Mail Log Office Fax pepco.com.

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1 Matthew K. Segers Assistant General Counsel EP Ninth Street NW Washington, DC Mail Log Office Fax pepco.co IB pepco. An Exelon Copany October 29, 2018 Terry J. Roine Executive Secretary Public Service Coission of Maryland Willia Donald Schaefer Tower 6 St. Paul Street, Ib''^ Floor Baltiore, MD Re: Case Nos. 9056/9064 Dear Ms. Roine: Enclosed for filing are an original and seventeen (17) copies (five three-hole punched) of Potoac Electric Power Copany's Rider "SOS" - Standard Offer Service. Rider "SOS" has been updated to reflect SOS rates for Type II Custoers effeetive Deceber 1, 2018 through February 28, 2019 and Residential and Type I rates effective June 1, 2019 through Septeber 30, These rates are based on the bids approved by the Coission in Order No Sincerely, Matthew Enclosure cc: All Parties of Record

2 MD One Hundred and Forty-First Revised Page No. 1 RATE SCHEDULES FOR ELECTRIC SERVICE IN MARYLAND POTOMAC ELECTRIC POWER COMPANY EpepGO An Exelon Copany RATES AND REGULATORY PRACTICES GROUP Date of Issue: October 29, 2018 Deceber 1, 2018

3 MD One Hundred and Forty-First Revised Page No. 2 TABLE OF CONTENTS RATE SCHEDULES RESIDENTIAL SERVICE - SCHEDULE "R" Page TIME METERED RESIDENTIAL SERVICE - SCHEDULE "R-TM" Page GENERAL SERVICE - SCHEDULE "GS" Page TEMPORARY SERVICE - SCHEDULE "T" Page TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE II SCHEDULE "MGT LV II" Page TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE II A SCHEDULE "MGT LV II A" (THIS SCHEDULE HAS BEEN DELETED) Page TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE III SCHEDULE "MGT LV III" Page TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE II SCHEDULE "MGT 3A II" Page TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE II A SCHEDULE "MGT 3A II A" (THIS SCHEDULE HAS BEEN DELETED) Page TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE III SCHEDULE "MGT 3A III" Page TIME METERED GENERAL SERVICE - LOW VOLTAGE - SCHEDULE "GT LV Page TIME METERED GENERAL SERVICE - PRIMARY SERVICE - SCHEDULE "GT 3A" Page TIME METERED GENERAL SERVICE - HIGH VOLTAGE - SCHEDULE "GT 3B" Page TIME METERED RAPID TRANSIT SERVICE - SCHEDULE "TM-Rr Page ELECTRIC VEHICLE SERVICE - SCHEDULE "EV Page (THIS SCHEDULE IS CLOSED TO NEW CUSTOMERS) OUTDOOR LIGHTING SERVICE - SCHEDULE "OL" Page STREET LIGHTING SERVICE - SCHEDULE "SL" Page SERVICING STREET LIGHTS SERVED FROM OVERHEAD LINES - SCHEDULE "SSL-OH" Page SERVICING STREET LIGHTS SERVED FROM UNDERGROUND LINES - SCHEDULE "SSL-UG" Page Date of Issue: October 29, 2018 Deceber 1, 2018

4 MD One Hundred and Forty-First Revised Page No. 2.1 SERVICING STREET LIGHTS SERVED FROM OVERHEAD LINES - SCHEDULE "SSL-OH-LED" Page SERVICING STREET LIGHTS SERVED FROM UNDERGROUND LINES - SCHEDULE "SSL-UG-LED" Page TELECOMMUNICATIONS NETWORK SERVICE - SCHEDULE "TN" Page COGENERATION AND SMALL POWER PRODUCTION INTERCONNECTION SERVICE - SCHEDULE "CG-SPP" PURCHASE OF POWER Page STANDBY SERVICE - SCHEDULE "S" Page PLUG-IN VEHICLE CHARGING - SCHEDULE "PIV" Page RESIDENTIAL SERVICE - PLUG-IN VEHICLE CHARGING - SCHEDULE "R-PIV Page COMMUNITY SOLAR PILOT PROGRAM - SCHEDULE "CS" Page RESERVED FOR FUTURE USE Page RIDERS MARKET PRICE SERVICE - RIDER "MPS" Page (THIS RIDER HAS BEEN DELETED) UNIVERSAL SERVICE CHARGE RECOVERY - RIDER "USC" Page 28 GENERATION PROCUREMENT CREDIT - RIDER "GPC" Page (THIS RIDER HAS BEEN DELETED) EXPERIMENTAL RESIDENTIAL ELECTRIC VEHICLE SERVICE - RIDER "R-EV Page 30 EXPERIMENTAL RESIDENTIAL TIME-OF-USE ELECTRIC VEHICLE SERVICE - RIDER "R-TM-EV Page 30.2 NET ENERGY METERING "NEM" Page EXPERIMENTAL CONJUNTIVE BILLING SERVICE - RIDER "CBS" Page (THIS RIDER HAS BEEN DELETED) TELECOMMUNICATION NETWORK CHARGE - RIDER "SL-TN" Page 33 POWER FACTOR - RIDER "PF" Page 34 THERMAL ENERGY STORAGE SERVICE - RIDER "TS" Page 35 DELIVERY TAX SURCHARGE - RIDER "DT" Page 36 MONTGOMERY COUNTY SURCHARGE - RIDER "MCS" Page 37 MARYLAND ENVIRONMENTAL SURCHARGE - RIDER "MES" Page 38 Date of Issue: October 29, 2018 Deceber 1, 2018

