Baltimore Gas and Electric Company Gas Administrative Charge Calculations November October 2019

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2 PART 2 Rider 12 - Gas Administrative Charge Adder Target Amount Estimated Commodity Sales Volumes (therms) GAC Adder ($/therm) Nov 18 - Oct 19 Nov 18 - Oct 19 Nov 18 - Oct 19 a b c=a/b Credit and Collections 1 $ 1,900, ,876, Billing 2 $ 1,818, ,876, Storage Inventory Carrying Costs 3 $ 2,173, ,876, Commodity CWC 4 $ 482, ,876, Gross Up Rates Uncollectible Expense % PSC Assessment % Notes 1 See Attachment A. 2 See Attachment B. 3 See Attachment C. 4 See Attachment D. 5 The Gross Up Rate for Uncollectible Expense was calculated in BGE's July 29, 2016 GAC filing (ML # ), which was approved by the Commission in a letter order dated August 31, This rate will not change until an order is issued in BGE's next gas base rate proceeding. 6 PSC Assessment as of this instant filing. The actual PSC Assessment rate in effect the month the MBR is filed will be used to gross up the Gas Commodity Price.

3 Credit and Collections ATTACHMENT A Credit and Collections Expense A Total Gas Revenue from End Users 1 CN 9406 Supp III.V(c) $ 625,953,961 B Gas Commodity Revenue Included in A CN 9406 Supp III.V(d) $ 227,076,859 C Percentage of Gas Commodity Revenue to Total Gas B / A 36.28% Revenue from End Users D CN 9406 Gas Credit and Collections Expense CN 9406 Gas allocation of total costs $ 5,530,942 E Estimated Gas Commodity Revenue Portion of Cost in D Above C x D $ 2,006,626 F Rider 12 - Gas Administrative Charge Credit and Collections Adder E $ 2,006,626 F1 Nov-17-Oct-18 Credit and Collections Target 09/22/17 and 03/01/18 GAC Filings $ 2,260,139 G Nov-17-Oct-18 Actual Sales Volumes - Firm (therms) 2 458,720,585 H Nov-17-Oct-18 Credit and Collections GAC Adders ($/therm) 09/22/17 and 03/01/18 GAC Filings I Nov-17-Oct-18 Actual Credit and Collections G x H $ 2,385,347 J Nov-17-Oct-18 True-up for volumes F1 - I $ (125,208) J1 Sep and Oct-17 True-up for volumes Att A-1 $ 19,271 K Nov 18 - Oct 19 Credit and Collections Target F + J + J1 $ 1,900,689 Notes 1 Excludes Other Gas Revenues and Off System Sales 2 Nov Aug 2018 Based on 10 months actual Sep Oct months estimated

4 Credit and Collections September and October-17 Volume True-Up Attachment A-1 Estimated Actual Credit & Difference Volume Volume Difference Collections Rate Estimate - Actual (therms) (therms) (therms) ($/therm) a b c = a - b d e = c x d Sep-17 8,839,666 10,266,620 (1,426,954) $ (7,420) Oct-17 20,394,433 15,261,490 5,132, $ 26,691 $ 19,271 Note: Below are the amounts that will be used in next year's filing to true-up September and October current estimates: Therms September ,040,390 October ,727,254

5 Billing Attachment B A Nov 18 - Oct 19 Estimated # of Bills 6,360,563 CN 8950 B Price per bill Stip & Agreement $ C Nov 18 - Oct 19 Preliminary Estimated Billing Target A x B $ 1,920,890 D Nov-17-Oct-18 Billing Target (from previous filing) $ 2,152,611 E Nov-17-Oct-18 Actual # of Bills 1 6,304,996 F Nov-17-Oct-18 Estimated # of Bills (from previous filing) 6,243,972 G Difference E - F 61,024 CN 8950 H Price per bill Stip & Agreement $ I Nov-17-Oct-18 Adjustment to Billing Target G x H $ 18,429 J Nov-17-Oct-18 Actual Billing Target D + I $ 2,171,040 K Nov-17-Oct-18 Actual Sales Volumes - Firm (therms) 1 458,720,585 L Nov-17-Oct-18 Billing Adder Rate 09/22/17 and 03/01/18 GAC Filings $ M Nov-17-Oct-18 Actual Billing Revenue K x L $ 2,293,603 N Nov-17-Oct-18 True-up J - M $ (122,563) O Sep and Oct-17 True-up for Volumes Att B-1 $ 17,789 P Sep and Oct-17 True-up for # of bills Att B-1 $ 2,391 Q Nov 18 - Oct 19 Adjusted Billing Target C + N + O + P $ 1,818,507 Note 1 Nov Aug 2018 Based on 10 months actual Sep Oct months estimated

6 Billing True-Up September and October-17 Attachment B-1 Commodity Volumes Commodity Adjusted Commodity Estimated Actual Difference Adder Billing Revenue (therms) (therms) (therms) ($/therm) a b c = a - b d e = c x d Sep-17 8,839,666 10,266,620 (1,426,954) $ (6,849) Oct-17 20,394,433 15,261,490 5,132, $ 24,638 $ 17,789 Number of Bills Commodity Adjusted Billing Estimated Actual Difference Price Target Revenue $/bill f g h = f - g i j = h x i Sep , ,395 3, $ 1,183 Oct , ,824 4, $ 1,209 $ 2,391 Note: Below are the amounts that will be used in next year's filing to true-up September and October current estimates: Bills Therms September ,837 10,040,390 October ,267 20,727,254

