Defined benefit plan, amounts increased (decrease) in regulatory liabilities, before tax

[Table of Contents](#i0fa971ac9e834218957059819155291f_10)Combined Notes to Consolidated Financial Statements(Dollars in millions, except per share data unless otherwise noted)  
Note 15 — Retirement Benefits

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|  |  |  |  | Operating Company(e) |
| Name of Plan: |  |  |   | ComEd |   | PECO |   | BGE |   | PHI |  | Pepco |  | DPL |  | ACE |  | Generation |
| OPEB Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| PECO Energy Company Retiree Medical Plan(a) |  |  |    | X |  | X |    | X |  | X |  | X |  | X |  | X |  | X |
| Exelon Corporation Health Care Program(a) |  |  |    | X |    | X |  | X |  | X |  | X |  | X |  | X |  | X |
| Exelon Corporation Employees’ Life Insurance Plan(a) |  |  |    | X |    | X |    | X |  |  |  |  |  |  |  |  |  | X |
| Exelon Corporation Health Reimbursement Arrangement Plan(a) |  |  |    | X |    | X |    | X |  |  |  |  |  |  |  |  |  | X |
| Constellation Energy Group, Inc. Retiree Medical Plan(b) |  |  |    | X |  | X |  | X |    | X |  | X |  | X |  |  |  | X |
| Constellation Energy Group, Inc. Retiree Dental Plan(b) |  |  |    |  |  |  |  | X |    |  |  |  |  |  |  |  |  | X |
| Constellation Energy Group, Inc. Employee Life Insurance Plan and Family Life Insurance Plan(b) |  |  |    | X |  |  |  | X |    | X |  | X |  | X |  |  |  | X |
| Constellation Mystic Power, LLC Post-Employment Medical Account Savings Plan(b) |  |  |    |  |  |  |  | X |  |  |  |  |  |  |  |  |  | X |
| Exelon New England Union Post-Employment Medical Savings Account Plan(a) |  |  |    |  |  |  |  |  |  |  |  |  |  |  |  |  |  | X |
| Retiree Medical Plan of Constellation Energy Nuclear Group, LLC(c) |  |  |  | X |  |  |  | X |  | X |  |  |  |  |  |  |  | X |
| Retiree Dental Plan of Constellation Energy Nuclear Group, LLC(c) |  |  |  | X |  |  |  | X |  | X |  |  |  |  |  |  |  | X |
| Nine Mile Point Nuclear Station, LLC Medical Care and Prescription Drug Plan for Retired Employees(c) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | X |
| Pepco Holdings LLC Welfare Plan for Retirees(d) |  |  |  | X |  | X |  | X |  | X |  | X |  | X |  | X |  | X |

\_\_\_\_\_\_\_\_\_\_(a)These plans are collectively referred to as the legacy Exelon plans.(b)These plans are collectively referred to as the legacy Constellation Energy Group (CEG) Plans.(c)These plans are collectively referred to as the legacy CENG plans.(d)These plans are collectively referred to as the legacy PHI plans.(e)Employees generally remain in their legacy benefit plans when transferring between operating companies.Exelon’s traditional and cash balance pension plans are intended to be tax-qualified defined benefit plans. Exelon has elected that the trusts underlying these plans be treated as qualified trusts under the IRC. If certain conditions are met, Exelon can deduct payments made to the qualified trusts, subject to certain IRC limitations. Benefit Obligations, Plan Assets, and Funded StatusDuring the first quarter of 2021, Exelon received an updated valuation of its pension and OPEB to reflect actual census data as of January 1, 2021. This valuation resulted in an increase to the pension obligations of $33 million and a decrease to the OPEB obligations of $9 million. Additionally, accumulated other comprehensive loss increased by $1 million (after-tax) and regulatory assets and liabilities increased by $21 million and $1 million, respectively.  
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