5 IV One Hundred and Eighth Revised Page No. 2.2 TEMPORARY TAX COMPLIANCE SURCHARGE - RIDER "TTCS" Page 39 (THIS RIDER HAS BEEN DELETED) OPTIONAL METER EQUIPMENT RELATED SERVICES - RIDER "OMRS" Pages EXCESS FACILITIES - RIDER "EF" Page 41 DIVESTITURE SHARING CREDIT - RIDER "DS" Page 42 (THIS RIDER HAS BEEN DELETED) STANDARD OFFER SERVICE - RIDER "SOS" Page ADMINISTRATIVE CREDIT - RIDER "AC" Page 44 SOS PHASE IN CREDIT/DEFERRED COST ADJUSTMENT-RIDER "SOS PIC/DCA" Page (THIS RIDER HAS BEEN DELETED) RESERVED DELIVERY CAPACITY SERVICE - RIDER "RDCS" Page BILL STABILIZATION ADJUSTMENT - RIDER "BSA" Page EMPOWER MD CHARGE - RIDER "E-MD" Page RESIDENTIAL DIRECT LOAD CONTROL - RIDER "R-DLC" Page RGGI RATE CREDIT - RIDER "RRC" Page 50 MASTER-METERED DIRECT LOAD CONTROL - RIDER "MM-DLC" Page AGGREGATE NET ENERGY METERING - RIDER "ANEM" Page NON-RESIDENTIAL DIRECT LOAD CONTROL - RIDER "NR-DLC" Page 53 DEMAND RESOURCE SURCHARGE - RIDER "DRS" Page DYNAMIC PRICING - PEAK ENERGY SAVINGS CREDIT - RIDER "DP" Page GRID RESILIENCY CHARGE - RIDER "GRC" Page COMMUNITY NET ENERGY METERING PILOT PROGRAM "RIDER CNM" Page Date of Issue: October 29, 2018 Deceber 1, 2018

6 --p. IV Sixty-Fourth Revised Page No. 43 STANDARD OFFER SERVICE RIDER "SOS" RIDER "SOS" - STANDARD OFFER SERVICE Available in the Maryland portion of the Copany's service area for the provision of Generation and Transission Services to custoers who do not have an alternate supplier for Generation and Transission Services as defined in the Custoer Choice Act, Section 7-510(C)(2). Standard Offer Service (SOS) is available beginning July 1, 2004 in accordance with the provisions contained in the Maryland Case No Settleent Agreeents (Phase I and II) approved by the Maryland Public Service Coission in Order Nos and and in the Code of Maryland Regulations (COMAR) Electric Standard Offer Service. DESCRIPTION OF SOS TYPES Residential Applicable to custoers served on Schedules "R" and "R-TM". Custoers ay leave or return to Rider "SOS" without penalty by the Copany, subject to the Copany's General Ters and Conditions. A Custoer shall not change Type within the SOS year. Type I Non-Residential Applicable to custoers served on Schedules "GS", "T", "SL", "TN", "EV", and "OL". Custoers ay leave or return to Rider "SOS" without penalty by the Copany, subject to the Copany's General Ters and Conditions. A Custoer shall not change Type within the SOS year. Type II Non-Residential Applicable to custoers served on Schedules "MOT LV II" and "MOT 3A II". Custoers ay leave or return to Rider "SOS" without penalty by the Copany, subject to the Copany's General Ters and Conditions. A Custoer shall not change Type within the SOS year. Hourly-Priced Service (HPS) Applicable to custoers served on Schedules "MOT LV III", "MOT 3A III" "GT LV" "GT 3A" "GT 3B" and "TM-RT". Custoers ay leave or return to Rider "SOS" without penalty by the Copany, subject to the Copany's General Ters and Conditions. When a custoer purchasing fro an alternate supplier, other than the Copany, returns or is returned to the Copany on or after June 1, 2005, the custoer will receive HPS. A Custoer shall not change Type within the SOS year. Date of Issue: October 29, 2018 Deceber 1, 2018

