As used in this chapter, the following terms shall have the meanings indicated:
Any mechanism designed for the purpose of converting wind energy into electrical energy.
A WECS that is the prime use on a parcel of land and supplies electrical power for off-site use.
A WECS that is incidental and subordinate to another use on the same parcel and supplies electrical power solely for the on-site use, except that when a parcel on which noncommercial WECS is installed also receives electrical power supplied by a utility company, excess electrical power generated by the noncommercial WECS and not presently needed for on-site use may be used by the utility company to the parcel for on-site use, as long as no net revenue is produced by such excess electrical power.