I'm a bit concerned at the idea of beaming high power microwaves at the ground from something that's free floating. If this is done can we please at least have the ground stations on former offshore oil and gas rigs far from land. Then people will have less chance of being randomly microwaved from space if something goes wrong. or perhaps a laser on the ground that acts as a 'passcode' to enable the space microwave, and no power is sent if the space laser misses the ground station.

Come to think of it, you could produce hydrogen gas from the microwave power combined with the seawater, then put the hydrogen down the former gas pipelines back to shore. And gas can be sent by ship as well, unlike electricity.