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1 John C. Frain Director Regulatory Strategy & Revenue Policy P.O. Box 1475 Baltimore, Maryland Telephone Fax Via Electronic Filing April 28, 2017 David J. Collins, Executive Secretary Public Service Commission of Maryland William Donald Schaefer Tower 6 Saint Paul Street, 16 th Floor Baltimore, Maryland Re: Case Nos. 9056/ Revisions to P.S.C. Md. E-6 Residential, Type I and Type II Standard Offer Generation Market-Priced Service; and Revisions to P.S.C. Md. E-6 SOS Retail Transmission s Dear Mr. Collins: Baltimore Gas and Electric Company (BGE) files herewith Supplement 605 to P.S.C. Md. E-6, BGE s Retail Electric Service Tariff. Based on results from the April 24, 2017 procurement process, this filing revises Rider 1 Standard Offer Service (SOS) to include the Residential, Type I and Type II rates, Schedule PL Private Area Lighting, and Schedule EV Electric Vehicle TOU rates. The Residential, Type I, and Schedule EV rates cover the period October 1, 2017 through May 31, The Schedule PL Type I rates are effective June 1, 2017 through May 31, Type II rates are effective June 1, 2017 through August 31, These rates were approved by the Maryland Public Service Commission in Order No issued April 28, 2017 in the above-referenced Cases. Under Rider 1, the SOS Administrative Charges are subject to adjustment in the February, June and October billing months to reflect the estimated incremental, uncollectible and cash working capital costs of providing Residential, Type I, Type II and Hourly Service. Effective June 2017, the Company performed its first true-ups of actual incremental, uncollectible, and cash working capital costs to the estimated costs of providing Residential, Type I, Type II and Hourly Service. Any over- or under-collection of costs compared to the estimated costs for the program year are included in the projected Rider 1 rates herein. With this filing, the total SOS Administrative Charges for Residential, Type I and Type II, and Hourly Service will change effective with June 2017 bills from 2.94 mills per kwh, 1.74 mills per kwh, 1.74 mills per kwh, and 0.79 mills per kwh to 2.63 mills per kwh, 1.75 mills per kwh, 1.64 mills per kwh and 0.64 mills per kwh, respectively. The individual proposed cost components of BGE s Administrative Charge for Residential, Type I, Type II and Hourly Service customers are shown below. The Rider 1 Administrative Charges are also inclusive of the cumulative balances remaining from the Rider 10 rates in place through May 2017.

3 Attachment 1 Rider 1 Standard Offer Service and Schedule PL (Private Area Lighting) s Clean and Redlined Tariff Pages

4 77-A Electric Retail Baltimore Gas and Electric Company Baltimore Gas & Electric Company Current Market-Priced Service Components (Transmission s Effective June 1, 2017) Generation Transmission Total SOS Energy Admin. Charge Applicable Total Generation Transm. incl. GRT, PSC Assess. Transm. incl. GRT, PSC Assess. $/kw 1 Taxes 2 RESIDENTIAL Schedule R June 1, Sept. 30, Oct. 1, May 31, Schedule RL June 1, Sept. 30, 2017 On-Peak June 1, Sept. 30, 2017 Inter.-Peak June 1, Sept. 30, 2017 Off-Peak Oct. 1, May 31, 2018 On-Peak Oct. 1, May 31, 2018 Inter.-Peak Oct. 1, May 31, 2018 Off-Peak Schedule EV June 1, Sept. 30, 2017 On-Peak June 1, Sept. 30, 2017 Off-Peak Oct. 1, May 31, 2018 On-Peak Oct. 1, May 30, 2018 Off-Peak COMMERCIAL & INDUSTRIAL Scheds. G/GU -Type I SOS June 1, Sept. 30, Oct. 1, May 31, Sched. GS - Type I SOS June 1, Sept. 30, 2017 On-Peak June 1, Sept. 30, 2017 Inter.-Peak June 1, Sept. 30, 2017 Off-Peak Oct. 1, May 31, 2018 On-Peak Oct. 1, May 31, 2018 Inter.-Peak Oct. 1, May 31, 2018 Off-Peak Total Total $/kw Sched. SL - Type I SOS 3 Jun. 1, May 31, Sched. PL - Type I SOS 3 Jun. 1, May 31, Sched. G - Type II SOS Jun. 1, Aug. 31, Sched. GS - Type II SOS Jun. 1, Aug. 31, 2017 On-Peak Energy Jun. 1, Aug. 31, 2017 Inter-Peak Energy Jun. 1, Aug. 31, 2017 Off-Peak Energy Scheds. GL, P & T - Type II SOS Jun. 1, Aug. 31, 2017 On-Peak Energy Jun. 1, Aug. 31, 2017 Inter-Peak Energy Jun. 1, Aug. 31, 2017 Off-Peak Energy Scheds. GL, P & T - Type II SOS Transmission Demand Charge Note: 1 The Adminstrative Charge rates typically change every February, June and October. 2 Tax s: Gross Receipts Tax (GRT) = 2% (Transmission only) PSC Assessment = % 3 Charge per lamp-watt ( /lamp-watt) = x = /lamp-watt; Sch. PL rate reflected in lamp fixture and renewal rates Total SOS rates exclude Rider 8 - Energy Cost Adjustment Hourly Administrative Charge = effective June 2017 P. S. C. Md. E-6 (Suppl. 605) Filed 04/28/17 Effective 06/01/17

