USEC, Toshiba, and Babcock & Wilcox Extend Standstill Agreement

USEC Inc. (NYSE: USU) announced today that it has entered into an
amendment to its standstill agreement with Toshiba America Nuclear
Energy Corporation (Toshiba), and Babcock & Wilcox Investment Company
(B&W) to extend the agreement through September 30, 2011.

The amended agreement provides a limited additional period of time for
USEC to finalize and enter into a conditional commitment with the U.S.
Department of Energy for a $2 billion loan guarantee to support the
construction of the American Centrifuge Plant and achieve the closing of
the second phase of Toshiba and B&W′s investment in USEC.

Additional details are provided in a Form 8-K that USEC has filed with
the Securities and Exchange Commission, which is available at http://phx.corporate-ir.net/phoenix.zhtml?c=93662&p=irol-sec.

USEC Inc., a global energy company, is a leading supplier of enriched
uranium fuel and nuclear industry related services for commercial
nuclear power plants.

USEC Inc.

Media:

Paul Jacobson, 301-564-3399

or

Investors:

Steven
Wingfield, 301-564-3354