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~ pepco. Matthew K. Segers Assistant General Counsel EP1120 701 Ninth Street NW Washington. DC 20068-0001 Office 202 872.3484 Fax 202 331.6767 pepco.com mksegers@pepcoholdings.com An Exelon Company January 29, 2018 David J. Collins Executive Secretary Public Service Commission of Maryland William Donald Schaefer Tower 6 St. Paul Street, 16th Floor Baltimore, MD 21202-6808 Re: Case Nos. 9056/9064 Dear Mr. Collins: Enclosed for filing are an original and seventeen (17) copies (five three-hole punched) of Potomac Electric Power Company's Rider "SOS" - Standard Offer Service. Rider "SOS" has been updated to reflect SOS rates for Type II Customers effective March 1, 2018 through May 31, 2018. The bid rates were approved in Order No. 88543. Enclosure cc: All Parties of Record

PROPOSED

One Hundred and Thirty-Fifth Revised Page No. 1 RATE SCHEDULES FOR ELECTRIC SERVICE IN MARYLAND POTOMAC ELECTRIC POWER COMPANY pe An Exelon Company RATES AND REGULATORY PRACTICES GROUP Date of Issue: January 29, 2018 March 1, 2018

One Hundred and Thirty-Fifth Revised Page No. 2 TABLE OF CONTENTS RATE SCHEDULES RESIDENTIAL SERVICE - SCHEDULE "R".... TIME METERED RESIDENTIAL SERVICE - SCHEDULE "R-TM".... GENERAL SERVICE - SCHEDULE "GS".... TEMPORARY SERVICE-SCHEDULE "T".... TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE II SCHEDULE "MGT LV 11 11 TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE II A SCHEDULE "MGT LV II A" (THIS SCHEDULE HAS BEEN DELETED).... TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE Ill SCHEDULE "MGT LV Ill".... TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE II SCHEDULE "MGT 3A 11 11 TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE II A SCHEDULE "MGT 3A II A" (THIS SCHEDULE HAS BEEN DELETED).... TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE Ill SCHEDULE "MGT 3A 111 11 TIME METERED GENERAL SERVICE - LOW VOLTAGE - SCHEDULE "GT LV'.... TIME METERED GENERAL SERVICE - PRIMARY SERVICE - SCHEDULE "GT 3A".... TIME METERED GENERAL SERVICE- HIGH VOLTAGE - SCHEDULE "GT 3B".... TIME METERED RAPID TRANSIT SERVICE - SCHEDULE "TM-RT".... ELECTRIC VEHICLE SERVICE - SCHEDULE "EV'.... (THIS SCHEDULE IS CLOSED TO NEW CUSTOMERS) OUTDOOR LIGHTING SERVICE - SCHEDULE "OL".... STREET LIGHTING SERVICE - SCHEDULE "SL".... SERVICING STREET LIGHTS SERVED FROM OVERHEAD LINES - SCHEDULE "SSL-OH".... Page 3-3.1 Page 4-4.1 Page 5-5.1 Page 6-6.1 Page 7-7.2 Page 7.3-7.5 Page 7.6-7.8 Page 8-8.2 Page 8.2-8.5 Page 8.6-8.8 Page 9-9.2 Page 10-10.2 Page 11-11.2 Page 12-12.1 Page 13-13.1 Page 14-14.1 Page 15-15.1 Page 16-16.2 SERVICING STREET LIGHTS SERVED FROM UNDERGROUND LINES - SCHEDULE "SSL-UG"... Page 17-17.2 Date of Issue: January 29, 2018 March 1, 2018

One Hundred and Thirty-Fifth Revised Page No. 2.1 SERVICING STREET LIGHTS SERVED FROM OVERHEAD LINES - SCHEDULE "SSL-OH-LED"... Page 17.3-17.5 SERVICING STREET LIGHTS SERVED FROM UNDERGROUND LINES - SCHEDULE "SSL-UG-LED"... Page 17.6-17.8 TELECOMMUNICATIONS NETWORK SERVICE - SCHEDULE "TN"... Page 18-18.1 COGENERATION AND SMALL POWER PRODUCTION INTERCONNECTION SERVICE- SCHEDULE "CG-SPP" PURCHASE OF POWER... Page 19-19.4 STANDBY SERVICE - SCHEDULE "S"... Page 20-20.1 PLUG-IN VEHICLE CHARGING - SCHEDULE "PIV"............ Page 21-21.1 RESIDENTIAL SERVICE - PLUG-IN VEHICLE CHARGING - SCHEDULE "R-PIV"... Page 22-22.1 COMMUNITY SOLAR PILOT PROGRAM - SCHEDULE "CS".................................. Page 23-23.6 RESERVED FOR FUTURE USE... Page 24-26 RIDERS MARKET PRICE SERVICE - RIDER "MPS"... Page 27-27.1 (THIS RIDER HAS BEEN DELETED) UNIVERSAL SERVICE CHARGE RECOVERY - RIDER "USC"... Page 28 GENERATION PROCUREMENT CREDIT - RIDER "GPC"... Page 29-29.1 (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 31-31.3 EXPERIMENTAL CONJUNTIVE BILLING SERVICE- RIDER "CBS"... Page 32-32.1 (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 "OT"... Page 36 MONTGOMERY COUNTY SURCHARGE - RIDER "MCS"... Page 37 MARYLAND ENVIRONMENTAL SURCHARGE - RIDER "MES"... Page 38 Date of Issue: January 29, 2018 March 1, 2018

