Warning: Tangent bordering on fringe science HAARP can, for the price of a megawatt, modulate the conductivity of portions of the ionosphere. That same ionosph

Warning: Tangent bordering on fringe science HAARP can, for the price of a megawatt, modulate the conductivity of portions of the ionosphere. That same ionosphere is in contact with a few gigawatts of direct current in the form of solar flux. It's possible that you could modulate the ionosphere and a few tens of hertz and capture a large portion of the resultant power. I think this is what Tesla meant to do with Wardenclyffe Tower. His definition of unlimited energy actually isn't that much in modern terms. The disruptions it would cause would cause the existing power grid would likely also be far worse than the possible gigawatt of power it could yield. The effects of such harvesting on the ozone layer are also likely to be negative.