Exhibit (99.1)

[USEC Letterhead]

FOR IMMEDIATE RELEASE:                  CONTACT:
June 21, 2000                           Charles Yulish:    (301)564-3391
                                        Elizabeth Stuckle:  301-564-3399

         USEC Plant Closure Lowers Costs, Improves Capacity Utilization
                      - Board's Action Saves $55 Million -
         - Guidance Reflects Continued Difficult Operating Environment -

Bethesda, MD - The announcement today by USEC Inc. (NYSE: USU) that it will
cease uranium enrichment at its Portsmouth production plant in June 2001 is an
important step in the Company's ongoing efforts to align its cost of production
with lower market prices.

          The financial effect of the decision by USEC's Board of Directors will
be a reduction in fixed production costs of approximately $55 million in fiscal
2002 as uranium enrichment at Portsmouth ceases. Production will continue at
both plants until June 2001, when it is expected that the Paducah plant will
have been upgraded, certified and tested to produce finished customer product.
Electricity, the Company's largest production cost, is expected to increase
primarily because the previous monetization of excess power at Portsmouth will
no longer be available. Depending on levels of SWU production, these higher
power costs will partially offset the improvement in fixed costs. The Company is
in negotiations for a new long-term power contract for the Paducah plant.

          After the Portsmouth facility ceases enrichment operations, the
Company's capacity utilization will rise from the 25 percent expected in the
coming year to about 50 percent of the Paducah plant's capacity in fiscal 2002.
Actual capacity utilization will depend upon customer requirements.

          Ceasing operations at the Portsmouth plant will result in special
charges of $125 million in fiscal 2000. The pre-tax charges include $75 million
in asset write-offs of production equipment, leasehold improvements and other
fixed assets. The charges also include severance benefits based on current labor
contract requirements, unamortized lease turnover and other exit costs.

          The Company's financial outlook for fiscal years 2001 and 2002
continues to be adversely affected by market conditions for the sale of enriched
uranium. As previously reported, global overcapacity for enrichment, aggressive
competitor pricing, unfavorable currency exchange rates and liquidation of
customer SWU inventories are among the factors holding down the price for the

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Company's enrichment services. USEC's financial projections continue to reflect
a downward trend in average SWU sale prices as historically higher-priced
contracts are displaced with new agreements reflecting today's lower prices.

          For fiscal 2001, the Company anticipates net income in the range of
$30 to $35 million reflecting lower anticipated revenue and the end of power
monetization at Portsmouth. The lower revenue forecast includes fewer spot SWU
sales, resulting in anticipated sales volume of 10.5 million SWU, or about 1
million SWU less than previously projected. Natural uranium sales are also
expected to be lower than previously projected due to the continued decline in
uranium market prices. Looking forward, the Company anticipates net income in
fiscal 2002 to be between $45 and $50 million. The fiscal 2002 outlook depends
upon the timely completion of the assay upgrade project at Paducah, including
approval by the Nuclear Regulatory Commission, an agreement for market-based
pricing under the Russian HEU contract beginning in calendar 2002, and
negotiation of a new, long-term power contract for the Paducah plant.

          "Faced with a changed pricing paradigm for uranium enrichment
services, USEC has aggressively taken steps to lower its production costs," said
William H. Timbers, president and chief executive officer of USEC. "Given the
global overcapacity for enrichment and the volume of HEU available from
dismantled nuclear weapons, reducing USEC's production capacity is a difficult
but necessary action."

          This news release includes certain 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 the Company. Actual results and trends may differ
materially depending upon a variety of factors, including, without limitation,
market demand for the Company's services, pricing trends in the uranium and the
enrichment markets, deliveries and costs under the Russian contract, the
availability and cost of electric power, the Company's ability to successfully
execute its internal performance plans, the refueling cycles of the Company's
customers, and the impact of any government regulation. Additional information
regarding the foregoing factors is contained in the Company's filings with the
Securities and Exchange Commission.

          USEC Inc. is the world's leading supplier of enriched uranium fuel for
commercial nuclear power plants. A global energy company, USEC has it
headquarters in Bethesda, Md.

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