Earth as a Stellar transformer...
-- Climate Change Revealed 43 Minutes
Tesla first discovered how to produce 3 phase electrical energy, we suspect he very likely figured this out from his observations of the Earth's electrical behavior. In his bravado to J.P. Morgan, he bragged he could supply free energy to the whole planet. Of course as history records, upon hearing of this, J.P. Morgan immediately canceled all contracts with Tesla and began a venture with Edison to make money.