In its alternative energy facilities regulation, Worcester County defines solar energy systems, in part, based on energy capacity. It defines large solar energy systems as those with a rated capacity of two hundred kilowatts or greater. Medium solar energy systems are ground-mounted systems with a rated capacity greater than five kilowatts but less than two hundred kilowatts or roof-mounted systems of any capacity in excess of five kilowatts. Finally, small solar energy systems have a rated capacity of five kilowatts or less.