SALT LAKE CITY — Rocky Mountain Power says it will build its first large-scale collection of Utah solar panels.

The utility in a Wednesday statement said it's working on a project designed to gather enough sun-fueled electricity for 500 homes.

The plan would set up 9,000 panels paid for in part by customers choosing to pay extra toward renewable energy efforts.

Rocky Mountain Power President Richard Walje said in a statement the proposed solar project would be the state's most expansive yet.

The utility says it has not yet decided where to put the panels. Before building, it must get approval from the Utah Public Service Commission.

Officials say the planned solar farm would initially generate two megawatt-hours, but could later grow to produce five megawatts.

— Associated Press