Kentucky's Energy and Environment Cabinet said thousands of gallons of "corn syrup blend" got into the creek after November's explosion.
The privately-owned Silver Crystal Dam was built in 1950 and was rated in "fair" condition during its last state inspection.
The restriction remains in effect through Dec. 15.
Kentucky Gov. Andy Beshear has run into a roadblock in trying to deliver relief for Louisville-area motorists forced to pay more at the pump for reformulated gas.
The ground-mounted solar panel system will help provide electricity for security, lighting, offices and barrel elevators at the rickhouse along state Route 52.
State officials said crews had emptied the tank cars of ethanol and had removed them from the accident site to a nearby constructed pad.
The tank has since been fixed, and no other tank at the station was found to contain water.
The Kentucky Heritage Land Conservation Fund Board said LG&E didn't follow Kentucky's Eminent Domain Act before filing its lawsuit against Bullitt County landowners.