Douglas E. Micheel Assistant General Counsel

Office 202.872.2318 Fax 202.331.6767 pepco.com demicheel@pepcoholdings.com EP9628

701 Ninth Street NW Washington, DC 20068-0001

January 27, 2021

Andrew S. Johnston Executive Secretary Public Service Commission of Maryland William Donald Schaefer Tower 6 St. Paul Street, 16th Floor Baltimore, MD 21202-6808

Re: Case No. 9494

Dear Mr. Johnston:

Enclosed please find Potomac Electric Power Company’s (Pepco) proposed update to Rider “E-MD” – EmPOWER MD Charge. Pepco requests that Rider “E-MD” become effective with the billing month of March 2021. The update reflects the revisions directed by the Commission in Order No. 89679 dated December 18, 2020. Specifically, the approved program costs for the Utilities’ Behavior Programs and Administrative Costs should be expensed and not amortized over five years beginning in 2021.

Due to current coronavirus restrictions, this communication will be e-filed and hard copies will not be provided, per the Commission’s Operational notice provided on March 16, 2020.

Accompanying this filing are four attachments:

• Attachment 1 is the proposed Rider EmPOWER MD Charge Pepco requests theCommission approve (clean and red-lined versions).

• Attachment 2 contains a summary of the proposed EmPOWER MD Charge for bothresidential and non-residential customers.

• Attachment 4 is the detailed rate design calculations and work papers for thedevelopment of the residential EE&C component of the EmPOWER MD Charge.

• Attachment 5 is the detailed rate design calculations and work papers for thedevelopment of the non-residential EE&C component of the EmPOWER MDCharge.

Mail Log No. 233508

Andrew S. Johnston Page 2 January 27, 2021

• Attachments 3, 6, 7 and 8 that were included in the original November 24, 2020

filing are not included herein as they remain unchanged.

Pepco respectfully requests consideration of the revised EmPOWER Maryland Charge at the February 24, 2021 Administrative Meeting. Please feel free to contact me if you have any questions regarding this matter. Sincerely, s/Douglas E. Micheel Douglas E. Micheel

Enclosure cc: Leslie M. Romine, Staff Counsel David S. Lapp, Public Counsel

Attachment 1

Electric--P.S.C. Md. No. 1 MD One Hundred and Sixty-Fifth Revised Page No. 1

Date of Issue: January 27, 2021 Date Effective: Billing Month of March 2021

RATE SCHEDULES

FOR

ELECTRIC SERVICE

IN

MARYLAND

POTOMAC ELECTRIC POWER COMPANY

RATES AND REGULATORY PRACTICES GROUP

Electric--P.S.C. Md. No. 1 MD One Hundred and Sixty-Fifth Revised Page No. 2

Date of Issue: January 27, 2021 Date Effective: Billing Month of March 2021

TABLE OF CONTENTS RATE SCHEDULES

RESIDENTIAL SERVICE - SCHEDULE "R" ...................................................................... Page 3 - 3.1 TIME METERED RESIDENTIAL SERVICE - SCHEDULE "R-TM" ................................... Page 4 - 4.1 GENERAL SERVICE - SCHEDULE "GS" ......................................................................... Page 5 - 5.1 TEMPORARY SERVICE - SCHEDULE "T" ....................................................................... Page 6 - 6.1 TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE II

SCHEDULE "MGT LV II" ............................................................................................. Page 7 - 7.2

TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE II A SCHEDULE "MGT LV II A" (THIS SCHEDULE HAS BEEN DELETED) .......................... Page 7.3 – 7.5 TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE III

SCHEDULE "MGT LV III" ............................................................................................ Page 7.6 – 7.8

TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE II SCHEDULE "MGT 3A II" ............................................................................................. Page 8 - 8.2

TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE II A SCHEDULE "MGT 3A II A" (THIS SCHEDULE HAS BEEN DELETED) ................... Page 8.2 – 8.5

TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE III SCHEDULE "MGT 3A III" ............................................................................................ Page 8.6 – 8.8

TIME METERED GENERAL SERVICE - LOW VOLTAGE - SCHEDULE "GT LV" ................................................................................................... Page 9 - 9.2

TIME METERED GENERAL SERVICE - PRIMARY SERVICE - SCHEDULE "GT 3A" ................................................................................................... Page 10 - 10.2

TIME METERED GENERAL SERVICE - HIGH VOLTAGE - SCHEDULE "GT 3B" ................................................................................................... Page 11 - 11.2

TIME METERED RAPID TRANSIT SERVICE - SCHEDULE "TM-RT" ............................. Page 12 - 12.1 ELECTRIC VEHICLE SERVICE - SCHEDULE "EV" ......................................................... Page 13 – 13.1 (THIS SCHEDULE IS CLOSED TO NEW CUSTOMERS) OUTDOOR LIGHTING SERVICE - SCHEDULE "OL"....................................................... Page 14 - 14.1 STREET LIGHTING SERVICE - SCHEDULE "SL" ........................................................... Page 15 - 15.1 SERVICING STREET LIGHTS SERVED FROM OVERHEAD LINES -

SCHEDULE "SSL-OH" ................................................................................................ Page 16 - 16.2 SERVICING STREET LIGHTS SERVED FROM UNDERGROUND

LINES - SCHEDULE "SSL-UG" .................................................................................. Page 17 - 17.2SERVICING STREET LIGHTS SERVED FROM OVERHEAD LINES – SCHEDULE “SSL-OH-LED” ……………………………………………………………….. Page 17.3 – 17.5 SERVICING STREET LIGHTS SERVED FROM UNDERGROUND LINES –

Electric--P.S.C. Md. No. 1 MD One Hundred and Sixty-Fifth Revised Page No. 2.1

Date of Issue: January 27, 2021 Date Effective: Billing Month of March 2021

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

RESIDENTIAL TIME-OF-USE PILOT PROGRAM – SCHEDULE “R-TOU-P” …………… Page 24 – 24.1

PUBLIC ELECTRIC VEHICLE CHARGING SERVICE – SCHEDULE “PC-PIV” ………… Page 25 – 25.1

RESERVED FOR FUTURE USE ....................................................................................... Page 25 – 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 "DT" .................................................................. Page 36

MONTGOMERY COUNTY SURCHARGE - RIDER "MCS" .............................................. Page 37

MARYLAND ENVIRONMENTAL SURCHARGE - RIDER "MES" ..................................... Page 38

Electric--P.S.C. Md. No. 1 MD One Hundred and Thirty-First Revised Page No. 2.2

Date of Issue: January 27, 2021 Date Effective: Billing Month of March 2021

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 "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

ELECTRIC VEHICLE CHARGING PROGRAM – RIDER “EVCP”.. ……………………… Page 58 – 58.2

GREEN RIDER – RIDER “GREEN” ………………………………………………………….. Page 59

ELECTRIC VEHICLE CHARGING DISTRIBUTION DEMAND CHARGE

CREDIT – RIDER “EVCDDCC” ……………………………………………………….. Page 60 - 60.1

Electric--P.S.C. Md. No. 1 MD Thirteenth Revised Page No. 48

Date of Issue: January 27, 2021 Date Effective: Billing Month of March 2021

EMPOWER MD CHARGE RIDER "E-MD"

