A permit has been approved that would allow construction in Dakota County of one of the largest solar arrays of its kind in the nation. Located in Rosemount near the Inver Grove border, the massive 45-megawatt solar array on 300 acres would be built by Flint Hills Resources to help power its Pine Bend Refinery. Flint Hills will make a final decision on the 45-megawatt project in the coming weeks. For solar farms where power is generated and consumed on the same site, this would be largest project of its kind in Minnesota. The company’s aim is to lower energy costs to keep competitive with refineries in communities where electricity rates are lower. The Pine Bend refinery, with a capacity of 375,000 barrels per day, supplies most of the transportation fuels used in Minnesota. It employs more than 1,000 full-time workers at its facilities in Rosemount and Inver Grove Heights.