7 MD Sixty-Fourth Revised Page No MONTHLY RATE Custoers receiving Standard Offer Service will pay the Distribution Service Charge, Transission Service Charge and including all applicable riders. The Distribution Service Charges are stated in the Monthly Rates for the Custoer's applicable Rate Schedule. The Standard Offer Service Rate for each Rate Schedule within each SOS Type, including any usage incurred under associated Riders, will include the following coponents: 1. The seasonally-differentiated and, if applicable, tie-of-use differentiated load weighted average of all awarded electric supply prices for specific services in each year. 2. Retail charges designed to recover, on an aggregate basis, FERC-approved transission charges and any other PJM charges and costs incurred by Pepco. 3. An adinistrative charge (included in Generation rates shown below) Residential Type I Type II 4. Applicable taxes. SOS - Residential (Generation, ) Schedule R $ per kwh $ per kwh $ per kwh Transission including separately calculated GRT, and 06/01/18-09/30/18 10/01/18-05/31/19 06/01/19-09/30/19 $ per kwhr $ per kwhr $ kwhr $ per kwhr $ per kwhr See for currently effective rate Schedule R-TM Off 06/01/18-09/30/18 10/01/18-05/31/19 $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr 06/01/19-09/30/19 $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr See for currently effective rate SOS - Type I Non-Residential (Generation, Transission including separately calculated GRT, and ) Schedules GS and EV 06/01/18-09/30/18 $ per kwhr 10/01/18-05/31/19 $ per kwhr 06/01/19-09/30/19 $ per kwhr $ per kwhr $ per kwhr See for currently effective rate Schedule T Date of Issue: October 29, /01/18-09/30/18 10/01/18-05/31/19 06/01/19-09/30/19 $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr See for currently effective rate Deceber 1, 2018

8 MD Sixty-Fourth Revised Page No MONTHLY RATE (continued) SOS - Type I Non-Residential (Generation, Transission including separately calculated GRT, and ) (continued) Schedule SL Kiiowatt-hour Charge 06/01/18-09/30/18 10/01/18-05/31/19 06/01/19-09/30/19 $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr See for currently effective rate Schedule OL Mercury Vapor 175 Watt 250 Watt 400 Watt 06/01/18-09/30/18 $ 4.51 per lap $ 6.23 per lap $ 9.56 per lap 10/01/18-05/31/19 06/01/19-09/30/19 $ 4.36 per lap $ 6.02 per lap $ 9.24 per lap $ 3.49 per lap $ 4.82 per lap $ 7.40 per lap High Pressure Sodiu 100 Watt 150 Watt 250 Watt $ 2.58 per lap $ 3.76 per lap $ 6.34 per lap $ 2.49 per lap $ 3.63 per lap $ 6.12 per lap $ 2.00 per lap $ 2.91 per lap $ 4.91 per lap 175 Watt 250 Watt 400 Watt $ 0.00 per lap $ 0.00 per lap $ 0.00 per lap $ 0.00 per lap $ 0.00 per lap $ 0.00 per lap See for currently effective rate Schedule TN and Rider SL-TN Kiiowatt-hour Charge 06/01/18-09/30/18 10/01/18-05/31/19 06/01/19-09/30/19 $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr See co for currently effective rate SOS - Type II Non-Residential (Generation, Transission including separately calculated GRT, and ) Schedule MGT LV li 03/01/18-05/31/18 06/01/18-08/31/18 09/01/18-11/30/18 12/01/18-02/28/19 Interediate Off Peak $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr Maxiu $ per kwhr $ per kwhr $ $ per kw per kw $ per kw See for currently effective rate Date of Issue; October 29, 2018 Deceber 1, 2018

9 MD Sixty-Fourth Revised Page No MONTHLY RATE (continued) SOS - Type II Non-Resldentlal (Generation, Transission including separately calculated GRT, and ) (continued) Schedule MGT 3A ii 03/01/18-05/31/18 06/01/18-08/31/18 09/01/18-11/30/18 12/01/18-02/28/19 Kiiowatt-hour Charge interediate Off Peak Kiiowatt-hour Charge $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr $ per kwhr Maxiu $ per kw $ per kw $ per kw See for currently effective rate $ per kwhr $ per kwhr $ per kwhr Date of Issue: October 29, 2018 Deceber 1, 2018

10 MD Sixty-Fourth Revised Page No SOS - Hourly Priced Service (HPS) Schedules MOT LV III, MOT 3A III, GT LV, GT 3A, GT 3B, and TM-RT The Hourly Price Service will include: 1. Market Hourly Energy Charge - The Custoer's hourly energy usage, adjusted for applicable losses, ultiplied by the hourly energy charge. The hourly energy charge will consist of the 1) hourly integrated real tie fixed nodal weighted aggregate Locational Marginal Price (LMP) values for the Pepco zone, or its successor for the retail load served in Pepco's Maryland service area, as deterined and reported by the PJM; 2) An Adinistrative Charge of between $ and $ per kwh, any applicable taxes, and other ites as provided for in paragraphs 79 and 82 of the Phase I Settleent In Maryland Case No. 6908; and 3) Generation Ancillary Service Charges based on the previous onth's average cents per kwh generation ancillary service cost for HPS custoers in the Pepco Zone as deterined and reported by PJM. 2. Monthly Capacity Charge - Deterined by suing over each day during the Custoer's billing period the Custoer's obligation in MW ultiplied by the daily cost per MW of procuring capacity. The daily Capacity procureent cost shall be in dollars per MW-day, based on capacity purchased to cover HPS shortages and any penalties or deficiency charges and broker fees accruing for the day of the calculation. When a Custoer's account does not have interval data, the Custoer's historical data will be used to develop the hourly use. - The transission service charges stated in this SOS - Hourly Priced Service (HPS) section apply only to Type III custoers receiving HPS fro Pepco. Date of Issue: October 29, 2018 Deceber 1, 2018

