFERC Form No. 1: Annual Report of Major Electric Utilities, Licensees and Others, or its successor.Fm 21 ILCCFm 21 ILCC means the Company’s Annual Report of Electric Utilities Licensees and/or Natural GasUtilities to the Illinois Commerce Commission (ICC).ILCC No 10ILCC No 10 means the Company’s Schedule of Rates of which this tariff is a part.Peak DemandPeak demand means the same as Maximum Kilowatts Delivered (MKD) as defined in the GeneralTerms and Conditions of the Company’s Schedule of Rates.SEC Fm 10KSEC Fm 10K means the Company’s Form 10-K Report that is filed annually with the Securities andExchange Commission, or its successor.(Continued on Sheet No. 418)Filed with the Illinois Commerce Commission onDate Effective: June 20, 2012June 6, 2012. Issued pursuant to theIssued by A. R. Pramaggiore, President and CEOIllinois Commerce Commission Order datedPost Office Box 805379May 29, 2012, in Docket No. 11-0721.Chicago, Illinois 60680-5379

ILL. C. C. No. 10CommonwealthEdison CompanyELECTRICITY1st Revised Sheet No. 418RATE DSPPDELIVERY SERVICE PRICING AND PERFORMANCE(Continued from Sheet No. 417)DEFINITIONS (CONTINUED).Year XYear X means the year for which the Company issued the FERC Fm 1 and the Fm 21 ILCC, datafrom which are used to determine the net revenue requirement in accordance with the provisions ofthis tariff.Year X 1Year X 1 means the year in which the Company submits the net revenue requirement determined inaccordance with the provisions of this tariff and for which projected plant additions are included insuch net revenue requirement.DETERMINATION OF THE ANNUAL REVENUE REQUIREMENT.The Company recovers its costs of providing delivery service through the application of chargesdetermined in accordance with the provisions of this tariff. The Company’s overall delivery service costsare determined in accordance with the provisions of this Determination of the Annual RevenueRequirement section. Such costs are determined with sufficient specificity to operate in a standardizedmanner and are updated on an annual basis. Such costs are determined using transparent informationincluded in the Company’s most recent FERC Form 1 that reflects the Company’s actual costs to providedelivery service to retail customers in the previous calendar year, as well as projected delivery servicerelated plant additions and correspondingly updated depreciation reserves and expenses for the currentcalendar year. Such delivery service costs are subject to review and approval, or approval as modified,by the ICC in accordance with the provisions of the Annual Updates section or Tariff Changes section ofthis tariff.(Continued on Sheet No. 419)Filed with the Illinois Commerce Commission onDate Effective: June 20, 2012June 6, 2012. Issued pursuant to theIssued by A. R. Pramaggiore, President and CEOIllinois Commerce Commission Order datedPost Office Box 805379May 29, 2012, in Docket No. 11-0721.Chicago, Illinois 60680-5379

ILL. C. C. No. 10CommonwealthEdison CompanyELECTRICITY1st Revised Sheet No. 419RATE DSPPDELIVERY SERVICE PRICING AND PERFORMANCE(Continued from Sheet No. 418)DETERMINATION OF THE ANNUAL REVENUE REQUIREMENT (CONTINUED).The following abbreviations, shown with their associated meanings, are used in the spreadsheetspresented in this Determination of the Annual Revenue Requirement section, as well as in the schedulesand appendices listed in this Determination of the Annual Revenue Requirement section.& means And means Dollars 10M means Ten Million Dollars% means Percentage000s means ThousandsA&G means Administrative and GeneralAcct means AccountACRS means Accelerated Cost Recovery SystemADIT means Accumulated Deferred Income TaxAdj means AdjustmentAFUDC means Allowance for Funds Used During ConstructionAMI means Advanced Metering InfrastructureAmort means AmortizationAmt means AmountAMP means Advanced Metering Program AdjustmentApp means AppendixApr means AprilARC means Asset Retirement CostsARO means Asset Retirement ObligationAug means AugustAvg means AverageCARE means Customers’ Affordable Reliable EnergyCIMS means Customer Information and Management SystemCC means Customer ChargeCol means ColumnComp means CompensationCont means ContinuedCWC means Cash Working CapitalCWIP means Construction Work in Progress(Continued on Sheet No. 420)Filed with the Illinois Commerce Commission onDate Effective: June 20, 2012June 6, 2012. Issued pursuant to theIssued by A. R. Pramaggiore, President and CEOIllinois Commerce Commission Order datedPost Office Box 805379May 29, 2012, in Docket No. 11-0721.Chicago, Illinois 60680-5379

