MPE Bank of America Corp. Market Index Target Term Securities (Mitts) Linked TO The S&P 500 Index

Mpower Communications Acquires Las Vegas Fiber Network LAS VEGAS, June 9 /PRNewswire-FirstCall/ -- Mpower Holding Corporation (AMEX:MPE), a leading provider of data and voice services to retail and wholesale business customers, today announced that its operating subsidiary Mpower Communications Corp. is expanding its facilities-based network with the acquisition of a metro fiber network in Las Vegas from IDACOMM, the communications subsidiary of IDACORP (NYSE:IDA). The 141-route mile fiber network will have three fully survivable rings, which will connect Mpower's switch and the majority of its collocation facilities in Las Vegas with a fully-redundant core network architecture. The network is slated for completion in the first quarter of 2006. In conjunction with the broadband fixed wireless network Mpower recently announced it is deploying across Las Vegas in the third quarter of this year, Mpower will now have comprehensive end-to-end network connectivity including dedicated backbone transport and direct last mile connections to its customers in this market. "This Las Vegas fiber backbone complements our California fiber network and will give us substantial fiber assets in our largest markets," stated Mpower Communications Chairman and Chief Executive Officer Rolla P. Huff. "With this network in place, we expect lower transport costs, enhanced network quality, speed-to-market with new products, shorter provisioning intervals and extended reach. We also gain greater flexibility and more control over the connections to our customers without relying on the ILEC. Importantly, we are able to acquire this fiber network within our existing capital expenditure guidance." In addition to supporting Mpower's full range of IP-based and traditional voice and data products and services, the fiber network will open up new business opportunities for Mpower as it will pass through key business centers of concentration in the city and create wholesale opportunities for Mpower's private line offering. Mpower has been serving the telecommunications needs of the Las Vegas market since 1996 and currently employs more than 300 people in that market. About Mpower Mpower Communications Corp., the wholly-owned operating subsidiary of Mpower Holding Corporation (AMEX:MPE), is a leading facilities-based broadband communications provider offering a full range of data, telephony, Voice over IP and Web hosting services for small and medium-size business customers. Further information about the company can be found at http://www.mpowercom.com/ . About IDACOMM IDACOMM is the communications subsidiary of IDACORP (NYSE:IDA), a $2.8 billion family of companies including the award-winning utility Idaho Power. IDACOMM shares a heritage of technical expertise, customer service, and financial stability uncommon in the current telecom landscape. IDACOMM possesses more than 25 years of fiber optic networking expertise. Further information about the company can be found at http://www.idacomm.com/ . Forward-Looking Statements Under the safe harbor provisions of the Private Securities Litigation Reform Act of 1995, Mpower cautions investors that certain statements contained in this press release that state our and/or management's intentions, hopes, beliefs, expectations or predictions of the future are forward-looking statements. Management wishes to caution the reader that these forward-looking statements are not historical facts and are only estimates or predictions. Actual results, including projections with respect to Mpower's future operating performance and the benefits to be generated by the fiber network in Las Vegas may differ materially from those projected as a result of risks and uncertainties including, but not limited to, our ability to effectively integrate the fiber network into our operations, unexpected costs of integrating the fiber network into our operations, future sales growth, changes in federal or state telecommunications regulations, market acceptance of our product and service offerings, the liquidity of our common stock, our ability to secure adequate financing or equity capital to fund our operations and network expansion, our ability to manage growth and maintain a high level of customer service, the performance of our network and equipment, our ability to enter into strategic alliances or transactions, the cooperation of incumbent local exchange carriers in provisioning lines and interconnecting our equipment, regulatory approval processes, the effect of regulatory decisions on our access charges and operating costs, changes in technology, price competition, and other market conditions and risks detailed from time to time in our filings with the Securities and Exchange Commission. We undertake no obligation to update publicly any forward-looking statements, whether as a result of future events, new information, or otherwise. DATASOURCE: Mpower Holding Corporation CONTACT: Investors: Gregg Clevenger, Chief Financial Officer, +1-585-218-6547, , or Media: Michele Sadwick, Vice President, +1-585-218-6542, , both of Mpower Communications; Cameron Christian, VP Marketing, IDACOMM, +1-208-514-3306, Web site: http://www.mpowercom.com/ http://www.idacomm.com/

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