RIDER “E-MD” – EMPOWER MD CHARGE This rider is applicable to Schedules "R", "R-TM", “PIV”, “R-PIV”, “R-TOU-P”, GS", "T", “MGT LV II”, “MGT 3A II”, “MGT LV III”, “MGT 3A III”, “GT LV”, “GT 3A”, “GT 3B”, “TM-RT”, “EV”, “SL”, “OL”, and “TN”. Amounts billed to customers shall include a surcharge to reflect demand-side management program costs. Rider “E-MD” will be determined annually by class based on projections of demand-side management program costs and PJM market earnings (including an adjustment for variances between budgeted and actual prior year expenditures) and forecasts of kilowatt hour sales. Rate Schedule Rate ($ per kilowatt-hour) “R "R-TM" $ 0.006318 “PIV”, “R-PIV” and R-TOU-P” "GS", "T”, "SL, "OL", "EV" and "TN" $ 0.006384 "MGT LV II”, “MGT 3A II", “MGT LV III”, and “MGT 3A III” $ 0.006384 "GT LV", GT 3A”, “GT 3B”, and "TM-RT" $ 0.006384 This surcharge will be effective Billing Month of March 2021 and will be revised on or before January of each subsequent year to reflect each year’s costs. The rider will be applied each year thereafter, and will include cost and revenue effects, effective with the billing month of January. The surcharge (in dollars per kilowatt hour) will be computed by dividing the total annual amount to be recovered for each class by forecasted Maryland retail sales (in kilowatt hours) for that class. The total amount to be recovered (R) is computed in accordance with the following formula:

R=A+B+C Where A is amortization (paragraph (c) below, B is the capital cost recovery factor (CCRF) (paragraph (d) below), and C is the current year expense (paragraph (e) below). The surcharge will be computed for billing purposes in accordance with the procedure described below: (a) Current year program costs will be determined by reference to budgeted and projected utility

costs minus projected PJM market earnings. Program costs include program design costs, implementation contractor expenses, education costs, marketing costs, rebate and buy-down costs, utility incentives, capital costs, measurement and verification (M&V) and evaluation costs applicable to the conservation and demand side management programs.

(b) The unamortized balance of program costs for each prior year will be determined as of the

beginning of the year by subtracting accumulated amortization from cumulative program costs at that date. Such costs and amortization are recorded in a Demand-Side Recovery Account.

(c) For the conservation programs, amortization for the year will be based on a five year amortization

period and will be the sum of (i) 20% of estimated current year program costs, and (ii) unamortized balance of program cost for each prior year (as of the beginning of the period) divided by the remaining years in the amortization period (including the current period).

Electric--P.S.C. Md. No. 1 MD Thirteenth Revised Page No. 48.1

Date of Issue: January 27, 2021 Date Effective: Billing Month of March 2021

NOTE: Through this mechanism, the second through fifth years of amortization related to a given year's program costs will reflect a true-up for any variance between actual and originally projected costs or sales in that year. The demand response program component of the EmPower Md. Charge will be calculated in a similar method as noted above in (i) and (ii), with the costs recovered through two different amortization schedules, which are based on the classification of expenses. Costs associated with equipment installation are amortized over a 15 year period. Program marketing and evaluation costs are amortized over a 5 year period.

(d) The Capital Cost Recovery Factor (CCRF) will be computed for billing purposes by monthly

application of the last Commission-authorized rate of return on rate base in a base rate proceeding to the unamortized balance of program costs as of the beginning of the month, plus one-half of current month program costs. The CCRF will be recalculated with each annual update of the tariff with no compounding.

(e) For demand response programs, operations and maintenance expenses will be expensed

annually.

REDLINE

Electric--P.S.C. Md. No. 1 MD One Hundred and Sixty-Fourth Fifth Revised Page No. 1

Date of Issue: December 30, 2020January 27, 2021 Date Effective: Usage on and after January 1, 2021Billing Month of March, 2021

RATE SCHEDULES

FOR

ELECTRIC SERVICE

IN

MARYLAND

POTOMAC ELECTRIC POWER COMPANY

RATES AND REGULATORY PRACTICES GROUP

Electric--P.S.C. Md. No. 1 MD One Hundred and Sixty-Fourth Fifth Revised Page No. 2

Date of Issue: December 30, 2020January 27, 2021 Date Effective: Usage on and after January 1, 2021Billing Month of March, 2021

TABLE OF CONTENTS RATE SCHEDULES

RESIDENTIAL SERVICE - SCHEDULE "R" ...................................................................... Page 3 - 3.1 TIME METERED RESIDENTIAL SERVICE - SCHEDULE "R-TM" ................................... Page 4 - 4.1 GENERAL SERVICE - SCHEDULE "GS" ......................................................................... Page 5 - 5.1 TEMPORARY SERVICE - SCHEDULE "T" ....................................................................... Page 6 - 6.1 TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE II

SCHEDULE "MGT LV II" ............................................................................................. Page 7 - 7.2

TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE II A SCHEDULE "MGT LV II A" (THIS SCHEDULE HAS BEEN DELETED) .......................... Page 7.3 – 7.5 TIME METERED MEDIUM GENERAL SERVICE - LOW VOLTAGE - TYPE III

SCHEDULE "MGT LV III" ............................................................................................ Page 7.6 – 7.8

TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE II SCHEDULE "MGT 3A II" ............................................................................................. Page 8 - 8.2

TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE II A SCHEDULE "MGT 3A II A" (THIS SCHEDULE HAS BEEN DELETED) ................... Page 8.2 – 8.5

TIME METERED MEDIUM GENERAL SERVICE - PRIMARY SERVICE - TYPE III SCHEDULE "MGT 3A III" ............................................................................................ Page 8.6 – 8.8

TIME METERED GENERAL SERVICE - LOW VOLTAGE - SCHEDULE "GT LV" ................................................................................................... Page 9 - 9.2

TIME METERED GENERAL SERVICE - PRIMARY SERVICE - SCHEDULE "GT 3A" ................................................................................................... Page 10 - 10.2

TIME METERED GENERAL SERVICE - HIGH VOLTAGE - SCHEDULE "GT 3B" ................................................................................................... Page 11 - 11.2

TIME METERED RAPID TRANSIT SERVICE - SCHEDULE "TM-RT" ............................. Page 12 - 12.1 ELECTRIC VEHICLE SERVICE - SCHEDULE "EV" ......................................................... Page 13 – 13.1 (THIS SCHEDULE IS CLOSED TO NEW CUSTOMERS) OUTDOOR LIGHTING SERVICE - SCHEDULE "OL"....................................................... Page 14 - 14.1 STREET LIGHTING SERVICE - SCHEDULE "SL" ........................................................... Page 15 - 15.1 SERVICING STREET LIGHTS SERVED FROM OVERHEAD LINES -

SCHEDULE "SSL-OH" ................................................................................................ Page 16 - 16.2 SERVICING STREET LIGHTS SERVED FROM UNDERGROUND

LINES - SCHEDULE "SSL-UG" .................................................................................. Page 17 - 17.2SERVICING STREET LIGHTS SERVED FROM OVERHEAD LINES – SCHEDULE “SSL-OH-LED” ……………………………………………………………….. Page 17.3 – 17.5

Electric--P.S.C. Md. No. 1 MD One Hundred and Sixty-Fourth Fifth Revised Page No. 2.1

Date of Issue: December 30, 2020January 27, 2021 Date Effective: Usage on and after January 1, 2021Billing Month of March, 2021

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

RESIDENTIAL TIME-OF-USE PILOT PROGRAM – SCHEDULE “R-TOU-P” …………… Page 24 – 24.1

PUBLIC ELECTRIC VEHICLE CHARGING SERVICE – SCHEDULE “PC-PIV” ………… Page 25 – 25.1

RESERVED FOR FUTURE USE ....................................................................................... Page 25 – 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 "DT" .................................................................. Page 36

MONTGOMERY COUNTY SURCHARGE - RIDER "MCS" .............................................. Page 37

MARYLAND ENVIRONMENTAL SURCHARGE - RIDER "MES" ..................................... Page 38

Electric--P.S.C. Md. No. 1 MD One Hundred and Thirtieth Thirty-First Revised Page No. 2.2

