Opponents of a state law that lets utilities charge customers in advance for construction of new nuclear plants plan to rally for repeal of the measure at Duke Energy's headquarters in downtown St. Petersburg at 10:30 a.m. Saturday.

The campaign, Rally for Florida Ratepayer Refund, has sparked interest from almost 100 supporters on Facebook. They say they will attend because they oppose Duke's use of the law for $1.5 billion in spending for the Levy County nuclear plant project it canceled last month.

Rep. Dwight Dudley, D-St. Petersburg, who was elected last year largely campaigning to repeal the law, will join with Greenpeace for Saturday's protest.

During the last legislative session, state lawmakers tweaked the advance fee in response to coverage in the Tampa Bay Times. The newspaper has reported how the law was costing Duke customers hundreds of millions of dollars even though it was unlikely the Levy nuclear plant would ever get built. But legislators stopped short of repealing it.

Rep. Michelle Rehwinkel-Vasilinda has filed a bill for the 2014 session for another attempt to repeal the law.