11 MD Sixty-Fourth Revised Page No MONTHLY RATE (continued) SOS - Hourly Priced Service (HPS) Schedules MOT LV III, MOT 3A III, GT LV, GT 3A, GT 3B, and TM-RT (continued) Schedule MGT LV ill. $ per kwhr $ per kwhr, $ per kw Maxiu $ per kw $ per kw Schedule MGT 3A III $ per kwhr $ per kwhr $ per kw Maxiu $ per kw $ per kw Schedule GT LV $ per kwhr $ per kwhr $ per kw Maxiu $ perkw $ perkw Schedule GT 3A $ per kwhr $ per kwhr $ per kw Maxiu $ per kw $ per kw Schedule GT 3B $ per kwhr $ per kwhr $ perkw Maxiu $ per kw $ per kw Schedule TM-RT $ per kwhr $ per kwhr $ per kw Maxiu $ per kw $ per kw The onthly HPS charges shall equal the actual cost of providing energy and capacity supply transission servi ancillary service, and any other cost eleent directly related to the Copany's HPS load obligation, including an Adinistrative Charge and applicable taxes. The Copany will deterine an Hourly Price Service (HPS - PCA) which will reflect the difference between the actual cost of serving Custoers under HPS (including any cost adjustents fro the PJM Settleent syste) and the aount billed to HPS Custoers for the sae tie period. The Copany will deterine the HPS-PCA rate by dividing the HPS-PCA aount by the total kilowatt-hour sales of the then current HPS custoers. The HPS-PCA rate will be applied to each of the then current HPS custoers' sales to deterine the credit/charge for the billing onth. At the conclusion of Hourly Price Service on June 1, 2006, any HPS PCA will be returned to, or collected fro all Type II Custoers regardless of their supplier. Date of Issue: October 29, 2018 Deceber 1, 2018

12 MD Fifty-Ninth Revised Page No BILLING MONTHS - Billing onths of June through October - Billing onths of Noveber through May. RATING PERIODS Weekdays -(Excluding Holidays) On-Peak Period 12:00 noon to 8:00 p.. Interediate Period 8:00 a.. to 12:00 noon and 8:00 p.. to 12:00 idnight Off-Peak Period 12:00 idnight to 8:00 a.. Saturdays, Sundays and Holidays Off-Peak Period All Hours Holidays For the purpose of this tariff, holidays will be New Year's Day, Rev. Martin Luther King's Birthday, Presidents' Day, Meorial Day, Independence Day, Labor Day, Colubus Day, Veterans' Day, Thanksgiving Day and Christas Day, as designated by the Federal Governent. BILLING DEMANDS On-Peak ( Billing Months Only) - The billing deand shall be the axiu thirty (30) inute deand recorded during the on-peak period of the billing onth. Maxiu (All Months) - The billing deand shall be the axiu thirty (30) inute deand recorded during the billing onth. PROCUREMENT COST ADJUSTMENT In addition to the Standard Offer Service rates shown above, for Residential, Type I, and Type II custoers (excludes HPS custoers) there will be a onthly (PCA) shown as a separate line ite on the Custoer's bill. Refer to HPS for the Hourly Priced Service Procureent Cost Adjustent (HPS-PCA). The PCA is a $ per kilowatt-hour rate applied to the Custoer's billed kilowatt-hours. The PCA is an adjustent ade in order to true-up the rates custoers are billed to reflect the Copany's actual costs of providing Standard Offer Service. A true-up adjustent will be ade to the PCA at least three (3) ties per year- effective with the June, Noveber and February billing onths. These true-ups will revise the PCA based on actual and forecasted collections of SOS revenues by SOS Type and the actual and forecasted cost of providing Standard Offer Service. The current applicable PCA rate by SOS Type is available on the Copany's website at PUBLICATION OF PRICES The Standard Offer Service Rates shown in this Rider are posted on the Copany's website at The arket hourly Locational Marginal Prices used for HPS are available on the PJM website at Date of Issue: October 29, 2018 Deceber 1, 2018

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14 MD One Hundred and Portiett^Fortv-First Revised Page No. 1 RATE SCHEDULES FOR ELECTRIC SERVICE IN MARYLAND POTOMAC ELECTRIC POWER COMPANY ^ pepco s An Exelon Copany RATES AND REGULATORY PRACTICES GROUP Date of Issue: October 4829, 2018 October 19 Deceber ivt