5 Baltimore Gas and Electric Company Electric -- Retail 57 PRIVATE AREA LIGHTING ELECTRIC SCHEDULE P L AVAILABILITY: For unmetered outdoor area lighting of private property. MONTHLY RATES: 1. For supply of controlled electricity installation and maintenance of overhead supplied lamp fixtures and lamp renewals as required for each Mercury Vapor (limited to existing installations) w MV Pendant $ w MV Pendant w MV Pend/Flood , w MV Pendant Sodium Vapor w SV Flood (limited to existing installations) w SV Pendant w SV Pendant w SV Pendant w SV Pend/Flood , w SV Pendant Metal Halide (limited to existing installations) w MH Pulse Teardrop w MH Pulse Pendant w MH Pendant w MH Spot or Flood w MH Pendant w MH Pulse Flood/Spot w MH Pulse Pendant Gray , w MH Pend/Flood Where longer than 4-foot upsweep arms are required for such lighting supply, add 3.68 For each span of overhead wires required on existing and additional poles 1.60 For the installation and maintenance of overhead-supplied lamp poles each additional standard distribution wood pole For supply of controlled electricity installation and maintenance of underground-supplied lamp fixtures and lamp renewals as required for each Mercury Vapor (limited to existing installations) w MV Modern/Colonial $ w MV Pend/Flood Sodium Vapor w SV Colonial Modern (limited to existing installations) w SV Flood (limited to existing installations) w SV Gothic Continued on Next Page P. S. C. Md. -- E-6 (Suppl. 605) Filed 04/28/17 - Effective 06/01/17

6 58 Baltimore Gas and Electric Company Electric -- Retail Schedule PL Continued w SV Acorn w SV Acorn Havre de Grace w SV Colonial Premiere w SV Acorn Maple Lawn w SV Pendant w SV Modern/Colonial w SV Pendant w SV Rectilinear w SV Acorn w SV Gothic w SV Acorn Victorian (limited to existing installations) w SV Colonial Premiere w SV Acorn Havre de Grace w SV Acorn Maple Lawn w SV Tear Drop w SV Pendant w SV Tear Drop w SV Pend/Flood w SV Rectilinear , w SV Pendant Metal Halide (limited to existing installations) w MH Colonial w MH Acorn Maple Lawn w MH Acorn Havre de Grace w MH Acorn w MH Gothic w MH Towson green w MH Pulse Acorn Maple Lawn w MH Pulse Modern w MH Pulse Pendant w MH Pulse Acorn w MH Pulse Acorn Havre de Grace w MH Pulse Colonial w MH Pulse Gothic w MH Pulse Colonial Premiere w MH Pulse Rectilinear w MH Pulse Teardrop w MH Acorn w MH Colonial Premiere w MH Up Lighting w MH Gothic w MH Modern w MH Pendant w MH Rectilinear w MH Acorn Havre de Grace w MH Acorn Maple Lawn w MH Colonial Premiere w MH Pulse Rectilinear w MH Pulse Flood Continued on Next Page P. S. C. Md. -- E-6 (Suppl. 605) Filed 04/28/17 - Effective 06/01/17

