Commonwealth Edison 8-K Exelon Reports Fourth Quarter and Full Year 2018 Results

Exelon Corporation Year End Review 2018 THIS YEAR GAAP Earnings $2.07 per share 2018 Total Shareholder Return of ~18% percent Increased annual dividend 5% to $1.45 for 2019 Adjusted earnings Outperformed the utility sector index three of $3.12 per share* consecutive years 2 0 1 8 H IGH LIGH T S & P E R F ORMA NCE Exelon Utilities Exelon Generation Grid Investment 159 TWhs $5.5 billion Owned and operated 2018 production to replace aging infrastructure and was best on record improve reliability to the benefit of customers in 2018 94.6% 2018 nuclear capacity factor All four utilities have top quartile performance for SAIFI (outage frequency) 96.1% ComEd and PHI scored in the top decile 2018 Renewables energy capture for service level with BGE and PHI achieving best on record performances 98.1% Top decile gas odor response for the 6th 2018 Power dispatch match consecutive year for BGE and PECO & 2nd consecutive year for PHI Commitment to Community ComEd, BGE and PHI had best performances on record in Call Center Satisfaction more than Milestones & Recognition $51 million giving to nonprofits ZEC more than zero emissions certificate (ZEC) legislation for New Jersey signed by Governor Murphy 240,000 and legality of Illinois’ and New York’s employee volunteer hours, programs upheld in 2018 by the 7th and 2nd breaking all previous records circuit courts, respectively Diversity & Inclusion HeForShe named best company for Diversity by Forbes, Successfully launched STEM Innovation Black Enterprise Magazine, DiversityInc and Leadership Academy for teen girls in Human Rights Campaign in 2018 Chicago & Washington, D.C. as part of ongoing UN Women HeForShe commitment One of two U.S. utilities to receive an A- from the Carbon Disclosure Project * For reconciliation of GAAP Net Income to Adjusted (non-GAAP) Operating Earnings, refer to the tables in our press release. Non-GAAP Earnings are used for setting guidance and comparing to actual results.