One Hundred and Second 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 40-40.2 EXCESS FACILITIES - RIDER "EF"... Page 41 DIVESTITURE SHARING CREDIT- RIDER "OS"... Page 42 (THIS RIDER HAS BEEN DELETED) STANDARD OFFER SERVICE - RIDER "SOS"... Page 43-43.6 ADMINISTRATIVE CREDIT - RIDER "AC"... Page 44 SOS PHASE IN CREDIT/DEFERRED COST ADJUSTMENT-RIDER "SOS PIC/DCA". Page 45-45.1 (THIS RIDER HAS BEEN DELETED) RESERVED DELIVERY CAPACITY SERVICE - RIDER "RDCS"............................ Page 46-46.1 BILL STABILIZATION ADJUSTMENT- RIDER "BSA"... Page 47-47.1 EMPOWER MD CHARGE - RIDER "E-MD"....................................................... Page 48-48.1 RESIDENTIAL DIRECT LOAD CONTROL - RIDER "R-DLC"................................. Page 49-49.1 RGGI RATE CREDIT- RIDER "RRC"... Page 50 MASTER-METERED DIRECT LOAD CONTROL- RIDER "MM-DLC"... Page 51-51.1 AGGREGATE NET ENERGY METERING - RIDER "ANEM"................................. Page 52-52.4 NON-RESIDENTIAL DIRECT LOAD CONTROL - RIDER "NR-DLC"........................ Page 53 DEMAND RESOURCE SURCHARGE - RIDER "DRS".......................................... Page 54-54.1 DYNAMIC PRICING - PEAK ENERGY SAVINGS CREDIT - RIDER "DP"................. Page 55-55.1 GRID RESILIENCY CHARGE - RIDER "GRC"..................................................... Page 56-56.1 COMMUNITY NET ENERGY METERING PILOT PROGRAM "RIDER CNM"..... Page 57-57.1 Date of Issue: January 29, 2018 March 1, 2018

Sixty-First Revised Page No. 43 STANDARD OFFER SERVICE RIDER "SOS" RIDER "SOS" -STANDARD OFFER SERVICE Available in the Maryland portion of the Company's service area for the provision of Generation and Transmission Services to customers who do not have an alternate supplier for Generation and Transmission Services as defined in the Customer 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. 8908 Settlement Agreements (Phase I and II) approved by the Maryland Public Service Commission in Order Nos. 78400 and 78710 and in the Code of Maryland Regulations (COMAR) 20.52 Electric Standard Offer Service. DESCRIPTION OF SOS TYPES Residential Applicable to customers served on Schedules "R" and "R-TM". Customers may leave or return to Rider "SOS" without penalty by the Company, subject to the Company's General Terms and Conditions. A Customer shall not change Type within the SOS year. Type I Non-Residential Applicable to customers served on Schedules "GS", "T", "SL", "TN", "EV", and "OL". Customers may leave or return to Rider "SOS" without penalty by the Company, subject to the Company's General Terms and Conditions. A Customer shall not change Type within the SOS year. Type II Non-Residential Applicable to customers served on Schedules "MGT LV II" and "MGT 3A II". Customers may leave or return to Rider "SOS" without penalty by the Company, subject to the Company's General Terms and Conditions. A Customer shall not change Type within the SOS year. Hourly-Priced Service (HPS) Applicable to customers served on Schedules "MGT LV Ill", "MGT 3A Ill", "GT LV", "GT 3A", "GT 38" and "TM-RT". Customers may leave or return to Rider "SOS" without penalty by the Company, subject to the Company's General Terms and Conditions. When a customer purchasing from an alternate supplier, other than the Company, returns or is returned to the Company on or after June 1, 2005, the customer will receive HPS. A Customer shall not change Type within the SOS year. Date of Issue: January 29, 2018 March 1, 2018

Sixty-First Revised Page No. 43.1 MONTHLY RA TE Customers receiving Standard Offer Service will pay the Distribution Service Charge, Transmission Service Charge and including all applicable riders. The Distribution Service Charges are stated in the Monthly Rates for the Customer'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 components: 1. The seasonally-differentiated and, if applicable, time-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, FERG-approved transmission charges and any other PJM charges and costs incurred by Pepco. 3. An administrative charge (included in Generation rates shown below) Residential $0.00400 per kwh Type I $0.00550 per kwh Type II $0.00600 per kwh 4. Applicable taxes. SOS - Residential (Generation, Transmission including separately calculated GRT, and ) Schedule R 06/01/17-09/30/17 $ 0.07263 per kwhr 10/01/17-05/31/18 $ 0.06989 per kwhr 06/01118-09/30/18 $0.06530 per kwhr Schedule R-TM On Peak Intermediate Off Peak $0.00869 per kwhr $ 0.00869 per kwhr 06/01117-09/30/17 10/01/17-05/31/18 06/01/18-09130/18 $0.07617 per kwhr $0.07213 per kwhr $0.07080 per kwhr $ 0.07067 per kwhr $ 0.07022 per kwhr $ 0.06954 per kwhr $0.00872 per kwhr $0.00872 per kwhr $0.06830 per kwhr $0.06511 per kwhr $0.06608 per kwhr SOS - Type I Non-Residential (Generation, Transmission including separately calculated GRT, and ) Schedules GS and EV 06/01117-09/30/17 10/01/17-05/31/18 06/01/18-09/30/18 $0.07241 per kwhr $0.06967 per kwhr $0.06636 kwhr $0.00635 per kwhr $0.00635 per kwhr Schedule T 06/01117-09/30/17 10/01/17-05/31/18 06/01 /18-09/30/18 $0.07241 per kwhr $0.06967 per kwhr $0.06636 per kwhr $0.00426 per kwhr $0.00426 per kwhr Date of Issue: January 29, 2018 March 1, 2018