7 Baltimore Gas and Electric Company Electric Retail w MH Pulse Pendant Bronze w MH Pulse Pendant Gray w MH Flood w MH Pendant w MH Rectilinear w MH Pendant , w MH Pend/Flood , w MH Rectilinear Where longer than 4-foot upsweep arms are required on 35-foot embedded wood poles for such lighting supply, add Lamp Fixtures LED fixtures Light-Emitting Diode* LED 70 Pendant - 39 LED 100 Pendant - 51 LED 100 Pendant - LED 100 Post Top Acorn LED 100 Post Top Arlington LED 100 Post Top Colonial LED 100 Post Top Modern LED 100 Post Top Decorative Acorn LED 100 Premiere Colonial LED 150 Pendant - LED 150 Pendant - 88 LED 150 Post Top Arlington LED 150 Post Top Colonial LED 150 Post Top Acorn LED 150 Post Top Decorative Acorn LED 150 Tear Drop LED 150 Premiere Colonial LED 250 Pendant LED 250 Pendant LED 250 Tear Drop LED 400 Pendant LED 400 Pendant LED 400 Floodlight LED 1000 Floodlight *LED naming based on HID equivalent lamp watts 4. For the installation and maintenance of underground supplied lamp poles and cables each 12-foot square wood standard embedded post-top pole $15.66 each 12 foot fiberglass pole each 12-foot fiberglass pole with shroud each 14 foot fiberglass pole each 14-foot embedded fiberglass post-top pole each 14-foot fiberglass hinged pole each 14-foot fluted black fiberglass pole each 19-foot underground pole each 20-foot round embedded bronze fiberglass pole each 30-foot round bronze finished each 23 foot fiberglass pole with shroud each 25-foot embedded metal pole each 30-foot embedded metal pole each 30-foot round embedded bronze fiberglass each 30-foot round embedded bronze-fiberglass pole (incl. 1 arm) Continued on Next Page P. S. C. Md. -- E-6 (Suppl. 605) Filed 04/28/17 - Effective 06/01/17

8 77-A Electric Retail Baltimore Gas and Electric Company Baltimore Gas & Electric Company Current Market-Priced Service Components (Transmission s Effective June 1, 2016) (Transmission s Effective June 1, 2017) Generation Transmission Total SOS Energy Admin. Charge 1 Applicable Taxes 21 Total Generation Transm. incl. GRT, PSC Assess. Transm. incl. GRT, PSC Assess. $/kw RESIDENTIAL Schedule R Feb. 1, May 31, June 1, Sept. 30, Oct. 1, May 31, Schedule RL Feb. 1, May 31, 2017 On-Peak Feb. 1, May 31, 2017 Inter-Peak Feb. 1, May 31, 2017 Off-Peak June 1, Sept. 30, 2017 On-Peak June 1, Sept. 30, 2017 Inter.-Peak June 1, Sept. 30, 2017 Off-Peak Oct. 1, May 31, 2018 On-Peak Oct. 1, May 31, 2018 Inter.-Peak Oct. 1, May 31, 2018 Off-Peak Schedule EV Feb. 1, May 31, 2017 On-Peak Feb. 1, May 31, 2017 Off-Peak June 1, Sept. 30, 2017 On-Peak June 1, Sept. 30, 2017 Off-Peak June 1, Sept. 30, 2017 On-Peak June 1, Sept. 30, 2017 Off-Peak Oct. 1, May 31, 2018 On-Peak Oct. 1, May 30, 2018 Off-Peak COMMERCIAL & INDUSTRIAL Scheds. G/GU -Type I SOS Feb. 1, May 31, June 1, Sept. 30, Oct. 1, May 31, Sched. GS - Type I SOS Feb. 1, May 31, 2017 On-Peak Feb. 1, May 31, 2017 Inter-Peak Feb. 1, May 31, 2017 Off-Peak June 1, Sept. 30, 2017 On-Peak June 1, Sept. 30, 2017 Inter.-Peak June 1, Sept. 30, 2017 Off-Peak Oct. 1, May 31, 2018 On-Peak Oct. 1, May 31, 2018 Inter.-Peak Oct. 1, May 31, 2018 Off-Peak Total Total $/kw Sched. SL - Type I SOS 32 Feb. 1, May 31, Jun. 1, May 31, Sched. PL - Type I SOS 32 Feb. 1, May 31, Jun. 1, May 31, Sched. G - Type II SOS Mar. 1, May 31, Jun. 1, Aug. 31, Sched. GS - Type II SOS Mar. 1, May 31, 2017 On-Peak Energy Mar. 1, May 31, 2017 Inter-Peak Energy Mar. 1, May 31, 2017 Off-Peak Energy Jun. 1, Aug. 31, 2017 On-Peak Energy Jun. 1, Aug. 31, 2017 Inter-Peak Energy Jun. 1, Aug. 31, 2017 Off-Peak Energy Scheds. GL, P & T - Type II SOS Mar. 1, May 31, 2017 On-Peak Energy Mar. 1, May 31, 2017 Inter-Peak Energy Mar. 1, May 31, 2017 Off-Peak Energy Jun. 1, Aug. 31, 2017 On-Peak Energy Jun. 1, Aug. 31, 2017 Inter-Peak Energy Jun. 1, Aug. 31, 2017 Off-Peak Energy Scheds. GL, P & T - Type II SOS Transmission Demand Charge Transmission Demand Charge Note: 1 The Adminstrative Charge rates typically change every February, June and October. 21 Tax s: Gross Receipts Tax (GRT) = 2% (Transmission only) PSC Assessment = % PSC Assessment (Type II s effective Dec. 1, 2016) = % 2 Charge per lamp-watt ( /lamp-watt) = x = /lamp-watt; Sch. PL rate reflected in lamp fixture and renewal rates 3 Charge per lamp-watt ( /lamp-watt) = x = /lamp-watt; Sch. PL rate reflected in lamp fixture and renewal rates Total SOS rates exclude Rider 8 - Energy Cost Adjustment Hourly Administrative Charge = effective February 2017 Hourly Administrative Charge = effective June 2017 P. S. C. Md. E-6 (Suppl ) Filed 02/06/201704/28/17 Effective 03/01/1706/01/17

