ROCHESTER, NY– September 20, 2004 -- Mpower Communications Corp. (AMEX:MPE), a leading provider of broadband Internet access and telephone services to business customers, announced today that it will be presenting at the Jefferies 2 nd Annual Communications & Media Conference on Thursday, September 23, 2004 from 4:45 to 5:15 p.m. EST.

Mpower Communications Chairman and Chief Executive Officer Rolla P. Huff will present an overview of the company, its growth strategies and position within the telecommunications industry.

The conference is being held at the NY Palace Hotel, 455 Madison Avenue in New York City.

About Mpower Communications

Mpower Communications (AMEX:MPE) is a facilities-based broadband communications provider established in 1996. Mpower offers a full range of data, telephony, Internet access and Web hosting services for small and medium-size business customers. Further information about the company can be found at www.mpowercom.com.