and beam the energy to Earth using microwaves

Let's hope that these beams stay on target.

I noticed that the link for the microwave beam went to a story about the pentagon so I'll add that a space based microwave beam would be one heck of a weapon too.

Hmmmm, good news and at the same time potentially very bad news.

Almost any form of energy can be used as a weapon of sorts.
Not all of them are lethal, either. Here's a new one that's not.

While space may seem like a good place for high output solar, it too has its negatives. Space is the most dangerous place you can deploy anything. Radiation, objects floating in space and even missile attacks are not unlikley. China recently 'shot down' one of its own sattelites in space with a ground launched missile. Kmcolo also mentioned the outcome if the microwave beam was 'off target' . Ooops. Better get Sun Block 2 million, you'll need it.

Here's a potential power you may want to check out: Hydrogen gas from Aluminum and Gallium