Sixty-First Revised Page No. 43.2 MONTHLY RATE (continued) SOS -Type' I Non-Residential(Generation, Transmission including separately calculated GRT, a.nd Procurement CostAdjustment) (continued) Schedule SL 06/01117-09/30/17 10/01/17-05/31/18 06/01/18-09/30/18 $0.06742 per kwhr $0.06790 per kwhr $0.06140 per kwhr $ 0.00000 per kwhr $ 0.00000 per kwhr Schedule OL Mercury Vapor 175 Watt 250 Watt 400 Watt High Pressure Sodium 100 Watt 150 Watt 250 Watt 175 Watt 250 Watt 400 Watt Schedule TN and Rider SL-TN 06/01117-09/30/17 10/01/17-05/31/18 06/01118-09/30/18 $ 4.96 per lamp $ 4.99 per lamp $ 4.51 per lamp $ 6.84 per lamp $ 6.89 per lamp $ 6.23 per lamp $ 10.50 per lamp $ 10.58 per lamp $ 9.56 per lamp $ 2.83 per lamp $ 2.85 per lamp $ 2.58 per lamp $ 4.13 per lamp $ 4.16 per lamp $ 3. 76 per lamp $ 6.96 per lamp $ 7.01 per lamp $ 6.34 per lamp $ 0.00 per lamp $ 0.00 per lamp $ 0.00 per lamp $ 0.00 per lamp $ 0.00 per lamp $ 0.00 per lamp 06/01117-09/30/17 10/01 /17-05/31 /18 06/01118-09/30/18 $ 0.07106 per kwhr $ 0.06882 per kwhr $ 0.06277 per kwhr $ 0.00416 per kwhr $ 0.00416 per kwhr SOS - Type II Non~Residential (Generation, Transmission including separately calculated GRT, and. ) Schedule MGT LV II 06/01/17-08/31/17 09/01/17-11/30/17 12/01/17-02128/18 03/01/18-05/31/18 On Peak Intermediate Off Peak $ 0.06284 per kwhr $0.06089 per kwhr $ 0.06973 per kwhr $0.06442 per kwhr $ 0.06284 per kwhr $0.05696 per kwhr $ 0.06973 per kwhr $0.06534 per kwhr $ 0.06284 per kwhr $0.05572 per kwhr $ 0.06973 per kwhr $0.06309 per kwhr On Peak Maximum $0.00371 per kwhr $0.00371 per kwhr $ 0.9672 per kw $ 0.5353 per kw $ 0.5353 per kw Date of Issue: January 29, 2018 March 1, 2018

Sixty-First Revised Page No. 43.3 MONTHLY RATE (continued) SOS - Jype)I Non~Residential (Generation, Transmission including separately calculated GRT, and Procurement ~ost Adjustment) (continued). Schedule MGT 3A II 06101117-08131117 09101117-11/30117 12/01117-02128118 03101118-05131/18 On Peak Intermediate Off Peak $0.06231 per kwhr $ 0.06038 per kwhr $0.06231 per kwhr $ 0.05649 per kwhr $0.06231 per kwhr $ 0.05526 per kwhr $ 0.06914 per kwhr $ 0.06914 per kwhr $ 0.06914 per kwhr $ 0.00382 per kwhr $ 0.00382 per kwhr On Peak $ 0.9800 per kw Maximum $ 0.5488 per kw $ 0.5488 per kw $0.06388 per kwhr $0.06478 per kwhr $0.06255 per kwhr Date of Issue: January 29, 2018 March 1, 2018

Sixty-First Revised Page No. 43.4 SOS'"'" Hourly Priced Service (HPS) Schedules MGT LV Ill,. MGT 3Alll, GT LV, GT 3A 1 GT 38, and TM-RT. The Hourly Price Service will include: 1. Market Hourly Energy Charge - The Customer's hourly energy usage, adjusted for applicable losses, multiplied by the hourly energy charge. The hourly energy charge will consist of the 1) hourly integrated real time 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 determined and reported by the PJM; 2) An Administrative Charge of between $0.00225 and $0.00300 per kwh, any applicable taxes, and other items as provided for in paragraphs 79 and 82 of the Phase I Settlement in Maryland Case No. 8908; and 3) Generation Ancillary Service Charges based on the previous month's average cents per kwh generation ancillary service cost for HPS customers in the Pepco Zone as determined and reported by PJM. 2. Monthly Capacity Charge - Determined by summing over each day during the Customer's billing period the Customer's obligation in MW multiplied by the daily cost per MW of procuring capacity. The daily Capacity procurement 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 Customer's account does not have interval data, the Customer's historical data will be used to develop the hourly use. - The transmission service charges stated in this SOS - Hourly Priced Service (HPS) section apply only to Type Ill customers receiving HPS from Pepco. Date of Issue: January 29, 2018 March 1, 2018