15 Electric--P.S.C. Md. No. 1 MD One Hundred and FortiethFortv-First Revised Page No. 2 TABLE OF CONTENTS RATE SCHEDULES RESIDENTIAL SERVICE - SCHEDULE "R" Page TIME METERED RESIDENTIAL SERVICE-SCHEDULE"R-TM" Page GENERAL SERVICE - SCHEDULE "GS" Page TEMPORARY SERVICE - SCHEDULE'T' Page TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE II SCHEDULE "MGT LVII" Page TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE IIA SCHEDULE "MGT LV II A" (THIS SCHEDULE HAS BEEN DELETED) Page TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE III SCHEDULE "MGT LV III" Page TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE II SCHEDULE "MGT 3AII" Page TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE II A SCHEDULE "MGT 3AII A" (THIS SCHEDULE HAS BEEN DELETED) Page TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE III SCHEDULE "MGT 3A III" Page TIME METERED GENERAL SERVICE - LOW VOLTAGE - SCHEDULE "GT LV Page TIME METERED GENERAL SERVICE - PRIMARY SERVICE - SCHEDULE "GT 3A" Page TIME METERED GENERAL SERVICE - HIGH VOLTAGE - SCHEDULE "GT 3B" Page TIME METERED RAPID TRANSIT SERVICE - SCHEDULE "TM-RT' Page ELECTRIC VEHICLE SERVICE - SCHEDULE "EV Page (THIS SCHEDULE IS CLOSED TO NEW CUSTOMERS) OUTDOOR LIGHTING SERVICE - SCHEDULE "OL" Page STREET LIGHTING SERVICE - SCHEDULE "SL" Page SERVICING STREET LIGHTS SERVED FROM OVERHEAD LINES - SCHEDULE "SSL-OH" Page SERVICING STREET LIGHTS SERVED FROM UNDERGROUND LINES - SCHEDULE "SSL-UG" Page Dateof Issue: October 4829, 2018 October 19 Deceber

16 MD One Hundred and Poftiett»Fortv-First Revised Page No. 2.1 SERVICING STREET LIGHTS SERVED FROM OVERHEAD LINES- SCHEDULE "SSL-OH-LED" Page SERVICING STREET LIGHTS SERVED FROM UNDERGROUND LINES- SCHEDULE "SSL-UG-LED" Page TELECOMMUNICATIONS NETWORK SERVICE - SCHEDULE "TN" Page COGENERATION AND SMALL POWER PRODUCTION INTERCONNECTION SERVICE - SCHEDULE "CG-SPP" PURCHASE OF POWER Page STANDBY SERVICE - SCHEDULE "S" Page PLUG-IN VEHICLE CHARGING - SCHEDULE "PIV Page RESIDENTIAL SERVICE - PLUG-IN VEHICLE CHARGING - SCHEDULE "R-PIV Page COMMUNITY SOLAR PILOT PROGRAM - SCHEDULE "CS" Page RESERVED FOR FUTURE USE Page RIDERS MARKET PRICE SERVICE - RIDER "MPS" Page (THIS RIDER HAS BEEN DELETED) UNIVERSAL SERVICE CHARGE RECOVERY - RIDER "USC" Page 28 GENERATION PROCUREMENT CREDIT - RIDER "GPC" Page (THIS RIDER HAS BEEN DELETED) EXPERIMENTAL RESIDENTIAL ELECTRIC VEHICLE SERVICE - RIDER "R-EV Page 30 EXPERIMENTAL RESIDENTIAL TIME-OF-USE ELECTRIC VEHICLE SERVICE - RIDER "R-TM-EV Page 30.2 NET ENERGY METERING "NEM" Page EXPERIMENTAL CONJUNTIVE BILLING SERVICE - RIDER "CBS" Page (THIS RIDER HAS BEEN DELETED) TELECOMMUNICATION NETWORK CHARGE - RIDER "SL-TN" Page 33 POWER FACTOR - RIDER "PF" Page 34 THERMAL ENERGY STORAGE SERVICE - RIDER "TS" Page 35 DELIVERY TAX SURCHARGE - RIDER "DT" Page 36 MONTGOMERY COUNTY SURCHARGE - RIDER "MCS" Page 37 MARYLAND ENVIRONMENTAL SURCHARGE - RIDER "MES" Page 38 Dateof Issue: October+829, 2018 October 19 Deceber

17 f' Electric-P.S.C. Md, No. 1 MD One rfundred and Seventh Eighth Revised Page No. 2.2 TEMPORARY TAX COMPLIANCE SURCHARGE - RIDER "TTCS" Page 39 (THIS RIDER HAS BEEN DELETED) OPTIONAL METER EQUIPMENT RELATED SERVICES - RIDER "OMRS" Pages EXCESS FACILITIES - RIDER "EF" Page 41 DIVESTITURE SHARING CREDIT - RIDER "DS" Page 42 (THIS RIDER HAS BEEN DELETED) STANDARD OFFER SERVICE - RIDER "SOS" Page ADMINISTRATIVE CREDIT - RIDER "AC" Page 44 SOS PHASE IN CREDIT/DEFERRED COST ADJUSTMENT-RIDER "SOS PIC/DCA". Page (THIS RIDER HAS BEEN DELETED) RESERVED DELIVERY CAPACITY SERVICE - RIDER "RDCS" Page BILL STABILIZATION ADJUSTMENT - RIDER "BSA" Page EMPOWER MD CHARGE - RIDER "E-MD" Page RESIDENTIAL DIRECT LOAD CONTROL-RIDER "R-DLC" Page RGGI RATE CREDIT - RIDER "RRC" Page 50 MASTER-METERED DIRECT LOAD CONTROL- RIDER "MM-DLC" Page AGGREGATE NET ENERGY METERING - RIDER "ANEM" Page NON-RESIDENTIAL DIRECT LOAD CONTROL - RIDER "NR-DLC" Page 53 DEMAND RESOURCE SURCHARGE - RIDER "DRS" Page DYNAMIC PRICING - PEAK ENERGY SAVINGS CREDIT - RIDER "DP" Page GRID RESILIENCY CHARGE - RIDER "GRC" Page n COMMUNITY NET ENERGY METERING PILOT PROGRAM "RIDER CNM" Page Date of Issue: October October Deceber

