20% efficiency instead of 99% wired for such a short distance. 1600 wasted watts of generator power and fuel that needs to be transported to the battlefield at a high energy cost. Only the military would think this is historic.It was a long-range, free-space power beaming system - the first of its kind. Attendees that day, May 23, could see the system itself—the two 13-foot-high towers, one a 2-kilowatt laser transmitter, the other a receiver of specially designed photovoltaics. But the important part, the laser that was beaming 400 watts of power across 325 meters, from the transmitter to the receiver, was invisible to the naked eye.