Sixty-First Revised Page No. 43.5 MONTHLY RATE (continued) sos~ Hourly Priced Servic.e (HPS).......... Schedules MG"[LV.111, MGT 3A Ill, GT LV 1 GT 3A, GT 38, and TM~RT (continued) Schedule MGT L V Ill $ 0.00371 per kwhr $ 0.00371 per kwhr On Peak $ 0.9672 per kw Maximum $ 0.5353 per kw $ 0.5353 per kw Schedule MGT 3A Ill $ 0.00382 per kwhr $ 0.00382 per kwhr On Peak $ 0.9800 per kw Maximum $ 0.5488 per kw $ 0.5488 per kw Schedule GT LV $ 0.00344 per kwhr $ 0.00344 per kwhr On Peak $ 1.0629 per kw Maximum $ 0.6139 per kw $ 0.6139 per kw Schedule GT 3A $ 0.00321 per kwhr $ 0.00321 per kwhr On Peak $ 1.0098 per kw Maximum $ 0.5885 per kw $ 0.5885 per kw Schedule GT 38 $ 0.00291 per kwhr $ 0.00291 per kwhr On Peak $ 0.9114 per kw Maximum $ 0.4998 per kw $ 0.4998 per kw Schedule TM-RT $ 0.00304 per kwhr $ 0.00304 per kwhr On Peak $ 0.6540 per kw Maximum $ 0.3306 per kw $ 0.3306 per kw The monthly HPS charges shall equal the actual cost of providing energy and capacity supply transmission service, ancillary service, and any other cost element directly related to the Company's HPS load obligation, including an Administrative Charge and applicable taxes. The Company will determine an Hourly Price Service (HPS - PCA) which will reflect the difference between the actual cost of serving Customers under HPS (including any cost adjustments from the PJM Settlement system) and the amount billed to HPS Customers for the same time period. The Company will determine the HPS-PCA rate by dividing the HPS-PCA amount by the total kilowatt-hour sales of the then current HPS customers. The HPS-PCA rate will be applied to each of the then current HPS customers' sales to determine the credit/charge for the billing month. At the conclusion of Hourly Price Service on June 1, 2006, any HPS PCA will be returned to, or collected from all Type II Customers regardless of their supplier. Date of Issue: January 29, 2018 March 1, 2018

Fifty-Sixth Revised Page No. 43.6 BILLING MONTHS - Billing months of June through October - Billing months of November through May. RA TING PERIODS Weekdays - (Excluding Holidays) On-Peak Period 12:00 noon Intermediate Period 8:00 a.m. Off-Peak Period 8:00 p.m. 12:00 midnight Saturdays, Sundays and Holidays Off-Peak Period All Hours to to and to to 8:00 p.m. 12:00 noon 12:00 midnight 8:00 a.m. Holidays For the purpose of this tariff, holidays will be New Year's Day, Rev. Martin Luther King's Birthday, Presidents' Day, Memorial Day, Independence Day, Labor Day, Columbus Day, Veterans' Day, Thanksgiving Day and Christmas Day, as designated by the Federal Government. BILLING DEMANDS On-Peak ( Billing Months Only) - The billing demand shall be the maximum thirty (30) minute demand recorded during the on-peak period of the billing month. Maximum (All Months) - The billing demand shall be the maximum thirty (30) minute demand recorded during the billing month. PROCUREMENT COST ADJUSTMENT In addition to the Standard Offer Service rates shown above, for Residential, Type I, and Type II customers (excludes HPS customers) there will be a monthly (PCA) shown as a separate line item on the Customer's bill. Refer to HPS for the Hourly Priced Service Procurement Cost Adjustment (HPS-PCA). The PCA is a $ per kilowatt-hour rate applied to the Customer's billed kilowatt-hours. The PCA is an adjustment made in order to true-up the rates customers are billed to reflect the Company's actual costs of providing Standard Offer Service. A true-up adjustment will be made to the PCA at least three (3) times per year- effective with the June, November and February billing months. 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 Company's website at www.pepco.com. PUBLICATION OF PRICES The Standard Offer Service Rates shown in this Rider are posted on the Company's website at www.pepco.com. The market hourly Locational Marginal Prices used for HPS are available on the PJM website at www.pjm.com. Date of Issue: January 29, 2018 March 1, 2018

REDLINE

One Hundred and Thirty~Fifth Revised Page No. 1 RATE SCHEDULES FOR ELECTRIC SERVICE IN MARYLAND POTOMAC ELECTRIC POWER COMPANY An Exelon Company RATES AND REGULATORY PRACTICES GROUP Date of Issue: January 4;~ 2018 Ootober 20, 2Q4.7March 1, 2018

