Construction would be left to construction robots who wold be shipped to the Moon along with the supplies needed to construct the array. Once installed, the Sun-facing cells would collect energy and store it until they were facing the Earth once more. Then laser and microwave transmitters would fire up, beaming power to their partner stations around the globe.
The microwave antennas on the Moon would be 12 miles in diameter augmented with high density laser transmitter
Shimizu Corp's Plan
DVice article on the solar project