ILL. C. C. No. 10CommonwealthEdison CompanyELECTRICITY1st Revised Sheet No. 420RATE DSPPDELIVERY SERVICE PRICING AND PERFORMANCE(Continued from Sheet No. 419)DETERMINATION OF THE ANNUAL REVENUE REQUIREMENT (CONTINUED).Dec means DecemberDFC means Distribution Facilities ChargeDkt means DocketDS means Delivery ServiceEDA means Energy Efficiency and Demand Response AdjustmentExcl means ExcludingFAS means Financial Accounting StandardsFASB means Financial Accounting Standards BoardFeb means FebruaryFICA means Federal Insurance Contributions ActFIN means FASB InterpretationsFoot means FootnoteFR means Formula RateG&I means General and IntangibleHVD means High Voltage DistributionIDOT means Illinois Department of TransportationIEDT means Illinois Electricity Distribution Tax ChargeInt means InterestIPP means Independent Power ProducerITC means Investment Tax CreditJan means JanuaryJul means JulyJun means JuneLIHEAP means Low Income Home Energy Assistance ProgramLn means LineLOC means Letter of CreditMar means MarchMGP means Manufactured Gas PlantML means Meter-Related Facilities LeaseMon means Month(Continued on Sheet No. 421)Filed with the Illinois Commerce Commission onDate Effective: June 20, 2012June 6, 2012. Issued pursuant to theIssued by A. R. Pramaggiore, President and CEOIllinois Commerce Commission Order datedPost Office Box 805379May 29, 2012, in Docket No. 11-0721.Chicago, Illinois 60680-5379

ILL. C. C. No. 10CommonwealthEdison CompanyELECTRICITY1st Revised Sheet No. 421RATE DSPPDELIVERY SERVICE PRICING AND PERFORMANCE(Continued from Sheet No. 420)DETERMINATION OF THE ANNUAL REVENUE REQUIREMENT (CONTINUED).NA means Not ApplicableNS means Nonstandard Services and FacilitiesNov means NovemberO&M means Operation and MaintenanceOct means OctoberOPEB means Other Post Employment BenefitsPCB means Polychlorinated BiphenylsPg means PagePHFU means Property Held for Future UsePMT means Payment FunctionPV means Primary VoltagePORCB means Purchase of Receivables with Consolidated BillingRCA means Retail Customer AssessmentsREC means ReconciliationROE means Return on EquityRoW means Right of WayRRS means Residential Rate Stabilization ProgramRTO means Regional Transmission Organization(Continued on Sheet No. 422)Filed with the Illinois Commerce Commission onDate Effective: June 20, 2012June 6, 2012. Issued pursuant to theIssued by A. R. Pramaggiore, President and CEOIllinois Commerce Commission Order datedPost Office Box 805379May 29, 2012, in Docket No. 11-0721.Chicago, Illinois 60680-5379

ILL. C. C. No. 10CommonwealthEdison CompanyELECTRICITY1st Revised Sheet No. 422RATE DSPPDELIVERY SERVICE PRICING AND PERFORMANCE(Continued from Sheet No. 421)DETERMINATION OF THE ANNUAL REVENUE REQUIREMENT (CONTINUED).Sch means ScheduleSep means SeptemberSERP means Supplemental Pension Benefit PlanSMSC means Standard Metering Service ChargeSV means Secondary VoltageTAX means Municipal and State Tax AdditionsThru means ThroughTRC means Transformer ChargeUS means United StatesVEBA means Voluntary Employee Benefit AssociationWP means Work PaperWtd means WeightedYr means YearThe following cell shadings, shown with their associated meanings, are used in the spreadsheetspresented in this Determination of the Annual Revenue Requirement section.means that the value in the cell is imported from a separate source documentmeans that the value in the cell is imported from a cell in the spreadsheets orfrom a cell in one of the schedules or appendices listed in this Determination ofthe Annual Revenue Requirement sectionmeans that the value in the cell is determined using a mathematical operation(Continued on Sheet No. 423)Filed with the Illinois Commerce Commission onDate Effective: June 20, 2012June 6, 2012. Issued pursuant to theIssued by A. R. Pramaggiore, President and CEOIllinois Commerce Commission Order datedPost Office Box 805379May 29, 2012, in Docket No. 11-0721.Chicago, Illinois 60680-5379

