Letter Agreement, dated May 7, 2018, between Exelon Corporation and Jonathan W. Thayer

You have accepted the position of Chief Transformation Officer, and hereby resign from your current position as Chief Financial Officer and any other positions as an officer or director of the Company, its subsidiaries and affiliates effective as of May 8, 2018. You will remain employed in a senior executive position until April 1, 2019 or such other date as may be mutually agreed (the “Scheduled Separation Date”), provided, that your employment may end prior to the Scheduled Separation Date if it is terminated by the Company for Cause or you for Good Reason (as defined in the Exelon Corporation Senior Management Severance Plan, it being understood that the changes from your current position and duties to the position described in this letter and its related duties will not constitute Good Reason), or due to your resignation, disability or death. You represent and warrant that you have no knowledge, and the Company represents and warrants that its executive officers have no knowledge (assuming reasonable inquiry), of any of your acts or omissions as of the date of this letter that would qualify as Cause under the Exelon Corporation Senior Management Severance Plan (the “Plan”).

In addition to your best efforts in the performance of your duties as Chief Transformation Officer or such other position as may be agreed during this period of employment, you will assist with the orderly transition of your prior duties to your successor. In addition, your current annualized base salary and target annual incentive and long-term performance share opportunities will remain in effect, you and your eligible dependents will remain eligible to participate in the Company’s applicable employee benefit plans, your outstanding long-term incentive awards will continue to vest normally, and you will remain subject to the Company’s code of business conduct and other employment policies.

Because your condominium co-op board would not authorize the sale of your Chicago condominium to the Company’s relocation services firm in connection with your merger-related move to Washington D.C., upon the arms’ length sale of the condominium on or before the second anniversary of this

Upon the termination of your employment on the Scheduled Separation Date, you will receive non-change in control separation benefits pursuant to a separation agreement and waiver & release in accordance with the Plan applicable to senior executive management (within the meaning of the Plan).

This letter supersedes all prior agreements and understandings concerning your employment (except as incorporated herein by reference), including your Change in Control Employment Agreement dated October 26, 2016 other than the provisions of Article VIII (“Restrictive Covenants”) thereof.