One Hundred and Thirty..fiMtR-Fifth Revised Page No. 2 TABLE OF CONTENTS RA TE SCHEDULES RESIDENTIAL SERVICE - SCHEDULE "R".... TIME METERED RESIDENTIAL SERVICE - SCHEDULE "R-TM"..... GENERAL SERVICE - SCHEDULE "GS"..... TEMPORARY SERVICE - SCHEDULE "T".... TIME METERED MEDIUM GENERAL SERVICE- LOW VOLTAGE - TYPE 11 SCHEDULE "MGT LV 11".... TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE 11 A SCHEDULE "MGT LV II A" (THIS SCHEDULE HAS BEEN DELETED)..... TIME METERED MEDIUM GENERAL SERVICE- LOW VOLTAGE-TYPE 111 SCHEDULE "MGT LV 111".... TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE II SCHEDULE "MGT 3A 11".... TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE II A SCHEDULE "MGT 3A II A" (THIS SCHEDULE HAS BEEN DELETED)..... TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE Ill SCHEDULE "MGT 3A Ill".... TIME METERED GENERAL SERVICE- LOW VOLTAGE- SCHEDULE "GT LV".... TIME METERED GENERAL SERVICE - PRIMARY SERVICE - SCHEDULE "GT 3A".... TIME METERED GENERAL SERVICE - HIGH VOLTAGE - SCHEDULE "GT 3B".... TIME METERED RAPID TRANSIT SERVICE - SCHEDULE "TM-RT"..... ELECTRIC VEHICLE SERVICE- SCHEDULE "EV".... (THIS SCHEDULE IS CLOSED TO NEW CUSTOMERS) OUTDOOR LIGHTING SERVICE - SCHEDULE "OL".... STREET LIGHTING SERVICE - SCHEDULE "SL".... SERVICING STREET LIGHTS SERVED FROM OVERHEAD LINES - SCHEDULE "SSL-OH".... Page 3-3.1 Page 4-4.1 Page 5-5.1 Page 6-6.1 Page 7-7.2 Page 7.3-7.5 Page 7.6-7.8 Page 8-8.2 Page 8.2-8.5 Page 8.6-8.8 Page 9-9.2 Page 10-10.2 Page 11-11.2 Page 12-12.1 Page 13-13.1 Page 14-14.1 Page 15-15.1 Page 16-16.2 SERVICING STREET LIGHTS SERVED FROM UNDERGROUND LINES - SCHEDULE "SSL-UG"... Page 17-17.2 Date of Issue: January 4,~ 2018 Oolober 20, 2G47March 1, 2018

One Hundred and Thirty-fiM!R-Fifth Revised Page No. 2.1 SERVICING STREET LIGHTS SERVED FROM OVERHEAD LINES - SCHEDULE 'SSL-OH-LED"... Page 17.3-17.5 SERVICING STREET LIGHTS SERVED FROM UNDERGROUND LINES- SCHEDULE 'SSL-UG-LED"... Page 17.6-17.8 TELECOMMUNICATIONS NETWORK SERVICE - SCHEDULE "TN"... Page 18-18.1 COGENERATION AND SMALL POWER PRODUCTION INTERCONNECTION SERVICE - SCHEDULE "CG-SPP" PURCHASE OF POWER... Page 19-19.4 STANDBY SERVICE - SCHEDULE "S"... Page 20-20.1 PLUG-IN VEHICLE CHARGING- SCHEDULE 'PIV"..................... Page 21-21.1 RESIDENTIAL SERVICE - PLUG-IN VEHICLE CHARGING - SCHEDULE "R-PIV"... Page 22-22.1 COMMUNITY SOLAR PILOT PROGRAM- SCHEDULE 'CS"... Page 23-23.6 RESERVED FOR FUTURE USE... Page 24-26 RIDERS MARKET PRICE SERVICE - RIDER "MPS"... Page 27-27.1 (THIS RIDER HAS BEEN DELETED) UNIVERSAL SERVICE CHARGE RECOVERY - RIDER "USC"... Page 28 GENERATION PROCUREMENT CREDIT - RIDER "GPC"... Page 29-29.1 (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 31-31.3 EXPERIMENTAL CONJUNTIVE BILLING SERVICE - RIDER 'CBS"... Page 32-32.1 (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 "OT"... Page 36 MONTGOMERY COUNTY SURCHARGE RIDER "MCS"... Page 37 MARYLAND ENVIRONMENTAL SURCHARGE RIDER "MES"... Page 38 Date of Issue: January 4;~ 2018 Ootober 20, 2Q.:l+March 1, 2018

