US Navy wirelessly beams 1.6 kW of power a kilometer using microwaves
1km through the atmosphere is probably all you need to verify that the approach would work for Space Based Solar. I know the military is interested in that. Imagine being able to deploy energy anywhere on Earth and not have to setup a logistics chain to facilitate it. That's priceless. The economics for SBS don't really make sense to me, for domestic energy consumption. But economics are irrelevant if it enables you to project power deeper into hostile territory.