ILL. C. C. No. 10CommonwealthEdison CompanyELECTRICITY1st Revised Sheet No. 423RATE DSPPDELIVERY SERVICE PRICING AND PERFORMANCE(Continued from Sheet No. 422)DETERMINATION OF THE ANNUAL REVENUE REQUIREMENT (CONTINUED).Net Revenue Requirement ComputationThe Net Revenue Requirement is determined in accordance with the spreadsheet provided in this NetRevenue Requirement Computation subsection. The computations in such spreadsheet, hereinidentified as Sch FR A-1, are made in accordance with Section 16-108.5 of the Act and applicableprovisions of the 83 Illinois Administrative Code.Commonwealth Edison CompanyNet Revenue Requirement ComputationLnYr XYr X 1Source1234567891011DescriptionDS Operating ExpenseDistribution ExpenseCustomer Accts ExpenseCustomer Service and Informational ExpenseA&G ExpenseCurrent Depreciation and Amort ExpenseProjected Depreciation and Amort ExpenseTaxes Other Than IncomeRegulatory Asset AmortPension Funding CostOther Expense AdjsTotal DS Operating Expenses121314151617181920212223DS Rate BasePre-Tax Wtd Avg Cost of Capital (%)Authorized ReturnInterest Synchronization DeductionAfter Tax Return on DS Rate BaseIncremental Tax Gross Up Factor (%)Incremental Tax Gross UpImpact of ITCs and Permanent Tax DifferencesAuthorized Return Grossed Up for TaxesRevenue Requirement Before Other RevenuesTotal Other RevenuesRevenue RequirementSch FR B-1 Ln 36Sch FR D-1 Col C Ln 21(Ln 12) * (Ln 13)(Sch FR C-4 Ln 9) * (-1.0)(Ln 14) (Ln 15)Sch FR C-4 Ln 5(Ln 16) * (Ln 17)Sch FR C-4 Ln 14(Ln 16) (Ln 18) (Ln 19)(Ln 11) (Ln 20)App 10 Col F Ln 59(Ln 21) - (Ln 22)24Reconciliation With InterestSch FR A-4 Ln 31Sch FR A-1Actual DataProjected AdditionsAmt ( in 000s)Sch FR C-1 Ln 11Sch FR C-1 Ln 12Sch FR C-1 Ln 13Sch FR C-1 Ln 14Sch FR C-1 Ln 15Sch FR C-1 Ln 16Sch FR C-1 Ln 17Sch FR C-1 Ln 18Sch FR C-1 Ln 19Sch FR C-1 Ln 20Sum of (Ln 1) thru (Ln 10)(Continued on Sheet No. 424)Filed with the Illinois Commerce Commission onDate Effective: June 20, 2012June 6, 2012. Issued pursuant to theIssued by A. R. Pramaggiore, President and CEOIllinois Commerce Commission Order datedPost Office Box 805379May 29, 2012, in Docket No. 11-0721.Chicago, Illinois 60680-5379

CommonwealthEdison CompanyELECTRICITYILL. C. C. No. 106th Revised Sheet No. 424(Canceling 5th Revised Sheet No. 424)RATE DSPPDELIVERY SERVICE PRICING AND PERFORMANCE(Continued from Sheet No. 423)DETERMINATION OF THE ANNUAL REVENUE REQUIREMENT (CONTINUED).Net Revenue Requirement Computation (Continued)*Commonwealth Edison CompanyNet Revenue Requirement ComputationLnYr XYr X 12526272829DescriptionROE CollarDS ROE (%)Allowed ROE (%)Maximum Allowed ROE (%)Minimum Allowed ROE (%)Percent Above Maximum Allowed ROE (%)3031Amt Above Allowed ROE CollarPercent Below Minimum Allowed ROE (%)32333435Amt Below Allowed ROE CollarROE Collar Adj After TaxROE Collar Tax Gross-UpROE Collar AdjSch FR A-3 Ln 26Sch FR D-1 Col D Ln 11(Ln 26) (0.0%)(Ln 26) - (0.0%)IF(Ln 25) (Ln 27) THEN (Ln 25) - (Ln 27)ELSE (0.0%)(Sch FR A-3 Ln 5) * (Ln 29) * (-1.0)IF(Ln 25) (Ln 28) THEN (Ln 28) - (Ln 25)ELSE (0.0%)(Sch FR A-3 Ln 5) * (Ln 31)(Ln 30) (Ln 32)(Ln 33) * (Sch FR C-4 Ln 5)(Ln 33) (Ln 34)36Net Revenue Requirement(Ln 23) (Ln 24) (Ln 35)37Prior Yr Applicable Net RevenueRequirementChange in Net Revenue Requirement fromPrior YrPrior Yr Sch FR A-1 Ln 3638SourceSch FR A-1 (Cont)Actual DataProjected AdditionsAmt ( in 000s)(Ln 36) - (Ln 37)Notwithstanding the previous provisions of this Net Revenue Requirement Computation subsection,for the purposes of determining the updated Net Revenue Requirement calculated in accordance withthe ICC’s Orders in Docket No. 13-0553 and Docket No. 13-0318 and filed by the Company incompliance with the ICC Order in Docket No. 13-0318 for application beginning with the January2014 monthly billing period, the Reconciliation With Interest at Line 24 of Sch FR A-1 must includeadjustments to incorporate applicable retrospective changes to the interest on the reconciliationdetermined in accordance with Public Act 98-0015, as interpreted by the ICC in its Order in DocketNo. 13-0553.(Continued on Sheet No. 425)Filed with the Illinois Commerce Commission onDate Effective: February 26, 2018January 12, 2018. Filed pursuant toIssued by A. R. Pramaggiore, President and CEOIllinois Public Act 099-0906 enactedPost Office Box 805379June 1, 2017.Chicago, Illinois 60680-5379Asterisk (*) indicates change.