Date of Issue: December 30, 2020January 27, 2021 Date Effective: Usage on and after January 1, 2021Billing Month of March, 2021

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 "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

ELECTRIC VEHICLE CHARGING PROGRAM – RIDER “EVCP”.. ……………………… Page 58 – 58.2

GREEN RIDER – RIDER “GREEN” ………………………………………………………….. Page 59

ELECTRIC VEHICLE CHARGING DISTRIBUTION DEMAND CHARGE

CREDIT – RIDER “EVCDDCC” ……………………………………………………….. Page 60 - 60.1

Electric--P.S.C. Md. No. 1 MD Twelfth Thirteenth Revised Page No. 48

Date of Issue: December 30, 2020January 27, 2021 Date Effective: Billing Month of January March 2021

EMPOWER MD CHARGE RIDER "E-MD"

RIDER “E-MD” – EMPOWER MD CHARGE This rider is applicable to Schedules "R", "R-TM", “PIV”, “R-PIV”, “R-TOU-P”, GS", "T", “MGT LV II”, “MGT 3A II”, “MGT LV III”, “MGT 3A III”, “GT LV”, “GT 3A”, “GT 3B”, “TM-RT”, “EV”, “SL”, “OL”, and “TN”. Amounts billed to customers shall include a surcharge to reflect demand-side management program costs. Rider “E-MD” will be determined annually by class based on projections of demand-side management program costs and PJM market earnings (including an adjustment for variances between budgeted and actual prior year expenditures) and forecasts of kilowatt hour sales. Rate Schedule Rate ($ per kilowatt-hour) “R "R-TM" $ 0.006015 0.006318 “PIV”, “R-PIV” and R-TOU-P” "GS", "T”, "SL, "OL", "EV" and "TN" $ 0.006273 0.006384 "MGT LV II”, “MGT 3A II", “MGT LV III”, and “MGT 3A III” $ 0.006273 0.006384 "GT LV", GT 3A”, “GT 3B”, and "TM-RT" $ 0.006273 0.006384 This surcharge will be effective Billing Month of January March 2021 and will be revised on or before January of each subsequent year to reflect each year’s costs. The rider will be applied each year thereafter, and will include cost and revenue effects, effective with the billing month of January. The surcharge (in dollars per kilowatt hour) will be computed by dividing the total annual amount to be recovered for each class by forecasted Maryland retail sales (in kilowatt hours) for that class. The total amount to be recovered (R) is computed in accordance with the following formula:

R=A+B+C Where A is amortization (paragraph (c) below, B is the capital cost recovery factor (CCRF) (paragraph (d) below), and C is the current year expense (paragraph (e) below). The surcharge will be computed for billing purposes in accordance with the procedure described below: (a) Current year program costs will be determined by reference to budgeted and projected utility

costs minus projected PJM market earnings. Program costs include program design costs, implementation contractor expenses, education costs, marketing costs, rebate and buy-down costs, utility incentives, capital costs, measurement and verification (M&V) and evaluation costs applicable to the conservation and demand side management programs.

(b) The unamortized balance of program costs for each prior year will be determined as of the

beginning of the year by subtracting accumulated amortization from cumulative program costs at that date. Such costs and amortization are recorded in a Demand-Side Recovery Account.

(c) For the conservation programs, amortization for the year will be based on a five year amortization

period and will be the sum of (i) 20% of estimated current year program costs, and (ii) unamortized balance of program cost for each prior year (as of the beginning of the period) divided by the remaining years in the amortization period (including the current period).

Electric--P.S.C. Md. No. 1 MD Twelfth Thirteenth Revised Page No. 48.1

Date of Issue: December 30, 2020January 27, 2021 Date Effective: Billing Month of January March 2021

NOTE: Through this mechanism, the second through fifth years of amortization related to a given year's program costs will reflect a true-up for any variance between actual and originally projected costs or sales in that year. The demand response program component of the EmPower Md. Charge will be calculated in a similar method as noted above in (i) and (ii), with the costs recovered through two different amortization schedules, which are based on the classification of expenses. Costs associated with equipment installation are amortized over a 15 year period. Program marketing and evaluation costs are amortized over a 5 year period.

(d) The Capital Cost Recovery Factor (CCRF) will be computed for billing purposes by monthly

application of the last Commission-authorized rate of return on rate base in a base rate proceeding to the unamortized balance of program costs as of the beginning of the month, plus one-half of current month program costs. The CCRF will be recalculated with each annual update of the tariff with no compounding.

(e) For demand response programs, operations and maintenance expenses will be expensed

annually.

Attachment 2

Pepco - Maryland ATTACHMENT 2EmPOWER MD Surcharge Update Page 1 of 1March 2021 Billing Cycle

Service Classification Energy Efficiency Direct Load Control Dynamic Pricing Total

Residential 0.004731$ 0.001839$ (0.000252)$ 0.006318$ GS 0.006248$ 0.000136$ -$ 0.006384$ MGT-LV 0.006248$ 0.000136$ -$ 0.006384$ MGT 3A 0.006248$ 0.000136$ -$ 0.006384$ GT-LV 0.006248$ 0.000136$ -$ 0.006384$ GT 3A 0.006248$ 0.000136$ -$ 0.006384$ GT 3B 0.006248$ 0.000136$ -$ 0.006384$ TM-RT 0.006248$ 0.000136$ -$ 0.006384$ EV 0.006248$ 0.000136$ -$ 0.006384$ OL 0.006248$ 0.000136$ -$ 0.006384$ SL 0.006248$ 0.000136$ -$ 0.006384$ TN 0.006248$ 0.000136$ -$ 0.006384$ T 0.006248$ 0.000136$ -$ 0.006384$

Attachment 4

Attachment 4 Page 1 of 3PEPCO - MarylandEmPower Maryland Surcharge WorkpaperResidential Energy Efficiency Programs

SECTION I FORECASTED YEAR AMORTIZATION SCHEDULE

Table 1 - Forecasted Program Year Monthly Delivered Sales (MWH)

Jan-21 609,576Feb-21 533,053Mar-21 506,287Apr-21 396,398May-21 281,121Jun-21 398,765Jul-21 548,301

Aug-21 566,858Sep-21 522,322Oct-21 320,280Nov-21 341,032Dec-21 469,835

5,493,828

Table 2 - Forecasted Program Year Monthly Amortization and CCRF

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17)= Sum of Vintage

Year Amort Tables Col 2

= Sum of Vintage Year Amort Tables Col 3

= Sum of Vintage Year Amort Tables Col 5

= Col 2 + Col 3 - Col 4 - Col 5

= (Col 3 - Col 4 - Col 5) x Composite Tax Factor = Col 9 + Col 8 = Col 6 - Col 10

= Col 11 x (Col 13)/12

= Col 14 x 1/(1- Composite Tax Factor)

Unamortized EstimatedUnamortized Additional Unamortized Ending Balance Excess ADIT Estimated CCRF

Beginning Program WGL Billing, Ending Deferred Normal Accum Excess ADIT Unamortized Total Accum Net of Accum Excess ADIT Monthly Amortization CCRF Rate CCRF Adjusted for O&M PJM MarketMonth Balance Costs Coordinated Program (CP) Amortization Balance Tax Activity Deferred Tax Ending Balance Deferred Tax and Deferred Tax Adjusted for Income Tax Net-of-Tax Net-of-Tax Income Tax Expense Revenues