18 MD STANDARD OFFER SERVICE RIDER "SOS" EIectric--P.S.C. Md. No. 1 Sixty-TWfd-Fourth Revised Page No. 43 RIDER "SOS" - STANDARD OFFER SERVICE Available In the Maryland portion of the Copany's service area for the provision of Generation and Transission Services to custoers who do not have an alternate supplier for Generation and Transission Services as defined in the Custoer Choice Act, Section 7-510(C)(2). Standard Offer Service (SOS) Is available beginning July 1, 2004 in accordance with the provisions contained in the Maryland Case No Settleent Agreeents (Phase I and II) approved by the Maryland Public Service Coission in Order Nos and and in the Code of Maryland Regulations (COMAR) Electric Standard Offer Service. 1 1 DESCRIPTION OF SOS TYPES Residential Applicable to custoers served on Schedules 'R" and "R-TM". Custoers ay leave or return to Rider "SOS' without penalty by the Copany, subject to the Copany's General Ters and Conditions. A Custoer shall not change Type within the SOS year. Type I Non-Residential Applicable to custoers served on Schedules "GS", "T", "SL", "TN", EV", and "OL". Custoers ay leave or return to Rider "SOS" without penalty by the Copany, subject to the Copany's General Ters and Conditions. A Custoer shall not change Type within the SOS year. Type 11 Non-Residential Applicable to custoers served on Schedules "MGT LV11" and "MGT 3A11". Custoers ay leave or return to Rider "SOS" without penalty by the Copany, subject to the Copany's General Ters and Conditions. A Custoer shall not change Type within the SOS year. Hourly-Priced Service (HPS) Applicable to custoers served on Schedules "MGT LV III", "MGT 3A III", "GT LV", "GT 3A", "GT 3B" and "TM-RT". Custoers ay leave or return to Rider "SOS" without penalty by the Copany, subject to the Copany's General Ters and Conditions. When a custoer purchasing fro an alternate supplier, other than the Copany, returns or is returned to the Copany on or after June 1, 2005, the custoer will receive HPS. A Custoer shall not change Type within the SOS year. 1 i Date of Issue: August 23 October I Deceber

19 MD Sixtv-TOfd-Fourth Revised Page No MONTHLY RATE Custoers receiving Standard Offer Service will pay the Distribution Service Charge, Transission Service Charge and including all applicable riders. The Distribution Service Charges are stated in the Monthly Rates for the Custoer's applicable Rate Schedule. The Standard Offer Service Rate for each Rate Schedule within each SOS Type, including any usage incurred under associated Riders, will include the following coponents: 1. The seasonally-differentiated and, if applicable, tie-of-use differentiated load weighted average of all awarded electric supply prices for specific services in each year. 2. Retail charges designed to recover, on an aggregate basis, FERC-approved transission charges and any other PJM charges and costs incurred by Pepco. 3. An adinistrative charge (included in Generation rates shown below) 4. Residential Type I Type II Applicable taxes. $ per kwh $ per kwh $ per kwh SOS - Residential (Generation, Transission Including separately calculated GRT, and ) Schedule R ^t(wi;i7-06ri1<1»- 06;01/18-09;30/18 10/01f18-05/31/19 06/0i;i9-09;30Hfr - -{ Fora'*-^-Pighr- -rrai" $ per kwhr $ per kwhr $ per kwhr_ $ kwhr $ per kwhr $ per kwhr See for currently effective rate Schedule R-TM Generation Service i 0g/01f18-09/30;ig 10/01/18-06;31;19, kwhr $0^6830j)er k^r $ per l^r_ Interediate, _ $0J)6611_per kv^r^ _S0.0703J per kwtir_ Off Peak. $_Qj)695tj)yjy^r^ _ $0J]6608_per_k^p _$ per kwhr_ $ per kwhr $ per kwhr See for currently effective rate 06/01/19-09/30/19 $ per kwhr _ S0.05S40 per kwhr per kwhr. SOS - Type I Non-Residential (Generation, Transission including separately calculated GRT, and ) Schedules GS and EV.10/01/17-08/31/18 _ 08/01/18-09/30/18 10/01/18-05/31/19 08/01/19-09/30/19 j0.06g67 pop kwhr_ i$0.p6636^ej,kyyhr $0^066J0 per_kvr $ per kwhr. ^ Schedule T Trahsission Service Charge $ per kwhr $ per kwhr See for currently effective rate 08/01/18-09/30/18 10/01/18-08/31/19 08/01/19-09/30/19 $ per kwhr $ per kwhr $ per kwhr Vt { Foratted; Font: 8 pt Foratted: Font: 8 pt. 7(Foratted; Font; 8 pt :: 1 ^ Foratted: Font: 8 pt,'( Foratted; Font: 8 pt I Foratted: Font: 8 pt Foratted: Font: 8 pt *( Foratted: Font: 8 pt "[ Foratted: Font: 8 pt Foratted: Font: 8 pt Foratted: Font: 8 pt Foratted: Font: 8 pt $ per kwhr $ per kwhr See for currently effective rate Date of Issue: August 23 October Septeber Deceber liil

