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Uh, Nikola Tesle invented this nearly a century ago. Except that he discovered that he could power the entire planet wirelessly with only a few resonance towers, at 90% efficiency. The electricity industry turned him down and burried his discovery because they would not be able to meter and charge people for it the way they wanted to. Thank you American greed. Now MIT digs it up, dumbs it down, and calls it their own. Don't get me wrong, I hope it finally takes off, even if it isn't even close to the magnitide of Tesle's creation. But give credit where credit is due.
Yep, Tesla was ignored and it had everything to do with not being able to profit from the global consumption of electricity. Tesla proved that it was not harmful because you weren't "producing" electricity and sending it through the atmosphere - the way that MRI's or phones or any number of other devices produce and send electromagnetic waves. Tesla's towers (and even smaller devices that he created) simply harnessed the already existing energy that was present in the ionosphere. So people worried about cancer need not be concerned...although, whether or not MIT's method is the same as this remains to be seen.
There was no finite limit to this energy and it was totally and completely FREE! Call me pessimistic, but corporations and governments will never let this happen.