Dec-20 58,481,209 (16,128,713) (19,758,222) 38,722,986$

Jan-21 58,481,209$ 2,372,548$ -$ (2,641,207)$ 58,212,549$ 73,928$ (16,054,785)$ (3,478,280)$ (19,533,065) 38,679,485$ 208,643$ 6.73% 217,107$ 299,531$ 158,181$ 77,961$ Feb-21 58,212,549$ 2,372,548$ -$ (2,309,643)$ 58,275,454$ (17,310)$ (16,072,095)$ (3,327,050)$ (19,399,145) 38,876,309$ 208,643$ 6.73% 217,537$ 300,124$ 158,181$ 77,961$ Mar-21 58,275,454$ 2,372,548$ -$ (2,193,672)$ 58,454,330$ (49,222)$ (16,121,317)$ (3,175,821)$ (19,297,138) 39,157,192$ 208,643$ 6.73% 218,877$ 301,973$ 158,181$ 77,961$ Apr-21 58,454,330$ 2,372,548$ -$ (1,717,535)$ 59,109,343$ (180,243)$ (16,301,560)$ (3,024,591)$ (19,326,151) 39,783,192$ 208,643$ 6.73% 221,421$ 305,482$ 158,181$ 77,961$ May-21 59,109,343$ 2,372,548$ -$ (1,218,055)$ 60,263,835$ (317,687)$ (16,619,247)$ (2,873,362)$ (19,492,609) 40,771,227$ 208,643$ 6.73% 225,948$ 311,728$ 158,181$ 77,961$ Jun-21 60,263,835$ 2,372,548$ -$ (1,727,790)$ 60,908,593$ (177,421)$ (16,796,668)$ (2,722,132)$ (19,518,800) 41,389,793$ 208,643$ 6.73% 230,455$ 317,945$ 158,181$ 99,240$ Jul-21 60,908,593$ 2,372,548$ -$ (2,375,712)$ 60,905,429$ 871$ (16,795,797)$ (2,570,903)$ (19,366,700) 41,538,729$ 208,643$ 6.73% 232,607$ 320,915$ 158,181$ 99,240$

Aug-21 60,905,429$ 2,372,548$ -$ (2,456,117)$ 60,821,859$ 22,996$ (16,772,801)$ (2,419,673)$ (19,192,474) 41,629,385$ 208,643$ 6.73% 233,279$ 321,842$ 158,181$ 99,240$ Sep-21 60,821,859$ 2,372,548$ -$ (2,263,148)$ 60,931,258$ (30,104)$ (16,802,905)$ (2,268,443)$ (19,071,348) 41,859,910$ 208,643$ 6.73% 234,180$ 323,085$ 158,181$ 99,240$ Oct-21 60,931,258$ 2,372,548$ -$ (1,387,726)$ 61,916,080$ (270,998)$ (17,073,903)$ (2,117,214)$ (19,191,117) 42,724,963$ 208,643$ 6.73% 237,253$ 327,325$ 158,181$ 99,240$ Nov-21 61,916,080$ 2,372,548$ -$ (1,477,644)$ 62,810,984$ (246,255)$ (17,320,158)$ (1,965,984)$ (19,286,142) 43,524,842$ 208,643$ 6.73% 241,923$ 333,768$ 158,181$ 99,240$ Dec-21 62,810,984$ 2,372,548$ -$ (2,035,728)$ 63,147,804$ (92,684)$ (17,412,842)$ (1,814,755)$ (19,227,597) 43,920,207$ 208,643$ 6.73% 245,276$ 338,393$ 158,181$ 99,240$

Total 28,470,574 - (23,803,979) 2,503,714 3,802,111 1,898,171 1,084,487

Attachment 4 Page 2 of 3

PEPCO - MarylandEmPower Maryland Surcharge WorkpaperResidential Energy Efficiency Programs

SECTION II - PRIOR YEAR TRUE UP

Table 3 - Actual Prior Year Monthly Revenue Requirement

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)= Sum of

Vintage Year Amort Tables

Col 2= Sum of Vintage Year

Amort Tables Col 3= Sum of Vintage Year

Amort Tables Col 5= Col 2 + Col 3 - Col 4 -

Col 5= (Col 3 - Col 4 - Col 5) x

Composite Tax Factor = Col 6 - Col 10= Col 11 x (Col

13)/12= Col 14 x 1/(1-

Composite Tax Factor)=Col 5 - Col 12 + Col 15

+ Col 16 - Col 17 =Col 19 - Col 18

Actual Unamortized EstimatedUnamortized Additional Unamortized Ending Balance Excess ADIT Estimated CCRF Actual Monthly Over/(Under)

Beginning Program WGL Billing, Actual Ending Deferred Normal Accum Excess ADIT Unamortized Total Accum Net of Accum Monthly Amortization CCRF Rate CCRF Adjusted for O&M PJM Market Revenue DSM Surcharge Over/(Under) RecoveryMonth Balance Costs Coordinated Program (CP) Amortization Balance Tax Activity Deferred Tax Ending Balance Deferred Tax Deferred Tax Adjusted for Income Tax Net-of-Tax Net-of-Tax Income Tax Expense Revenues Requirement Revenue Recovery Cumulative Balance

Jan-19 66,118,071$ 2,758,217$ 2,838,472$ 66,037,816$ (22,084)$ 18,208,105$ 7,107,789$ 25,315,895$ 40,721,921$ 208,643$ 6.71% 227,470$ 313,827$ 107,025$ 2,836,632$ 2,483,384$ (353,248) 3,618,268$ Feb-19 66,037,816$ 1,950,813$ 2,837,826$ 65,150,802$ (244,084)$ 17,964,021$ 6,956,560$ 24,920,581$ 40,230,221$ 208,643$ 6.71% 226,355$ 312,289$ 96,704$ 2,844,768$ 2,445,975$ (398,793) 3,219,475$ Mar-19 65,150,802$ 1,754,047$ 2,367,364$ 64,537,486$ (168,769)$ 17,795,252$ 6,805,330$ 24,600,583$ 39,936,903$ 208,643$ 6.71% 224,160$ 309,261$ 107,044$ 2,360,938$ 2,040,826$ (320,112) 2,899,363$ Apr-19 64,537,486$ 2,121,958$ 1,872,979$ 64,786,465$ 68,513$ 17,863,765$ 6,654,101$ 24,517,866$ 40,268,599$ 208,643$ 6.71% 224,267$ 309,409$ 103,597$ 1,870,148$ 1,614,025$ (256,123) 2,643,240$ May-19 64,786,465$ 2,090,923$ 1,642,081$ 65,235,307$ 123,510$ 17,987,275$ 6,502,871$ 24,490,146$ 40,745,160$ 208,643$ 6.71% 226,528$ 312,527$ 107,050$ 1,638,916$ 1,415,145$ (223,771) 2,419,469$ Jun-19 65,235,307$ 2,258,091$ 2,185,376$ 65,308,022$ 20,009$ 18,007,284$ 6,351,642$ 24,358,926$ 40,949,096$ 208,643$ 6.71% 228,430$ 315,152$ 67,241$ 2,224,644$ 1,883,429$ (341,216) 2,078,254$ Jul-19 65,308,022$ 2,082,912$ 2,917,798$ 64,473,136$ (229,740)$ 17,777,544$ 6,200,412$ 23,977,956$ 40,495,180$ 208,643$ 6.71% 227,731$ 314,188$ 69,406$ 2,953,937$ 2,514,450$ (439,487) 1,638,767$

