Dominion Resources' four nuclear power stations are burning uranium fuel once used in Russian nuclear warheads.
Dominion Resources says its North Anna and Surry power stations in Virginia, along with stations in Wisconsin and Connecticut, are using the equivalent of 429 Russian weapons of mass destruction.
Dominion Resources chief nuclear officer David Heacock said the company is pleased it had a significant role in reducing excess stocks of nuclear warheads that were developed during the Cold War.
Dominion Resources has used up all the fuel it bought under the commercially financed program.