20 I MD Sixtv-Tbifd-Fourth Revised Page No MONTHLY RATE (continued) SOS - Type I Non-Residential (Generation, Transission including separately calculated GRT, and ) (continued) Schedule SL 10;01/17-06/W4S- 08/01/18-09/30/18 10/01/18-08/31/19 08/01/19-09/30/19 $ par kwhr $ per kwhr $ per kwhr $ per kwtir $ per kwhr $ per kwhr See for currently effective rate Schedule OL Mercury Vapor 175 Watt 250 Watt 400 Watt 10/01/17 08/31/18 06/01/18-09/30/18 10/01/18-08/31/19 06/01/19-09/30/ per lap 6.89 per lap per lap $ 4.51 per lap $ 6.23 per lap $ 9.56 per lap $ 4.36 per iap_ $ 3.49 per lap $ 6.02 per iap_ $ 4.82 per lap $ 9.24 per iap_ $ 7.40 per lap High Pressure Sodiu 100 Watt 150 Watt 250 Watt $ 2.86 per lap $ 4.16 per lap $ 7.01 per lap $ 2.58 per lap $ 2.49 per lap $ 2.00 per lap $ 3.76 per lap $ 3.63 per lap $ 2.91 per lap $ 6.34 per lap $ 6.12 per lap $ 4.91 per lap 175 Watt 250 Watt 400 Watt $ 0.00 per lap $ 0.00 per lap $ 0.00 per lap $ 0.00 per lap $ 0.00 per lap $ 0.00 per lap See tor currently effective rate Schedule TN and Rider SL-TN.10/01/17 08/31/18 06/01/18-09/30/18 10/01/18-08/31/19 06/01/18-09/30/18 _..... Foratted; Font: 8 pt Foratted: Font: 8 pt Kiiowatt-hour Charge ^ gar iwhr_ $ per kwhr _ J p.oeoojl gej; kwhr_ $ per kwhr Kiiowatt-hour Charge $ per kwhr $ per kwhr See for currently effective rate j --I : Font: 8 pt SOS - Type li Non-Residential (Generation, Transission Including separately calculated GRT, and ) Schedule MGT LV ii,iyotfi7 op. 03/01/18-08/31/I8-.06/01/1»-08/31/18. 09/01/1B-11/30/H.12/01/18-02/28/19 Kiiowatt-hour Charge $ par kwtir $ per kwor $ per kwtir $ per kwtir. $ per kwtir interediate $ per kwtir $ per kwhr $ per kwtir $ per kwtir $ per kwhr Off Peak $ per Kwtir $ per kwtir $ per kwtir $ per kwtir $ per kwhr Kiiowatt-hour Charge Maxiu $ per kwhr $ per kwhr $ $ per kw per kw $ per kw See for currently effective rate K: Foratted: Font: 7 pt Foratted: Font: 7 pt Foratted: Font: 7 pt Foratted: Font: 7 pt I Foratted; Font: 7 pt Date of Issue: August 23 October Septeber Decetier

21 MD Electrio-P.S.C. Md. No. 1 Sixtv-fd-Fourth Revised Page No MONTHLY RATE (continued) SOS - Type II Non-Residential (Generation, Transission Including separately calculated GRT, and ) (continued) Schedule MGT 3AII ia/i)i;i7 oaai/re o3;oi/ia-oii/3i/ia oeiiia-oa/3i;i8 o»/oina-ii/3o;ia i2/oi<ia-02/2a/i9 toioeo14 parkwhr $ per kwhr $ per kwhr $ per kwhr. $ per kwhr Interediate $ per kwhr $ perkwPr $ per kwhr $ per kwhr. $ per kwhr Off Peak $ Q.06Q14 per kwhr $ per kwhr $ per kwhr $ per kwhr. $ per kwhr $ per kwhr $ per kwhr $ per kw Maxiu $ per kw $ per kw See for currently effective rate Date of Issue: August 23 October Septeber Decetoer