One Hundred and Rfst-Second Revised Page No. 2.2 TEMPORARY TAX COMPLIANCE SURCHARGE - RIDER "TICS"... Page 39 (THIS RIDER HAS BEEN DELETED) OPTIONAL METER EQUIPMENT RELATED SERVICES - RIDER "OMRS"......... Pages 40-40.2 EXCESS FACILITIES - RIDER "EF"... Page 41 DIVESTITURE SHARING CREDIT - RIDER "DS"... Page 42 (THIS RIDER HAS BEEN DELETED) STANDARD OFFER SERVICE - RIDER "SOS'... Page 43-43.6 ADMINISTRATIVE CREDIT - RIDER "AC'... Page 44 SOS PHASE IN CREDIT/DEFERRED COST ADJUSTMENT-RIDER "SOS PIC/DCA'. Page 45-45.1 (THIS RIDER HAS BEEN DELETED) RESERVED DELIVERY CAPACITY SERVICE- RIDER "RDCS'... Page 46-46.1 BILL STABILIZATION ADJUSTMENT- RIDER "BSA"... Page 47-47.1 EMPOWER MD CHARGE- RIDER "E-MD".......................................... Page 48-48.1 RESIDENTIAL DIRECT LOAD CONTROL- RIDER "R-DLC'............... Page 49-49.1 RGGI RATE CREDIT- RIDER 'RRC'.................. Page 50 MASTER-METERED DIRECT LOAD CONTROL- RIDER "MM-DLC'... Page 51-51.1 AGGREGATE NET ENERGY METERING- RIDER "ANEM'..................... Page 52-52.4 NON-RESIDENTIAL DIRECT LOAD CONTROL- RIDER "NR-DLC"............ Page 53 DEMAND RESOURCE SURCHARGE - RIDER "DRS'................................. Page 54-54.1 DYNAMIC PRICING- PEAK ENERGY SAVINGS CREDIT- RIDER "DP'... Page 55-55.1 GRID RESILIENCY CHARGE - RIDER "GRC'................................... Page 56-56.1 COMMUNITY NET ENERGY METERING PILOT PROGRAM "RIDER CNM'...... Page 57-57.1 Date of Issue: January 4,~ 2018 Oolober 20, 204-7March 1, 2018

Silffie#l-Sixty-First Revised Page No. 43 STANDARD OFFER SERVICE RIDER "SOS" RIDER "SOS" - STANDARD OFFER SERVICE Available in the Maryland portion of the Company's service area for the provision of Generation and Transmission Services to customers who do not have an alternate supplier for Generation and Transmission Services as defined in the Customer Choice Act, Section 7-51 O(C)(2). Standard Offer Service (SOS) is available beginning July 1, 2004 in accordance with the provisions contained in the Maryland Case No. 8908 Settlement Agreements (Phase I and II) approved by the Maryland Public Service Commission in Order Nos. 78400 and 78710 and in the Code of Maryland Regulations (COMAR) 20.52 Electric Standard Offer Service. DESCRIPTION OF SOS TYPES Residential Applicable to customers served on Schedules "R" and "R-TM". Customers may leave or return to Rider "SOS" without penalty by the Company, subject to the Company's General Terms and Conditions. A Customer shall not change Type within the SOS year. Type I Non-Residential Applicable to customers served on Schedules "GS', "T", "SL", "TN", "EV", and "OL". Customers may leave or return to Rider "SOS" without penalty by the Company, subject to the Company's General Terms and Conditions. A Customer shall not change Type within the SOS year. Type II Non-Residential Applicable to customers served on Schedules "MGT LV II" and "MGT 3A II'. Customers may leave or return to Rider "SOS" without penalty by the Company, subject to the Company's General Terms and Conditions. A Customer shall not change Type within the SOS year. Hourly-Priced Service (HPS) Applicable to customers served on Schedules "MGT LV Ill", "MGT 3A Ill", "GT LV', "GT 3A", "GT 38" and "TM-RT". Customers may leave or return to Rider "SOS" without penalty by the Company, subject to the Company's General Terms and Conditions. When a customer purchasing from an alternate supplier, other than the Company, returns or is returned to the Company on or after June 1, 2005, the customer will receive HPS. A Customer shall not change Type within the SOS year. Date of Issue: November ;io, 2017January 29 2018 December 1, 2017 March 1, 2018

SOOietR-Sixty-First Revised Page No. 43.1 MONTHLY RA TE Customers receiving Standard Offer Service will pay the Distribution Service Charge, Transmission Service Charge and including all applicable riders. The Distribution Service Charges are stated in the Monthly Rates for the Customer'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 components: 1. The seasonally-differentiated and, if applicable, time-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, FERG-approved transmission charges and any other PJM charges and costs incurred by Pepco. 3. An administrative charge (included in Generation rates shown below) Residential $0.00400 per kwh Type I $0.00550 per kwh Type II $0.00600 per kwh 4. Applicable taxes. SOS' - R~sidential (Generation, ) Schedule R Schedule R-TM On Peak Intermediate Off Peak Transmission including separately calculated GRT, and. 06/01/17--09/30/17 $ 0.07263 per kwhr 10/01/17-05/31/18 $ 0.06989 per kwhr $0.00869 per kwhr $ 0.00869 per kwhr 06/01/18-09/30/18 $0.06530 per kwhr 06/01 /17--09/30/17 10/01/17-05/31/18 06/01/18-09/30/18 $0.07617 per kwhr $0.07213 per kwhr $0.07080 per kwhr S 0.07067 per kwhr $ 0.07022 per kwhr $ 0.06954 per kwhr $0.00872 per kwhr $0.00872 per kwhr $0.06830 per kwhr $0.06511 per kwhr $0.06608 per kwhr SOS - rype I Non-Residential (Generation, Transmissi<>n including separately c.alculated GRT, and Procurement Cost.Adjustment) Schedules GS and EV 06101117--09/30/17 10/01/17-05/31118 06/01/18. 09130/18 $0.07241 per kwhr $0.06967 per kwhr $0.06636 kwhr $0.00635 per kwhr $0.00635 per kwhr Schedule T 06/01117--09/30117 10101/17-05/31/18 06/01/18. 09/30/18 $0.07241 per kwhr $0.06967 per kwhr $0.06636 per kwhr $0.00426 per kwhr $0.00426 per kwhr Date of Issue: November 30, 2017Januarv 29, 2018 December 1, 2017 March 1, 2018