Aug-19 64,473,136$ 1,915,431$ 784,384$ 3,126,467$ 62,477,715$ (549,090)$ 17,228,454$ 6,049,182$ 23,277,637$ 39,200,078$ 208,643$ 6.73% 223,538$ 308,403$ 69,406$ 3,156,821$ 2,694,478$ (462,343) 1,176,424$ Sep-19 62,477,715$ 2,648,363$ -$ 2,465,809$ 62,660,269$ 50,234$ 17,278,688$ 5,897,953$ 23,176,641$ 39,483,628$ 208,643$ 6.73% 220,701$ 304,489$ 67,167$ 2,494,488$ 2,124,751$ (369,737) 806,687$ Oct-19 62,660,269$ 2,638,533$ -$ 1,947,862$ 63,350,939$ 190,055$ 17,468,743$ 5,746,723$ 23,215,467$ 40,135,473$ 208,643$ 6.73% 223,325$ 308,108$ 69,559$ 1,977,768$ 1,678,887$ (298,881) 507,807$ Nov-19 63,350,939$ 2,043,621$ 254,078$ 1,686,180$ 63,454,303$ 28,443$ 17,497,186$ 5,595,494$ 23,092,680$ 40,361,623$ 208,643$ 6.73% 225,787$ 311,506$ 67,315$ 1,721,728$ 1,453,640$ (268,087) 239,719$ Dec-19 63,454,303$ 2,209,705$ -$ 2,398,287$ 63,265,721$ (51,893)$ 17,445,293$ 5,444,264$ 22,889,558$ 40,376,163$ 208,643$ 6.73% 226,463$ 312,438$ 65,071$ 2,437,012$ 2,066,834$ (370,177) (130,458)$ Jan-20 63,265,721$ 1,922,836$ 423,241$ 2,374,367$ 62,390,948$ (240,716)$ 17,204,577$ 5,293,035$ 22,497,612$ 39,893,336$ 208,643$ 6.73% 225,149$ 310,625$ 73,993$ 2,402,357$ 2,403,339$ 982 (129,476)$ Feb-20 62,390,948$ 1,681,463$ 12,833$ 2,016,569$ 62,043,008$ (95,744)$ 17,108,833$ 5,141,805$ 22,250,638$ 39,792,370$ 208,643$ 6.73% 223,512$ 308,366$ 65,021$ 2,051,271$ 2,042,973$ (8,299) (137,775)$ Mar-20 62,043,008$ 2,098,878$ 85,524$ 1,850,745$ 62,205,618$ 44,746$ 17,153,579$ 4,990,575$ 22,144,155$ 40,061,464$ 208,643$ 6.73% 223,983$ 309,017$ 69,505$ 1,881,614$ 1,875,008$ (6,606) (144,381)$ Apr-20 62,205,618$ 2,101,558$ 82,646$ 1,623,870$ 62,600,660$ 108,706$ 17,262,285$ 4,839,346$ 22,101,631$ 40,499,029$ 208,643$ 6.73% 225,965$ 311,751$ 67,148$ 1,659,830$ 1,645,393$ (14,437) (158,818)$ May-20 62,600,660$ 967,022$ 84,180$ 1,500,969$ 61,982,533$ (170,093)$ 17,092,192$ 4,688,116$ 21,780,309$ 40,202,225$ 208,643$ 6.73% 226,360$ 312,296$ 69,386$ 1,535,236$ 1,520,677$ (14,560) (173,378)$ Jun-20 61,982,533$ 1,372,433$ 66,425$ 1,946,430$ 61,342,111$ (176,228)$ 16,915,964$ 4,536,887$ 21,452,851$ 39,889,260$ 208,643$ 6.73% 224,650$ 309,936$ 77,941$ 1,969,782$ 1,971,959$ 2,178 (171,200)$ Jul-20 61,342,111$ 1,618,703$ (11,300)$ 2,804,574$ 60,167,540$ (323,213)$ 16,592,751$ 4,385,657$ 20,978,409$ 39,189,132$ 208,643$ 6.73% 221,808$ 306,016$ 80,560$ 2,821,388$ 2,841,373$ 19,986 (151,215)$

Aug-20 60,167,540$ 1,279,726$ 101,830$ 2,802,458$ 58,542,978$ (447,039)$ 16,145,712$ 4,234,428$ 20,380,140$ 38,162,838$ 208,643$ 6.73% 216,966$ 299,335$ 80,560$ 2,812,590$ 2,839,236$ 26,646 (124,569)$ Sep-20 58,542,978$ 2,262,290$ 185,800$ 2,235,179$ 58,384,288$ (43,667)$ 16,102,045$ 4,083,198$ 20,185,244$ 38,199,045$ 208,643$ 6.73% 214,189$ 295,504$ 77,961$ 2,244,079$ 2,264,472$ 20,393 (104,176)$ Oct-20 58,384,288$ 1,846,503$ 140,197$ 1,445,624$ 58,644,971$ 71,733$ 16,173,778$ 3,931,969$ 20,105,747$ 38,539,224$ 208,643$ 6.73% 215,244$ 296,960$ 77,961$ 1,455,980$ 1,464,338$ 8,357 (95,819)$ Nov-20 58,644,971$ 1,846,503$ 140,197$ 1,519,546$ 58,831,731$ 51,392$ 16,225,170$ 3,780,739$ 20,005,909$ 38,825,822$ 208,643$ 6.73% 217,002$ 299,386$ 77,961$ 1,532,328$ 1,539,216$ 6,888 (88,931)$ Dec-20 58,831,731$ 1,846,503$ 140,197$ 2,056,829$ 58,481,209$ (96,455)$ 16,128,715$ 3,629,509$ 19,758,225$ 38,722,984$ 208,643$ 6.73% 217,518$ 300,097$ 77,961$ 2,070,322$ 2,083,454$ 13,132 (75,798)$

4th Qtr Estimates 255,703,539$ 194,732,098$ 25,202,489$ 7,511,143$ 21,219,172$ 33,184,964$ 10,863,309$ 209,542,610$ 209,466,812$ (75,798)$

Attachment 4 Page 3 of 3

PEPCO - MarylandEmPower Maryland Surcharge WorkpaperResidential Energy Efficiency Programs

SECTION II - PRIOR YEAR TRUE UP

Table 4 - Prior Year Monthly Over/Under Recovered Balances

(1) (2) (3) (4) (5)= Table 3 Col 16 = Col 3 - Col 2

Actual Monthly Over/(Under)Revenue DSM Surcharge Over/(Under) Recovery

Month Requirement Revenue Recovery Cumulative Balance

Jan-19 2,836,632$ 2,483,384$ (353,248)$ 3,618,268$ Feb-19 2,844,768$ 2,445,975$ (398,793)$ 3,219,475$ Mar-19 2,360,938$ 2,040,826$ (320,112)$ 2,899,363$ Apr-19 1,870,148$ 1,614,025$ (256,123)$ 2,643,240$ May-19 1,638,916$ 1,415,145$ (223,771)$ 2,419,469$ Jun-19 2,224,644$ 1,883,429$ (341,216)$ 2,078,254$ Jul-19 2,953,937$ 2,514,450$ (439,487)$ 1,638,767$

Aug-19 3,156,821$ 2,694,478$ (462,343)$ 1,176,424$ Sep-19 2,494,488$ 2,124,751$ (369,737)$ 806,687$ Oct-19 1,977,768$ 1,678,887$ (298,881)$ 507,807$ Nov-19 1,721,728$ 1,453,640$ (268,087)$ 239,719$ Dec-19 2,437,012$ 2,066,834$ (370,177)$ (130,458)$ Jan-20 2,402,357$ 2,403,339$ 982$ (129,476)$ Feb-20 2,051,271$ 2,042,973$ (8,299)$ (137,775)$ Mar-20 1,881,614$ 1,875,008$ (6,606)$ (144,381)$ Apr-20 1,659,830$ 1,645,393$ (14,437)$ (158,818)$ May-20 1,535,236$ 1,520,677$ (14,560)$ (173,378)$ Jun-20 1,969,782$ 1,971,959$ 2,178$ (171,200)$ Jul-20 2,821,388$ 2,841,373$ 19,986$ (151,215)$