7 Storage Inventory Carrying Costs (SICC) Attachment C Storage Inventory Carrying Costs Calculation A 12 Month Target Amount 1 09/22/17 and 03/01/18 GAC Filings $ 2,484,472 B Nov-17-Oct-18 Actual Sales Volumes (therms) 2 458,720,585 C Nov-17-Oct-18 SICC Adder ($/therm) 09/22/17 and 03/01/18 GAC Filings / D Nov-17-Oct-18 Actual SICC Revenue 3 B x C $ 2,630,633 E Storage Inventory Carrying Costs True-Up A - D $ (146,161) 13-Months Avg. - FERC Acct F Average Interstate Pipeline Storage Balance Jul 2017 to Jul 2018 $ 24,881,026 G After-tax ROR 03/01/2018 GAC Filing % H Income Tax Gross-Up Factor 03/01/2018 GAC Filing I Grossed-Up ROR G/H 9.23% J Storage Inventory Carrying Costs Portion for F above F x I $ 2,296,519 J1 Sep and Oct-17 True-up for volumes Att C-1 $ 23,348 K Nov 18 - Oct 19 SICC Target Amount E + J + J1 $ 2,173,705 Notes Volume (therms) Rate Target 1 Nov 2017 through Mar 2018 Target 335,614,183 $ $ 1,980,124 Apr 2018 through Oct 2018 Target 96,990,104 $ $ 504,349 $ 2,484,472 2 Nov Aug 2018 Based on 10 months actual Sep Oct months estimated Volume (therms) Rate Revenue 3 Nov 2017 through Mar 2018 Revenue 350,409,090 $ $ 2,067,414 Apr 2018 through Oct 2018 Revenue 108,311,495 $ $ 563,220 $ 2,630,633

8 Storage and Inventory Carrying Costs (SICC) September and October-17 Volume True-Up Attachment C-1 Estimated Actual Storage & Inventory Difference Volume Volume Difference Carrying Cost Rate Estimate - Actual (therms) (therms) (therms) ($/therm) a b c = a - b d e = c x d Sep-17 8,839,666 10,266,620 (1,426,954) $ (8,990) Oct-17 20,394,433 15,261,490 5,132, $ 32,338 $ 23,348 Note: Below are the amounts that will be used in next year's filing to true-up September and October current estimates: Therms September ,040,390 October ,727,254

9 Baltimore Gas & Electric Company Commodity Cash Working Capital (CCWC) Attachment D Commodity Cash Working Capital Calculation A 12 Month Target Amount 1 09/22/17 and 03/01/18 GAC Filings $ 456,467 B Nov-17-Oct-18 Actual Sales Volumes (therms) 2 458,720,585 C Nov-17-Oct-18 CCWC Adder ($/therm) 09/22/17 and 03/01/18 GAC Filings / D Nov-17-Oct-18 Actual CCWC Revenue 3 B x C $ 482,930 E CCWC True-Up A - D $ (26,464) F Commodity Cash Working Capital Asset 4 $ 5,476,807 G After-tax ROR 03/01/2018 GAC Filing % H Income Tax Gross-Up Factor 03/01/2018 GAC Filing I Grossed-Up ROR G/H 9.23% J Commodity Cash Working Capital Portion for F above I x F $ 505,509 J1 Sep and Oct-17 True-up for volumes Att D-1 $ 3,706 K Nov 18 - Oct 19 CCWC Target Amount E + J + J1 $ 482,752 Notes Volume (therms) Rate Target 1 Nov 2017 through Mar 2018 Target 335,614,183 $ $ 369,176 Apr 2018 through Oct 2018 Target 96,990,104 $ $ 87,291 $ 456,467 2 Nov Aug 2018 Based on 10 months actual Sep Oct months estimated Volume (therms) Rate Revenue 3 Nov 2017 through Mar 2018 Revenue 350,409,090 $ $ 385,450 Apr 2018 through Oct 2018 Revenue 108,311,495 $ $ 97,480 $ 482,930 4 Calculation follows: 8.6 Lag Days (CN9406. See DMV-6 Actual, page 1 of 9) $ 636,838 (Average Daily Gas Purchased for Resale Expense for 12 Months ended July 2018) $ 5,476,807 5 The calculations of the After-tax ROR and Income Tax Gross-Up Factor can be found in Part 1, Attach. E of the 03/01/2018 GAC Filing

10 Commodity Cash Working Capital (CCWC) September and October-17 Volume True-Up Attachment D-1 Estimated Actual Commodity Difference Volume Volume Difference CWC Rate Estimate - Actual (therms) (therms) (therms) ($/therm) a b c = a - b d e = c x d Sep-17 8,839,666 10,266,620 (1,426,954) $ (1,427) Oct-17 20,394,433 15,261,490 5,132, $ 5,133 $ 3,706 Note: Below are the amounts that will be used in next year's filing to true-up September and October current estimates: Therms September ,040,390 October ,727,254