Marketing And Operations VP

EXHIBIT 10.4 CONFIDENTIAL TREATMENT HAS BEEN REQUESTED FOR THE REDACTED PORTIONS. THE CONFIDENTIAL
REDACTED PORTIONS HAVE BEEN FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.
ASTERISKS DENOTE SUCH REDACTIONS. March 2, 2006 TV-05356W, Supp. No. 2 Mr. Robert Van Namen
Marketing and Operations VP
United States Enrichment Corporation
Two Democracy Center, Tenth Floor
6903 Rockledge Drive
Bethesda, MD 20817-1818Dear Mr. Van Namen:In accordance with the provisions of Power Contract TV-05356W, as amended (Power Contract), TVA has determined that United States Enrichment Corporation (Company) presently has a CRR equal to a Below Investment Grade Rating . Accordingly, this letter is to confirm the arrangements agreed upon between representatives of TVA and Company, regarding Company' s Performance Assurance to be provided and maintained by Company:It is understood and agreed that until such time, if any, that Company' s CRR and corresponding Collateral Threshold is such that no Performance Assurance is due from Company under the Power Contract, and in accordance with Article IV of the Power Contract, the parties have agreed that the provisions below shall be applicable to provide for the Performance Assurance to be provided and maintained by Company. 1. Letter of Credit . Company shall provide TVA an Irrevocable Letter of Credit, in a form acceptable to TVA, in the amount of $***** not later than March 15, 2006. Company shall at all times keep such Letter of Credit in full force and effect. The Letter of Credit may be utilized by TVA to cover any obligations arising after June 1, 2006, for which the Power Contract provides and for which payments are not made by Company, including, but not limited to, minimum bill obligations. Notwithstanding hereunder, Company will remain obligated to make all ...