Aug-20 2,812,590$ 2,839,236$ 26,646$ (124,569)$ Sep-20 2,244,079$ 2,264,472$ 20,393$ (104,176)$ Oct-20 1,455,980$ 1,464,338$ 8,357$ (95,819)$ Nov-20 1,532,328$ 1,539,216$ 6,888$ (88,931)$ Dec-20 2,070,322$ 2,083,454$ 13,132$ (75,798)$

SECTION III TABLE 5 - EMPOWER MD SURCHARGE (RESIDENTIAL EE&C COMPONENT) CALCULATION

Forecasted Amortization (Straight Line) 23,803,979$ Table 2, Col 5Forecasted CCRF 3,802,111$ Table 2, Col 15Forecasted O&M Expense 1,898,171$ Table 2, Col 16Forecasted PJM Market Revenues (1,084,487)$ Table 2, Col 17Forecasted Fed Tax credit (2,503,714)$ Table 2, Col 12Prior Period True Up 75,798$ Table 4, Col 5Total Annual Amount to be Recovered 25,991,858$

Retail Sales - kwh 5,493,828,319$/KWH Surcharge 0.004731$ Gross Receipts Tax/PSC Assessment -$ $/KWH Surcharge 0.004731$

Note: (1) Approved DHCD program costs of $3,808,428 (1/2021-12/2021)

Attachment 5

Attachment 5 Page 1 of 3

Pepco - MarylandEmPower Maryland Surcharge WorkpaperC&I Energy Efficiency Programs

SECTION I FORECASTED YEAR AMORTIZATION SCHEDULE

Table 1 - Forecasted Program Year Monthly Delivered Sales (MWH)

Jan-21 707,988Feb-21 601,043Mar-21 674,255Apr-21 585,928May-21 614,586Jun-21 620,802Jul-21 746,383

Aug-21 803,608Sep-21 788,949Oct-21 638,575Nov-21 587,939Dec-21 609,489

7,979,545

Table 2 - Forecasted Program Year Monthly Amortization and CCRF

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16)

= Sum of Vintage Year Amort Tables Col 2

= Sum of Vintage Year Amort Tables Col 3

= Sum of Vintage Year Amort Tables Col 4 = Col 2 + Col 3 - Col 4

= (Col 3 - Col 4) x Composite Tax Factor = Col 8 + Col 7 = Col 5 - Col 9

= Col 10 x (Col 12)/12

= Col 13 x 1/(1- Composite Tax

Factor)

Unamortized EstimatedUnamortized Additional Unamortized Ending Balance Excess ADIT Estimated CCRF

Beginning Program Ending Deferred Normal Accum Excess ADIT Unamortized Total Accum Net of Accum Monthly Amortization CCRF Rate CCRF Adjusted for O&M PJM MarketMonth Balance Costs Amortization Balance Tax Activity Deferred Tax Ending Balance Deferred Tax Deferred TaxAdjusted for Income Tax Net-of-Tax Net-of-Tax Income Tax Expense Revenues

Dec-20 117,084,299 (32,269,130) (38,164,032) 78,920,267$

Jan-21 117,084,299$ 4,675,949$ (3,972,298)$ 117,787,950$ (193,627)$ (32,462,757)$ (5,649,282)$ (38,112,038) 79,675,912$ 338,869$ 6.73% 444,849$ 613,732$ 91,497$ 76,112$ Feb-21 117,787,950$ 4,675,949$ (3,372,261)$ 119,091,638$ (358,742)$ (32,821,499)$ (5,403,661)$ (38,225,159) 80,866,479$ 338,869$ 6.73% 450,308$ 621,264$ 91,497$ 76,112$ Mar-21 119,091,638$ 4,675,949$ (3,783,031)$ 119,984,556$ (245,709)$ (33,067,208)$ (5,158,040)$ (38,225,247) 81,759,309$ 338,869$ 6.73% 456,151$ 629,326$ 91,497$ 76,112$ Apr-21 119,984,556$ 4,675,949$ (3,287,461)$ 121,373,045$ (382,077)$ (33,449,285)$ (4,912,419)$ (38,361,703) 83,011,341$ 338,869$ 6.73% 462,167$ 637,626$ 91,497$ 76,112$ May-21 121,373,045$ 4,675,949$ (3,448,251)$ 122,600,743$ (337,832)$ (33,787,117)$ (4,666,798)$ (38,453,914) 84,146,828$ 338,869$ 6.73% 468,864$ 646,865$ 91,497$ 76,112$ Jun-21 122,600,743$ 4,675,949$ (3,483,127)$ 123,793,565$ (328,235)$ (34,115,352)$ (4,421,177)$ (38,536,528) 85,257,037$ 338,869$ 6.73% 475,163$ 655,556$ 91,497$ 122,456$ Jul-21 123,793,565$ 4,675,949$ (4,187,721)$ 124,281,794$ (134,348)$ (34,249,700)$ (4,175,556)$ (38,425,256) 85,856,538$ 338,869$ 6.73% 479,959$ 662,172$ 91,497$ 122,456$

Aug-21 124,281,794$ 4,675,949$ (4,508,793)$ 124,448,950$ (45,997)$ (34,295,697)$ (3,929,935)$ (38,225,632) 86,223,319$ 338,869$ 6.73% 482,669$ 665,911$ 91,497$ 122,456$ Sep-21 124,448,950$ 4,675,949$ (4,426,545)$ 124,698,354$ (68,630)$ (34,364,327)$ (3,684,314)$ (38,048,641) 86,649,714$ 338,869$ 6.73% 484,894$ 668,981$ 91,497$ 122,456$ Oct-21 124,698,354$ 4,675,949$ (3,582,845)$ 125,791,458$ (300,795)$ (34,665,122)$ (3,438,693)$ (38,103,815) 87,687,644$ 338,869$ 6.73% 489,001$ 674,647$ 91,497$ 122,456$ Nov-21 125,791,458$ 4,675,949$ (3,298,742)$ 127,168,665$ (378,973)$ (35,044,095)$ (3,193,072)$ (38,237,167) 88,931,499$ 338,869$ 6.73% 495,401$ 683,477$ 91,497$ 122,456$ Dec-21 127,168,665$ 4,675,949$ (3,419,649)$ 128,424,965$ (345,702)$ (35,389,797)$ (2,947,451)$ (38,337,248) 90,087,718$ 338,869$ 6.73% 502,133$ 692,765$ 91,497$ 122,456$

Total 56,111,389 (44,770,723) 4,066,432 7,852,322 1,097,959 1,237,755

Attachment 5 Page 2 of 3

Pepco - MarylandEmPower Maryland Surcharge WorkpaperC&I Energy Efficiency Programs

SECTION II - PRIOR YEAR TRUE UP

Table 3 - Actual Prior Year Monthly Revenue Requirement

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20)

= Sum of Vintage Year Amort Tables Col 2

= Sum of Vintage Year Amort Tables Col 3

= Sum of Vintage Year Amort Tables Col 4 = Col 2 + Col 3 - Col 4

= (Col 3 - Col 4) x Composite Tax Factor = Col 8 + Col 7 = Col 5 - Col 9

= Col 10 x (Col 12)/12

= Col 13 x 1/(1- Composite Tax

Factor)=Col 4 - Col 11 + Col

14 +Col 15 - Col 16 =Col 18 - Col 17

Actual Unamortized EstimatedUnamortized Additional Unamortized Ending Balance Excess ADIT Estimated CCRF Actual Monthly Over/(Under)

