DBRS Rates ComEd’s Issue of $450 Million First Mortgage Bonds at BBB, Trend Stable

DBRS has today assigned a rating of BBB with a Stable trend to the proposed $450 million, 6.45% First Mortgage Bonds (FMBs) Series 107 issue of Commonwealth Edison Company (ComEd or the Company). The FMBs will mature on January 15, 2038.

The FMBs will rank equally with all of ComEd’s other bonds now or hereafter outstanding under the mortgage. Proceeds from the new issue will be used to refinance maturing debt, to call and refinance trust preferred securities and for general corporate purposes.

The issue is expected to settle on January 16, 2008.

ComEd is a subsidiary of Exelon Corporation.

Notes:
All figures are in U.S. dollars unless otherwise noted.
This rating is based on public information.