[1] Unicom's primary subsidiary, Commonwealth Edison, focused on the production, purchase, transmission, distribution, and sale of electricity to residential, commercial, industrial, and wholesale customers.
[4] O'Connor stepped down as CEO in 1998 due to under-performance and was replaced by John W. Rowe who assumed the position of CEO, chairman and president of the company.
[5] In September 1999, Unicom announced a planned $16 billion merger with PECO Energy Company.
[6] The merger was completed on October 23, 2000 and formed Exelon Corporation.
After the merger, Exelon maintained the largest collection of nuclear plants in the United States and became among the nation's largest electric utilities company, generating more than $12 billion in annual revenues.