BETHESDA, Md. – USEC Inc. (NYSE: USU) has signed a $200 million contract with Constellation Generation Group, the wholly owned subsidiary of Constellation Energy Group, to supply separative work units (SWU) to fuel the utility’s five nuclear power reactors. SWU is the standard unit of measurement for uranium enrichment.

Under the contract, USEC will continue to supply the Baltimore-based utility with fuel from recycled Russian warhead uranium through the U.S.-Russian Megatons to Megawatts program. Recycling of the warhead material takes place in Russia before shipment to the United States. As the U.S. government’s executive agent, USEC purchases the warhead-derived fuel from Russia for use by utility customers. For more information on the program, visit www.megatonstomegawatts.com.

Robert Van Namen, USEC senior vice president, said, “This new contract extends USEC’s strong partnership with Constellation and underscores our commitments to nuclear power and global security. It also supports USEC’s program to demonstrate and deploy its next-generation American Centrifuge uranium enrichment technology and provide a reliable and competitive fuel source for many years to come.”

USEC has been a fuel supplier to Constellation for more than a decade. The new contract will cover deliveries from 2007 to 2012.

This news release contains forward-looking information (within the meaning of the Private Securities Litigation Reform Act of 1995) that involves risks and uncertainty, including certain assumptions regarding the future performance of USEC and market pricing trends. Actual results and trends may differ materially depending upon a variety of factors, which are described in USEC’s periodic filings with the Securities and Exchange Commission. These SEC filings are available on USEC’s website www.usec.com.

USEC Inc., a global energy company, is the world’s leading supplier of enriched uranium fuel for commercial nuclear power plants.

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