CommonwealthEdison CompanyELECTRICITYILL. C. C. No. 103rd Revised Sheet No. 425(Canceling 1st Revised Sheet No. 425)RATE DSPPDELIVERY SERVICE PRICING AND PERFORMANCE(Continued from Sheet No. 424)*DETERMINATION OF THE ANNUAL REVENUE REQUIREMENT (CONTINUED).Revenue Requirement Reconciliation ComputationThe revenue requirement reconciliation amount is determined in accordance with the spreadsheetprovided in this Revenue Requirement Reconciliation Computation subsection. The computations insuch spreadsheet, herein identified as Sch FR A-1 - REC, are made in accordance with Section 16108.5 of the Act and applicable provisions of the 83 Illinois Administrative Code.Commonwealth Edison CompanyRevenue Requirement Reconciliation DescriptionDS Operating ExpenseDistribution ExpenseCustomer Accts ExpenseCustomer Service and Informational ExpenseA&G ExpenseCurrent Depreciation and Amort ExpenseProjected Depreciation and Amort ExpenseTaxes Other Than IncomeRegulatory Asset AmortPension Funding CostOther Expense AdjsTotal DS Operating ExpensesDS Rate Base ReconciliationPre-Tax Wtd Avg Cost of Capital (%)Authorized ReturnInterest Synchronization DeductionAfter Tax Return on DS Rate BaseIncremental Tax Gross Up Factor (%)Incremental Tax Gross UpImpact of ITCs and Permanent Tax DifferencesAuthorized Return Grossed Up for TaxesRevenue Requirement Before Other RevenuesTotal Other RevenuesActual Revenue Requirement(1’)Note:Amts are blank for initial filingYr XNASourceSch FR C-1 Ln 11Sch FR C-1 Ln 12Sch FR C-1 Ln 13Sch FR C-1 Ln 14Sch FR C-1 Ln 15NASch FR C-1 Ln 17Sch FR C-1 Ln 18Sch FR C-1 Ln 19Sch FR C-1 Ln 20Sum of (Ln 1) thru (Ln 10)Sch FR B-1 Ln 28Sch FR D-1 Col D Ln 21(Ln 12) * (Ln 13)(Sch FR C-4 Ln 18) * (-1.0)(Ln 14) (Ln 15)Sch FR C-4 Ln 5(Ln 16) * (Ln 17)Sch FR C-4 Ln 14(Ln 16) (Ln 18) (Ln 19)(Ln 11) (Ln 20)App 10 Col F Ln 59(Ln 21) - (Ln 22)Sch FR A-1 - RECActual DataProjected AdditionsAmt ( in 000s) (1’)NATo Sch FR A-4 Ln 1(Continued on Sheet No. 426)Filed with the Illinois Commerce Commission onDate Effective: June 6, 2013June 5, 2013. Issued pursuant toIssued by A. R. Pramaggiore, President and CEOPublic Act 98-0015 enacted on May 22, 2013.Post Office Box 805379Asterisk (*) indicates change.Chicago, Illinois 60680-5379

