Commonwealth Edison 8-K Exelon Reports Second Quarter 2019 Results

Q2 2019 GAAP Earnings $0.50 per share We have met or beaten1 the mid-point of our earnings guidance Adjusted earnings range for 16 of the past 18 quarters of $0.60 per share* MILESTONES & RECOGNITION OPERATIONAL METRICS 2019 Benchmarking Air Emissions Report Strong reliability metrics across our utilities The report determined that Exelon is the largest with ComEd in the top decile performance in zero-carbon power producer in the United States both CAIDI and SAIFI ComEd and PHI achieved top decile performance DiversityInc Top 50 in Service Level and Abandon Rate Exelon ranked 24th on DiversityInc's list of Top 50 BGE, ComEd and PECO recorded top decile companies for diversity, 4th of Top 10 companies for performance in Customer Satisfaction diverse leadership and 10th for the Top 17 companies in hiring for veterans Delmarva Power achieved the number one ranking in J.D. Power’s 2019 Electric Utility Residential Customer Satisfaction Study for the Fortune 500 East Midsize Region; first Exelon utility to rank first in residential survey Exelon ranked 93rd on the 2019 Fortune 500 list and has been on the list since 1995 Volunteerism Continued best-in-class performance across our generation fleet: National Volunteer Month 2019 95.1% 5,368 Q2 2019 Nuclear Capacity Factor² Employees volunteered 96.0% 18,250 Q2 2019 Renewables energy capture Total volunteer hours 99.7% Q2 2019 Power dispatch match 452 38.8 TWhs Total company-endorsed volunteer events Owned and operated Q2 2019 nuclear production² * For reconciliation of GAAP Net Income to Adjusted (non-GAAP) Operating Earnings, refer to the tables in our press release (1) Non-GAAP Earnings are used for setting guidance and comparing to actual results (2) Excludes Salem and EDF’s equity ownership share of the CENG joint venture