Filed Pursuant to Rule 433
Registration Statement No. 333-158920
Dated January 10, 2011
Commonwealth Edison Company
$600,000,000 FIRST MORTGAGE 1.625% BONDS, SERIES 110, DUE 2014
FINAL TERMS AND CONDITIONS
| Issuer: | Commonwealth Edison Company | |
| Ratings: | Baa1 (Stable) (Moody’s) A- (Stable) (S&P) BBB+ (Stable) (Fitch) | |
| Principal Amount: | $600,000,000 | |
| Title of Securities: | First Mortgage 1.625% Bonds, Series 110, due 2014 | |
| Legal Format: | SEC-Registered (Registration No. 333-158920) | |
| Trade Date: | January 10, 2011 | |
| Settlement Date: | January 18, 2011 | |
| Maturity Date: | January 15, 2014 | |
| Issue Price: | 99.855% of principal amount, plus accrued interest, if any, from January 18, 2011 | |
| Coupon: | 1.625% | |
| Benchmark Treasury: | 0.75% due December 15, 2013 | |
| Spread to Benchmark: | 70 basis points (0.70%) | |
| Treasury Yield: | 0.975% | |
| Reoffer Yield: | 1.675% | |
| Interest Payment Dates: | Semi-annually on January 15 and July 15, commencing on July 15, 2011 | |
| Redemption Provisions: | ||
| Make-whole call: | At any time at a discount rate of Treasury rate plus 10 basis points, plus accrued and unpaid interest to the redemption date | |
| CUSIP: | 202795 HW3 | |
| Underwriters: | Credit Suisse Securities (USA) LLC J.P. Morgan Securities LLC Morgan Stanley & Co. Incorporated | |
Loop Capital Markets LLC Mizuho Securities USA Inc. Scotia Capital (USA) Inc. | ||
| RBC Capital Markets, LLC | ||
The issuer has filed a registration statement (including a prospectus) with the U.S. Securities and Exchange Commission (SEC) for this offering. Before you invest, you should read the prospectus for this offering in
that registration statement, and other documents the issuer has filed with the SEC for more complete information about the issuer and this offering. You may get these documents for free by searching the SEC online database (EDGAR®) atwww.sec.gov. Alternatively, you may obtain a copy of the prospectus from Credit Suisse Securities (USA) LLC by calling 1-800-221-1037, J.P. Morgan Securities LLC by calling(212) 834-4533, or Morgan Stanley & Co. Incorporated by calling 1-866-718-1649.