SOOietR-Sixty-First Revised Page No. 43.2 MONTHLY RATE (continued) SOS:... Type I Non~Residential (Generation, Transmission including separately calculated GRT, and ) (continued) Schedule SL 06/01117-09130117 10/01/17-05131118 06/01/18-09/30/18 $0.06742 per kwhr $0.06790 per kwhr $0.06140 per kwhr $ 0.00000 per kwhr $ 0.00000 per kwhr Schedule OL Mercury Vapor 175Watt 250Watt 400Watt High Pressure Sodium 100Watt 150Watt 250Watt 175Watt 250Watt 400Watt Schedule TN and Rider SL-TN Kiiowatt-hour Charge 06/01/17-09130/17 10101117-05/31/18 06101/18-09/30/18 $ 4.96 per lamp $ 4.99 per lamp $ 4.51 per lamp $ 6.84 per lamp $ 6.89 per lamp $ 6.23 per lamp $ 10.50 per lamp $ 10.58 per lamp $ 9.56 per lamp $ 2.83 per lamp $ 2.85 per lamp $ 2.58 per lamp $ 4.13perlamp $ 4.16 per lamp $ 3.76 per lamp $ 6.96 per lamp $ 7.01 per lamp $ 6.34 per lamp $ 0.00 per lamp $ o.oo per lamp $ 0.00 per lamp $ o.oo per lamp $ 0.00 per lamp $ 0.00 per lamp 06/01/17-09130/17 10101/17-05/31118 06101/18-09130118 $ 0.07106 per kwhr $ 0.06882 per kwhr $ 0.06277 per kwhr $ 0.00416 per kwhr S 0.00416 per kwhr sos - Type n Non-Residential (Generation, Transmission including separately calculated GRT; and Procurement C.ost Adjustment).. Schedule MGT LV II 03101111 06131.'17 os101111-08/31/17 09101111-11130111 02101111.02128/18 03/01118.QS/31/18 On Peak ~--S 0.06284 per kwhr $0.06089 per kwhr $0.06973 per kwllf- SO 05442 per kwbr lntennediate S0.06712 per '"""r s 0.06284 per kwhr S0.05696 per kwhr $ 0.06973 per kwhr so 06534 per kwhr Off Peak S0.06263 per lo.or S 0.06284 per kwhr $0.05572 per kwhr S0.06973 per kwhr SO 06309 per kwhr +------{Formatted: Indent: Left: O", Flrstllne: 0" On Peak Maximum $0.00371 per kwhr $0.00371 per kwhr $ O.9672 per kw $ 0.5353 per kw $ 0.5353 per kw Date of Issue: November :30, 2017Januarv 29, 2018 Deoember 1, 2017 March 1. 2018

SOOietA--Sixty-First Revised Page No. 43.3 MONTHLY RATE (continued) SOS - Type II Non-Residential (Generation, Transmission including separately calculated GRT, and ) (continued) Schedule MGT 3A II ~~+ 06/01/17-08/31/17 09/01/17-11/30/17 12/01/17-02/28/18 p3!01/18-05/31/18...-----{ Formatted: Underline '--------------------' On Peak $ 0.0@ per l1wfif $0.06231 per kwhr $ 0.06038 per kwhr $ 0.06914 per kwhr $,Q.06388 Rer kwhr -------- Formatted: Underline lntermediat~@ per 11whr $0.06231 perkwhr $ 0.05649 perkwhr $ 0.06914 per kwhr $,Q.06478 per kwhr... ~Fo;.;r.;,;m;.;a;.;.tt;.;ed;;;.;..:.;;,U;.;;nd;.;.e;;.;rl;;.;in.;;,e...( Off Peak ~hf-$0.06231 per kwhr $ 0.05526 per kwhr $ 0.06914 per kwhr S0.06255 prer kwhr >====================< Formatted: Underline $ 0.00382 per kwhr $ 0.00382 per kwhr On Peak $ 0.9800 per kw Maximum $ 0.5488 per kw $ 0.5488 per kw Date of Issue: November 30, 2017Januarv 29, 2018 December 1, 2017 March 1, 2018

