Using high frequency RF energy, the HAARP project is able to modify the conductivity of areas of the ionosphere to lower frequencies (and even DC)... if you did this in a manner to cause the conductive area to shift back and forth, you could turn the entire ionosphere into a MASER.
This was Tesla's grand plan. To harness almost unlimited power from the solar wind, and turn it into usable electricity that could be received by anyone, anywhere, for free.
It wasn't a replacement for power lines... it was way, way better than that!