22 i WM MD Electric--P.S.C. Md. No. 1 Sixtv-Tt^ifd-Fourth Revised Page No n I SOS - Hourly Priced Service (HPS) Schedules MOT LV III, MOT 3A III, GT LV, GT 3A, GT 3B, and TM-RT The Hourly Price Service will Include; 1. Market Hourly Energy Charge - The Custoer's hourly energy usage, adjusted for applicable losses, ultiplied by the hourly energy charge. The hourly energy charge will consist of the 1) hourly Integrated real tie fixed nodal weighted aggregate Locational Marginal Price (IMP) values for the Pepco zone, or its successor for the retail load served In Pepco's Maryland service area, as deterined and reported by the PJM; 2) An Adinistrative Charge of between $ and $ per kwh, any applicable taxes, and other ites as provided for in paragraphs 79 and 82 of the Phase I Settleent In Maryland Case No. 8908; and 3) Generation Ancillary Service Charges based on the previous onth's average cents per kwh generation ancillary service cost for HPS custoers in the Pepco Zone as deterined and reported by PJM. 2. Monthly Capacity Charge - Deterined by suing over each day during the Custoer's billing period the Custoer's obligation in MW ultiplied by the daily cost per MW of procuring capacity. The dally Capacity procureent cost shall be In dollars per MW-day, based on capacity purchased to cover HPS shortages and any penalties or deficiency charges and broker fees accruing for the day of the calculation. When a Custoer's account does not have interval data, the Custoer's historical data will be used to develop the hourly use. - The transission service charges stated in this SOS - Hourly Priced Service (HPS) section apply only to Type III custoers receiving HPS fro Pepco. Date of Issue; Auoust 23 October Septeber Decebrer

23 MD Sixtv4^twd-Fourth Revised Page No MONTHLY RATE (continued) SOS - Hourly Priced Service (HPS) Schedules MOT LV III, MOT 3A III, GT LV, GT 3A, GT 3B, and TM-RT (continued) Schedule MGT LV ill Maxiu $ perkwhr $ per kw $ per kw perkwhr $ per kw Schedule MGT 3A III Maxiu Schedule GT LV Maxiu Schedule GT 3A Kllowatt-hour Charge Maxiu Schedule GT 3B Kllowatt-hour Charge Maxiu $ per kwhr $ per kw $ per kw $ perkwhr $ per kw $ perkw $ per kwhr $ per kw $ per kw $ per kwhr perkw per kw $ per kwhr $ per kw $ per kwhr $ perkw $ per kwhr $ perkw $ per kwhr $ per kw Schedule TM-RT Maxiu per kwhr perkw perkw $ per kwhr $ perkw The onthly HPS charges shall equal the actual cost of providing energy and capacity supply transission service, ancillary service, and any other cost eleent directly related to the Copany's HPS load obligation, Including an Adinistrative Charge and applicable taxes. The Copany will deterine an Hourly Price Service (HPS - PCA) which will reflect the difference between the actual cost of serving Custoers under HPS (Including any cost adjustents fro the PJM Settleent syste) and the aount billed to HPS Custoers for the sae tie period. The Copany will deterine the HPS-PCA rate by dividing the HPS-PCA aount by the total kilowatt-hour sales of the then current HPS custoers. The HPS-PCA rate will be applied to each of the then current HPS custoers' sales to deterine the credit/charge for the billing onth. At the conclusion of Hourly Price Service on June 1, 2006, any HPS PCA will be returned to, or collected fro all Type 11 Custoers regardless of their supplier. Date of Issue: August 23 October t Deceber

24 MD Fiftv-BabtbNinth Revised Page No BILLING MONTHS - Billing onths of June through OctolDer - Billing onths of Noveber through May. RATING PERIODS Weekdays -(Excluding Holidays) On-Peak Period 12:00 noon Interediate Period 8:00 a.. Off-Peak Period 8:00 p.. 12:00 idnight to to and to to 8:00 p.. 12:00 noon 12:00 idnight 8:00 a.. Saturdays, Sundays and Holidays Off-Peak Period All Hours Holidays For the purpose of this tariff, holidays will be New Year's Day, Rev. Martin Luther King's Birthday, Presidents' Day, Meorial Day, Independence Day, Labor Day, Colubus Day, Veterans' Day, Thanksgiving Day and Christas Day, as designated by the Federal Governent. I BILLING DEMANDS On-Peak ( Billing Months Only) - The billing deand shall be the axiu thirty (30) inute deand recorded during the on-peak period of the billing onth. Maxiu (All Months) - The billing deand shall be the axiu thirty (30) inute deand recorded during the billing onth. PROCUREMENT COST ADJUSTMENT In addition to the Standard Offer Service rates shown above, for Residential, Type I, and Type II custoers (excludes HPS custoers) there will be a onthly (PCA) shown as a separate line Ite on the Custoer's bill. Refer to HPS for the Hourly Priced Service Procureent Cost Adjustent (HPS-PCA). The PCA Is a $ per kilowatt-hour rate applied to the Custoer's billed kilowatt-hours. The PCA Is an adjustent ade In order to true-up the rates custoers are billed to reflect the Copany's actual costs of providing Standard Offer Service. A true-up adjustent will be ade to the PCA at least three (3) ties per year- effective with the June, Noveber and February billing onths. These true-ups will revise the PCA based on actual and forecasted collections of SOS revenues by SOS Type and the actual and forecasted cost of providing Standard Offer Service. The current applicable PCA rate by SOS Type is available on the Copany's website at wvw.peoco.co. PUBLICATION OF PRICES The Standard Offer Service Rates shown In this Rider are posted on the Copany's website at The arket hourly Locatlonal Marginal Prices used for HPS are available on the PJM website at Date of Issue: Auoust 23 October Septeber Deceber