SOOietA-Sixth-First Revised Page No. 43.4 SQS - Hourly' priced Service (HI'S).. Schedules MGT LV Ill, MGT 3Alll, GT LV; GT3A, GT 38,and TM~RT The Hourly Price Service will include: 1. Market Hourly Energy Charge - The Customer's hourly energy usage, adjusted for applicable losses, multiplied by the hourly energy charge. The hourly energy charge will consist of the 1) hourly integrated real time 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 determined and reported by the PJM; 2) An Administrative Charge of between $0.00225 and $0.00300 per kwh, any applicable taxes, and other items as provided for in paragraphs 79 and 82 of the Phase I Settlement in Maryland Case No. 8908; and 3) Generation Ancillary Service Charges based on the previous month's average cents per kwh generation ancillary service cost for HPS customers in the Pepco Zone as determined and reported by PJM. 2. Monthly Capacity Charge - Determined by summing over each day during the Customer's billing period the Customer's obligation in MW multiplied by the daily cost per MW of procuring capacity. The daily Capacity procurement 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 Customer's account does not have interval data, the Customer's historical data will be used to develop the hourly use. - The transmission service charges stated in this SOS - Hourly Priced Service (HPS) section apply only to Type Ill customers receiving HPS from Pepco. Date of Issue: No 1ember 30, 2017Januarv 29 2018 Qesemaer 1, 2017 March 1, 2018

SOOie#l-Sixty-First Revised Page No. 43.5 MONTHLY RATE (continued) sos- Hourly)>riced Service (HPS)......... Schedules MGT LY Ill, MGT 3A Ill, GT LV; GT 3A, GT 36, and TM RT (continued) Schedule MGT LV Iii $ 0.00371 per kwhr $ 0.00371 per kwhr On Peak $ 0.9672 per kw Maximum $ 0.5353 per kw $ 0.5353 per kw Schedule MGT 3A Iii $ 0.00382 per kwhr $ 0.00382 per kwhr On Peak $ 0.9800 per kw Maximum $ 0.5488 per kw $ 0.5488 per kw Schedule GT LV $ 0.00344 per kwhr $ 0.00344 per kwhr On Peak $ 1.0629 per kw Maximum $ 0.6139 per kw $ 0.6139 per kw Schedule GT 3A $ 0.00321 per kwhr $ 0.00321 per kwhr On Peak $ 1.0098 per kw Maximum $ 0.5885 per kw $ 0.5885 per kw Schedule GT 38 $ 0.00291 per kwhr $ 0.00291 per kwhr On Peak $ 0.9114 per kw Maximum $ 0.4998 per kw $ 0.4998 per kw Schedule TM-RT $ 0.00304 per kwhr $ 0.00304 per kwhr On Peak $ 0.6540 per kw Maximum $ 0.3306 per kw $ 0.3306 per kw The monthly HPS charges shall equal the actual cost of providing energy and capacity supply transmission service, ancillary service, and any other cost element directly related to the Company's HPS load obligation, including an Administrative Charge and applicable taxes. The Company will determine an Hourly Price Service (HPS - PCA) which will reflect the difference between the actual cost of serving Customers under HPS (including any cost adjustments from the PJM Settlement system) and the amount billed to HPS Customers for the same time period. The Company will determine the HPS-PCA rate by dividing the HPS-PCA amount by the total kilowatt-hour sales of the then current HPS customers. The HPS-PCA rate will be applied to each of the then current HPS customers' sales to determine the credit/charge for the billing month. At the conclusion of Hourly Price Service on June 1, 2006, any HPS PCA will be returned to, or collected from all Type II Customers regardless of their supplier. Date of Issue: November 30, 2017January 29 2018 December 1, 2017 March 1, 2018

Fifty-Rftfi-Sixth Revised Page No. 43.6 BILLING MONTHS - Billing months of June through October - Billing months of November through May. RATING PERIODS Weekdays - (Excluding Holidays) On-Peak Period 12:00 noon Intermediate Period 8:00 a.m. Off-Peak Period 8:00 p.m. 12:00 midnight Saturdays, Sundays and Holidays Off-Peak Period All Hours to to and to to 8:00 p.m. 12:00 noon 12:00 midnight 8:00 a.m. Holidays For the purpose of this tariff, holidays will be New Year's Day, Rev. Martin Luther King's Birthday, Presidents' Day, Memorial Day, Independence Day, Labor Day, Columbus Day, Veterans' Day, Thanksgiving Day and Christmas Day, as designated by the Federal Government. BILLING DEMANDS On-Peak ( Billing Months Only) - The billing demand shall be the maximum thirty (30) minute demand recorded during the on-peak period of the billing month. Maximum (All Months) - The billing demand shall be the maximum thirty (30) minute demand recorded during the billing month. PROCUREMENT COST ADJUSTMENT In addition to the Standard Offer Service rates shown above, for Residential, Type I, and Type II customers (excludes HPS customers) there will be a monthly (PCA) shown as a separate line item on the Customer's bill. Refer to HPS for the Hourly Priced Service Procurement Cost Adjustment (HPS-PCA). The PCA is a$ per kilowatt-hour rate applied to the Customer's billed kilowatt-hours. The PCA is an adjustment made in order to true-up the rates customers are billed to reflect the Company's actual costs of providing Standard Offer Service. A true-up adjustment will be made to the PCA at least three (3) times per year- effective with the June, November and February billing months. 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 Company's website at www.pepco.com. PUBLICATION OF PRICES The Standard Offer Service Rates shown in this Rider are posted on the Company's website at www.pepco.com. The market hourly Locational Marginal Prices used for HPS are available on the PJM website at www.pjm.com. Date of Issue: November 30, 2017Januarv 29, 2018 GeeemSer 1, 2017 March 1, 2018