ILL. C. C. No. 10CommonwealthEdison CompanyELECTRICITY1st Revised Sheet No. 426RATE DSPPDELIVERY SERVICE PRICING AND PERFORMANCE(Continued from Sheet No. 425)DETERMINATION OF THE ANNUAL REVENUE REQUIREMENT (CONTINUED).In developing data that are used in the spreadsheets previously presented in this Determination of theAnnual Revenue Requirement section, the Company must prepare the following schedules (Schs):Sch FR A-2:Sch FR A-3:Sch FR A-4:Sch FR B-1:Sch FR B-2:Sch FR C-1:Sch FR C-2:Sch FR C-3:Sch FR C-4:Sch FR D-1:Sch FR D-2:Allocators ComputationReturn on Equity (ROE) for Collar ComputationReconciliation ComputationRate Base Summary ComputationDS Jurisdictional General and Intangible Plant ComputationExpenses ComputationDepreciation and Amortization Expense ComputationPension Funding Costs ComputationTaxes ComputationCost of Capital ComputationAverage Yield on Treasury Securities ComputationIn developing data that are used in the spreadsheets previously presented in this Determination of theAnnual Revenue Requirement section, the Company must prepare the following appendices (Apps):App 1:App 2:App 3:App 4:App 5:App 6:App 7:App 8:App 9:App 10:App 11:Capital InformationCustomer Deposits InformationCash Working Capital InformationAccumulated Deferred Income Taxes InformationDeferred Charges InformationProperty Held for Future Use in Rate Base InformationExpense InformationDepreciation InformationPermanent Tax Impacts InformationOther Revenues InformationFranchise Delivery Service Value Information(Continued on Sheet No. 427)Filed with the Illinois Commerce Commission onDate Effective: June 20, 2012June 6, 2012. Issued pursuant to theIssued by A. R. Pramaggiore, President and CEOIllinois Commerce Commission Order datedPost Office Box 805379May 29, 2012, in Docket No. 11-0721.Chicago, Illinois 60680-5379

CommonwealthEdison CompanyELECTRICITYILL. C. C. No. 102nd Revised Sheet No. 427(Canceling 1st Revised Sheet No. 427)RATE DSPPDELIVERY SERVICE PRICING AND PERFORMANCE(Continued from Sheet No. 426)DETERMINATION OF THE ANNUAL REVENUE REQUIREMENT (CONTINUED).In developing data that are used in the spreadsheets previously presented in this Determination of theAnnual Revenue Requirement section, the Company must prepare the following work papers (WPs):*WP 1:WP 2:WP 3:WP 4:WP 5:WP 6:WP 7:WP 8:WP 9:WP 10:WP 11:WP 12:WP 13:WP 14:WP 15:WP 16:WP 17:WP 18:WP 19:WP 20:WP 21:WP 22:WP 23:WP 24:WP 25:WP 26:Costs Recovered Through Other Tariffs and Costs Disallowed in Previous ICC OrdersCustomer Deposit InformationCash Working CapitalAccumulated Deferred Income TaxesDeferred ChargesProperty Held for Future UseExpense InformationOne-Time, Unusual Expense Greater Than 10 Million - Amortized Over Five YearsPermanent Tax AdjustmentsOther Miscellaneous Revenue AdjustmentsCustomer AdvancesCost of Short-Term DebtCost of Long-Term DebtAccounts Payable Related to Materials and SuppliesRevenue Allocator CalculationCommunications Equipment Directly Assigned to DistributionDelivery Service Easement Allocator CalculationCWIP not Accruing AFUDCProjected Plant AdditionsAsset Retirement Obligation - Accumulated ReserveTax RatesCalculation of Prior Year ForecastPerformance Metrics PenaltyAdjusted Common Equity BalanceGeneral and Intangible Plant ComputationOther Adjustments Pertaining to ICC Orders and/or Statutes(Continued on Sheet No. 428)Filed with the Illinois Commerce Commission onDate Effective: December 12, 2013December 5, 2013. Issued pursuant to theIssued by A. R. Pramaggiore, President and CEOIllinois Commerce Commission Order inPost Office Box 805379Docket No. 13-05

AMP means Advanced Metering Program Adjustment App means Appendix Apr means April ARC means Asset Retirement Costs ARO means Asset Retirement Obligation . LOC means Letter of Credit Mar means March MGP means Manufactured Gas Plant ML means Meter-Related Facilities Lease Mon means Month . ILL. C. C. No. 10

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