9 Baltimore Gas and Electric Company Electric -- Retail 57 PRIVATE AREA LIGHTING ELECTRIC SCHEDULE P L AVAILABILITY: For unmetered outdoor area lighting of private property. MONTHLY RATES: 1. For supply of controlled electricity installation and maintenance of overhead supplied lamp fixtures and lamp renewals as required for each Mercury Vapor (limited to existing installations) w MV Pendant $ w MV Pendant w MV Pend/Flood , w MV Pendant Sodium Vapor w SV Flood (limited to existing installations) w SV Pendant w SV Pendant w SV Pendant w SV Pend/Flood , w SV Pendant Metal Halide (limited to existing installations) w MH Pulse Teardrop w MH Pulse Pendant w MH Pendant w MH Spot or Flood w MH Pendant w MH Pulse Flood/Spot w MH Pulse Pendant Gray , w MH Pend/Flood Where longer than 4-foot upsweep arms are required for such lighting supply, add 3.68 For each span of overhead wires required on existing and additional poles 1.60 For the installation and maintenance of overhead-supplied lamp poles each additional standard distribution wood pole For supply of controlled electricity installation and maintenance of underground-supplied lamp fixtures and lamp renewals as required for each Mercury Vapor (limited to existing installations) w MV Modern/Colonial $ w MV Pend/Flood Sodium Vapor w SV Colonial Modern (limited to existing installations) w SV Flood (limited to existing installations) w SV Gothic Continued on Next Page P. S. C. Md. -- E-6 (Suppl ) Filed 01/06/1704/28/17 - Effective 02/06/1706/01/17

10 58 Baltimore Gas and Electric Company Electric -- Retail Schedule PL Continued w SV Acorn w SV Acorn Havre de Grace w SV Colonial Premiere w SV Acorn Maple Lawn w SV Pendant w SV Modern/Colonial w SV Pendant w SV Rectilinear w SV Acorn w SV Gothic w SV Acorn Victorian (limited to existing installations) w SV Colonial Premiere w SV Acorn Havre de Grace w SV Acorn Maple Lawn w SV Tear Drop w SV Pendant w SV Tear Drop w SV Pend/Flood w SV Rectilinear , w SV Pendant Metal Halide (limited to existing installations) w MH Colonial w MH Acorn Maple Lawn w MH Acorn Havre de Grace w MH Acorn w MH Gothic w MH Towson green w MH Pulse Acorn Maple Lawn w MH Pulse Modern w MH Pulse Pendant w MH Pulse Acorn w MH Pulse Acorn Havre de Grace w MH Pulse Colonial w MH Pulse Gothic w MH Pulse Colonial Premiere w MH Pulse Rectilinear w MH Pulse Teardrop w MH Acorn w MH Colonial Premiere w MH Up Lighting w MH Gothic w MH Modern w MH Pendant w MH Rectilinear w MH Acorn Havre de Grace w MH Acorn Maple Lawn w MH Colonial Premiere w MH Pulse Rectilinear w MH Pulse Flood Continued on Next Page P. S. C. Md. -- E-6 (Suppl ) Filed 01/06/1704/28/17 - Effective 02/06/1706/01/17