Beginning Program Actual Ending Deferred Normal Accum Excess ADIT Unamortized Total Accum Net of Accum Monthly Amortization CCRF Rate CCRF Adjusted for O&M PJM Market Revenue DSM Surcharge Over/(Under) RecoveryMonth Balance Costs Amortization Balance Tax Activity Deferred Tax Ending Balance Deferred Tax Deferred Tax Adjusted for Income Tax Net-of-Tax Net-of-Tax Income Tax Expense Revenues Requirement Revenue Recovery Cumulative Balance

Jan-19 99,101,494$ 2,893,201$ 3,900,648$ 98,094,047$ (277,224)$ 27,043,483$ 11,544,184$ 38,587,667$ 59,506,381$ 338,869$ 6.71% 334,134$ 460,986$ 134,566$ 3,888,199$ 3,652,787$ (235,411)$ $6,143,378Feb-19 98,094,047$ 3,104,942$ 3,759,637$ 97,439,352$ (180,156)$ 26,863,327$ 11,298,563$ 38,161,890$ 59,277,462$ 338,869$ 6.71% 332,139$ 458,233$ 121,590$ 3,757,411$ 3,339,272$ (418,139)$ $5,725,240Mar-19 97,439,352$ 2,972,500$ 3,458,844$ 96,953,008$ (133,830)$ 26,729,497$ 11,052,942$ 37,782,439$ 59,170,569$ 338,869$ 6.71% 331,200$ 456,938$ 134,590$ 3,442,322$ 3,063,620$ (378,703)$ $5,346,537Apr-19 96,953,008$ 3,092,353$ 3,280,117$ 96,765,245$ (51,668)$ 26,677,829$ 10,807,321$ 37,485,150$ 59,280,095$ 338,869$ 6.71% 331,207$ 456,948$ 130,256$ 3,267,940$ 2,912,087$ (355,853)$ $4,990,684May-19 96,765,245$ 3,804,587$ 3,945,923$ 96,623,909$ (38,892)$ 26,638,937$ 10,561,700$ 37,200,637$ 59,423,272$ 338,869$ 6.71% 331,914$ 457,923$ 134,598$ 3,930,379$ 2,999,560$ (930,819)$ $4,059,864Jun-19 96,623,909$ 4,481,063$ 3,640,552$ 97,464,419$ 231,288$ 26,870,225$ 10,316,080$ 37,186,304$ 60,278,115$ 338,869$ 6.71% 334,704$ 461,773$ 66,439$ 3,697,017$ 3,219,969$ (477,048)$ $3,582,816Jul-19 97,464,419$ 4,760,279$ 4,256,071$ 97,968,628$ 138,745$ 27,008,970$ 10,070,459$ 37,079,428$ 60,889,199$ 338,869$ 6.71% 338,803$ 467,428$ 68,578$ 4,316,051$ 3,595,447$ (720,604)$ $2,862,213

Aug-19 97,968,628$ 3,798,235$ 4,748,311$ 97,018,552$ (261,437)$ 26,747,533$ 9,824,838$ 36,572,370$ 60,446,182$ 338,869$ 6.73% 340,335$ 469,541$ 68,578$ 4,810,404$ 4,209,744$ (600,660)$ $2,261,553Sep-19 97,018,552$ 3,659,458$ 4,154,872$ 96,523,138$ (136,326)$ 26,611,207$ 9,579,217$ 36,190,423$ 60,332,715$ 338,869$ 6.73% 338,774$ 467,388$ 66,366$ 4,217,025$ 3,673,657$ (543,368)$ $1,718,185Oct-19 96,523,138$ 5,814,146$ 3,764,498$ 98,572,786$ 564,012$ 27,175,219$ 9,333,596$ 36,508,814$ 62,063,971$ 338,869$ 6.73% 343,312$ 473,648$ 68,729$ 3,830,547$ 3,337,467$ (493,080)$ $1,225,105Nov-19 98,572,786$ 6,008,653$ 3,099,525$ 101,481,914$ 800,519$ 27,975,738$ 9,087,975$ 37,063,712$ 64,418,202$ 338,869$ 6.73% 354,772$ 489,458$ 66,512$ 3,183,602$ 2,747,478$ (436,123)$ $788,982Dec-19 101,481,914$ 5,205,655$ 3,490,741$ 103,196,827$ 471,901$ 28,447,639$ 8,842,354$ 37,289,992$ 65,906,835$ 338,869$ 6.73% 365,550$ 504,329$ 64,295$ 3,591,906$ 3,080,689$ (511,217)$ $277,764Jan-20 103,196,827$ 3,584,045$ 3,238,052$ 103,542,820$ 95,209$ 28,542,848$ 8,596,733$ 37,139,580$ 66,403,240$ 338,869$ 6.73% 371,118$ 512,011$ 73,110$ 3,338,084$ 3,133,431$ (204,653)$ $73,111Feb-20 103,542,820$ 2,430,414$ 2,987,137$ 102,986,097$ (153,196)$ 28,389,652$ 8,351,112$ 36,740,764$ 66,245,334$ 338,869$ 6.73% 372,068$ 513,321$ 64,245$ 3,097,344$ 2,844,402$ (252,942)$ ($179,831)Mar-20 102,986,097$ 5,413,651$ 2,943,675$ 105,456,073$ 679,676$ 29,069,328$ 8,105,491$ 37,174,819$ 68,281,255$ 338,869$ 6.73% 377,335$ 520,588$ 68,676$ 3,056,718$ 2,807,198$ (249,520)$ ($429,351)Apr-20 105,456,073$ 3,294,560$ 2,600,666$ 106,149,968$ 190,942$ 29,260,270$ 7,859,870$ 37,120,140$ 69,029,828$ 338,869$ 6.73% 385,146$ 531,364$ 66,347$ 2,726,813$ 2,478,426$ (248,387)$ ($677,738)May-20 106,149,968$ 5,055,678$ 2,205,966$ 108,999,679$ 784,169$ 30,044,439$ 7,614,249$ 37,658,688$ 71,340,992$ 338,869$ 6.73% 393,728$ 543,204$ 68,558$ 2,341,742$ 2,100,247$ (241,495)$ ($919,234)Jun-20 108,999,679$ 5,591,327$ 2,797,633$ 111,793,373$ 768,755$ 30,813,194$ 7,368,628$ 38,181,822$ 73,611,551$ 338,869$ 6.73% 406,579$ 560,935$ 76,093$ 2,943,606$ 2,664,506$ (279,100)$ ($1,198,334)Jul-20 111,793,373$ 3,611,985$ 3,444,430$ 111,960,927$ 46,107$ 30,859,301$ 7,123,007$ 37,982,308$ 73,978,620$ 338,869$ 6.73% 413,978$ 571,142$ 78,649$ 3,598,054$ 3,278,503$ (319,550)$ ($1,517,885)

Aug-20 111,960,927$ 4,088,922$ 3,453,314$ 112,596,535$ 174,903$ 31,034,204$ 6,877,386$ 37,911,590$ 74,684,945$ 338,869$ 6.73% 416,988$ 575,295$ 78,649$ 3,611,091$ 3,289,452$ (321,639)$ ($1,839,524)Sep-20 112,596,535$ 4,064,251$ 3,161,789$ 113,498,997$ 248,335$ 31,282,539$ 6,631,765$ 37,914,304$ 75,584,693$ 338,869$ 6.73% 421,493$ 581,511$ 76,112$ 3,328,318$ 3,011,471$ (316,848)$ ($2,156,371)Oct-20 113,498,997$ 4,646,509$ 3,624,817$ 114,520,689$ 281,144$ 31,563,683$ 6,386,144$ 37,949,827$ 76,570,862$ 338,869$ 6.73% 426,783$ 588,809$ 76,112$ 3,798,644$ 4,068,430$ 269,786$ ($1,886,586)Nov-20 114,520,689$ 4,646,509$ 3,276,434$ 115,890,765$ 377,010$ 31,940,693$ 6,140,524$ 38,081,216$ 77,809,549$ 338,869$ 6.73% 433,024$ 597,418$ 76,112$ 3,458,871$ 3,677,411$ 218,541$ ($1,668,045)Dec-20 115,890,765$ 4,646,509$ 3,452,975$ 117,084,299$ 328,431$ 32,269,124$ 5,894,903$ 38,164,026$ 78,920,273$ 338,869$ 6.73% 439,614$ 606,510$ 76,112$ 3,644,503$ 3,875,557$ 231,054$ ($1,436,991)