11 Baltimore Gas and Electric Company Electric Retail w MH Pulse Pendant Bronze w MH Pulse Pendant Gray w MH Flood w MH Pendant w MH Rectilinear w MH Pendant , w MH Pend/Flood , w MH Rectilinear Where longer than 4-foot upsweep arms are required on 35-foot embedded wood poles for such lighting supply, add Lamp Fixtures LED fixtures Light-Emitting Diode* LED 70 Pendant - 39 LED 100 Pendant - 51 LED 100 Pendant - LED 100 Post Top Acorn LED 100 Post Top Arlington LED 100 Post Top Colonial LED 100 Post Top Modern LED 100 Post Top Decorative Acorn LED 100 Premiere Colonial LED 150 Pendant - LED 150 Pendant - 88 LED 150 Post Top Arlington LED 150 Post Top Colonial LED 150 Post Top Acorn LED 150 Post Top Decorative Acorn LED 150 Tear Drop LED 150 Premiere Colonial LED 250 Pendant LED 250 Pendant LED 250 Tear Drop LED 400 Pendant LED 400 Pendant LED 400 Floodlight LED 1000 Floodlight *LED naming based on HID equivalent lamp watts For the installation and maintenance of underground supplied lamp poles and cables each 12-foot square wood standard embedded post-top pole $15.66 each 12 foot fiberglass pole each 12-foot fiberglass pole with shroud each 14 foot fiberglass pole each 14-foot embedded fiberglass post-top pole each 14-foot fiberglass hinged pole each 14-foot fluted black fiberglass pole each 19-foot underground pole each 20-foot round embedded bronze fiberglass pole each 30-foot round bronze finished each 23 foot fiberglass pole with shroud each 25-foot embedded metal pole each 30-foot embedded metal pole each 30-foot round embedded bronze fiberglass each 30-foot round embedded bronze-fiberglass pole (incl. 1 arm) Continued on Next Page P. S. C. Md. -- E-6 (Suppl ) Filed 02/03/1704/28/17 - Effective 03/06/1706/01/17

12 Attachment 2 Development of the Retail Transmission s

13 BGE SOS Retail Transmission s June May 2018 Period Prepared: April 24, 2017 R RL G/GU GS GL/P (a) Eligible Transmission PLC (MW) 3, ,278.0 (b=a*c) SOS Transmission PLC (MW) 2, (c) Retention 74.4% 71.2% 52.0% 16.0% 18.9% (d) Eligible Volume Forecast (MWh) 11,414, ,295 2,710, ,947 6,768,156 (e) SOS Volume Forecast (MWh) 8,437, ,134 1,343,209 38,958 1,256,418 (f=e/d) Retention Forecast 73.9% 71.7% 49.6% 18.0% 18.6% (g) Eligible Billing Demand Forecast (MW, 12Months) n/a n/a n/a n/a 17,564 (h) SOS Billing Demand Forecast (MW, 12Months) n/a n/a n/a n/a 3,268 (i=h/g) Retention Forecast n/a n/a n/a n/a 18.6% (j) NITS ($/MWYear) $ 32,851 $ 32,851 $ 32,851 $ 32,851 $ 32,851 (k=j*b) SOS NITS Charge Forecast ($) $ 80,795,554 $ 5,678,458 $ 9,735,102 $ 243,224 $ 7,947,603 (l) POLR Non Firm Pt to Pt Credits Forecast (Sch 8) $ (106,462) $ (7,482) $ (12,828) $ (320) $ (10,4) (m) Transmission Enhancement (Sch 12) $ 12,320,341 $ 865,896 $ 1,484,485 $ 37,089 $ 1,211,913 (n) Transmission Expansion Cost Recovery (Sch 13) $ - $ - $ - $ - $ - (o) Net Charge Forecast $ 93,009,433 $ 6,536,871 $ 11,206,759 $ 279,992 $ 9,149,043 (p) PSC / GRT Tax % % % % % q=o/e/(1-p) ($/MWh) - Grossed up for Taxes $ $ $ 8.53 $ 7.35 n/a r=o/h/(1-p) ($/MWMonth) Grossed up for Taxes n/a n/a n/a n/a $ 2, s=q/1000 ($/kwh) $ $ $ $ n/a t=r/1000 ($/kwmonth) n/a n/a n/a n/a $2.86

SYSTEM BRIEF DAILY SUMMARY

SYSTEM BRIEF DAILY SUMMARY SYSTEM BRIEF SUMMARY * ANNUAL (PEAK HOURS 7:00 AM TO 10:00 PM MON-SAT) MaxTemp NEL (MWH) Hr Ending Hr Ending LOAD ENERGY (MWH) INCREMENTAL COST DAY DATE Civic TOTAL MAXIMUM @Max MINIMUM @Min FACTOR ON