423,496,149$ 306,411,850$ 47,006,380$ 12,199,295$ 34,199,170$ 53,423,034$ 12,007,874$ 335,627,714$ 334,190,724$ (1,436,991)$

4th Qtr Estimates

Attachment 5 Page 3 of 3Pepco - MarylandEmPower Maryland Surcharge WorkpaperC&I Energy Efficiency Programs

SECTION II - PRIOR YEAR TRUE UP

Table 4 - Prior Year Monthly Over/Under Recovered Balances

(1) (2) (3) (4) (5)= Table 3 Col 13 = Col 3 - Col 2

Actual Monthly Over/(Under)Revenue DSM Surcharge Over/(Under) Recovery

Month Requirement Revenue Recovery Cumulative Balance

Jan-19 3,888,199$ 3,652,787$ (235,411)$ 6,143,378$ Feb-19 3,757,411$ 3,339,272$ (418,139)$ 5,725,240$ Mar-19 3,442,322$ 3,063,620$ (378,703)$ 5,346,537$ Apr-19 3,267,940$ 2,912,087$ (355,853)$ 4,990,684$

May-19 3,930,379$ 2,999,560$ (930,819)$ 4,059,864$ Jun-19 3,697,017$ 3,219,969$ (477,048)$ 3,582,816$ Jul-19 4,316,051$ 3,595,447$ (720,604)$ 2,862,213$

Aug-19 4,810,404$ 4,209,744$ (600,660)$ 2,261,553$ Sep-19 4,217,025$ 3,673,657$ (543,368)$ 1,718,185$ Oct-19 3,830,547$ 3,337,467$ (493,080)$ 1,225,105$ Nov-19 3,183,602$ 2,747,478$ (436,123)$ 788,982$ Dec-19 3,591,906$ 3,080,689$ (511,217)$ 277,764$ Jan-20 3,338,084$ 3,133,431$ (204,653)$ 73,111$ Feb-20 3,097,344$ 2,844,402$ (252,942)$ (179,831)$ Mar-20 3,056,718$ 2,807,198$ (249,520)$ (429,351)$ Apr-20 2,726,813$ 2,478,426$ (248,387)$ (677,738)$

May-20 2,341,742$ 2,100,247$ (241,495)$ (919,234)$ Jun-20 2,943,606$ 2,664,506$ (279,100)$ (1,198,334)$ Jul-20 3,598,054$ 3,278,503$ (319,550)$ (1,517,885)$

Aug-20 3,611,091$ 3,289,452$ (321,639)$ (1,839,524)$ Sep-20 3,328,318$ 3,011,471$ (316,848)$ (2,156,371)$ Oct-20 3,798,644$ 4,068,430$ 269,786$ (1,886,586)$ Nov-20 3,458,871$ 3,677,411$ 218,541$ (1,668,045)$ Dec-20 3,644,503$ 3,875,557$ 231,054$ (1,436,991)$

SECTION III TABLE 5 - EMPOWER MD SURCHARGE (C&I EE&C COMPONENT) CALCULATION

Forecasted Amortization (Straight Line) * 44,770,723$ Table 2, Col 4Forecasted CCRF 7,852,322$ Table 2, Col 14Forecasted O&M Expense 1,097,959$ Table 2, Col 15Forecasted PJM Market Revenues (1,237,755)$ Table 2, Col 16Forecasted Fed Tax credit (4,066,432)$ Table 2, Col 11Prior Period True Up 1,436,991$ Table 4, Col 5Total Annual Amount to be Recovered 49,853,808$

Retail Sales - kwh 7,979,545,092$/KWH Surcharge 0.006248$ Gross Receipts Tax/PSC Assessment -$ $/KWH Surcharge 0.006248$

* Notes: (1) Approved CHP Incremental Cash Flow of $740,570 Q4 2020, $2,280,720 1/2021-12/2021(2) Approved 2020 carryover of $6,590,200 1/2021-12/2021(3) Approved DHCD program costs of $186,539 1/2021-12/2021

Pepco EmPower MD Surcharge Refile Package effective 030121 and filed 012721.pdfTIME METERED GENERAL SERVICE - PRIMARY SERVICESCHEDULE "GT 3A”Available for standby service when modified by Schedule "S".Not available for temporary service or supplementary loads metered separately from lighting and other usage in the same occupancy.Not available for railway propulsion service.CHARACTER OF SERVICESCHEDULE "CS"NET ENERGY METERINGRIDER "NEM"Kilowatt-hour Charge $ 0.02892 per kwhr $ 0.01586 per kwhrSchedule RSchedule R-TMTransmission Service ChargeKilowatt-hour Charge Included in Generation Service ChargeProcurement Cost Adjustment See www.pepco.com for currently effective rate.Note: Schedule R-TOU-P billing periods are as follows:Summer – Billing months are June through September, and On-Peak hours will be between the hours of 2:00 pm and 7:00 pm excluding weekends and holidays. All other hours are off-peak.Schedule GS and EVSchedule TSchedule SLSchedule OLSchedule MGT LV IISchedule MGT 3A IISchedule MGT LV IIISchedule MGT 3A IIISchedule GT LVSchedule GT 3ASchedule GT 3BSchedule TM-RTPUBLICATION OF PRICESAvailability

RIDER "ANEM"RIDER "CNM"MD Pepco Schedule effective 030121 EmPower MD Surcharge Proposed.pdfTIME METERED GENERAL SERVICE - PRIMARY SERVICESCHEDULE "GT 3A”Available for standby service when modified by Schedule "S".Not available for temporary service or supplementary loads metered separately from lighting and other usage in the same occupancy.Not available for railway propulsion service.CHARACTER OF SERVICESCHEDULE "CS"NET ENERGY METERINGRIDER "NEM"Kilowatt-hour Charge $ 0.02892 per kwhr $ 0.01586 per kwhrSchedule RSchedule R-TMTransmission Service ChargeKilowatt-hour Charge Included in Generation Service ChargeProcurement Cost Adjustment See www.pepco.com for currently effective rate.Note: Schedule R-TOU-P billing periods are as follows:Summer – Billing months are June through September, and On-Peak hours will be between the hours of 2:00 pm and 7:00 pm excluding weekends and holidays. All other hours are off-peak.Schedule GS and EVSchedule TSchedule SLSchedule OLSchedule MGT LV IISchedule MGT 3A IISchedule MGT LV IIISchedule MGT 3A IIISchedule GT LVSchedule GT 3ASchedule GT 3BSchedule TM-RTPUBLICATION OF PRICESAvailability

RIDER "ANEM"RIDER "CNM"

EmPower MD Surcharge Update (Attachment 2) Pepco refiling.pdfSummary

EmPower MD Surcharge (Attachments 4-5) Pepco refiling.pdfAttachment 4 Page 1 of 3Attachment 4 Page 2 of 3Attachment 4 Page 3 of 3Attachment 5 Page 1 of 3Attachment 5 Page 2 of 3Attachment 5 Page 3 of 3