gray
Edwin V. Gray, Sr
http://www.free-energy.cc/gray.html
In 1958, Edwin V. Gray, Sr. discovered that the discharge of a high voltage capacitor could be shocked into releasing a huge, radiant, electrostatic burst. This energy spike was produced by his circuitry and captured in a special device Mr. Gray called his "conversion element switching tube." The non-shocking, cold form of energy that came out of this "conversion tube" powered all of his demonstrations, appliances, and motors, as well as recharged his batteries. Mr. Gray referred to this process as "splitting the positive." During the 1970's, based on this discovery, Mr.
Radiant energy
http://en.wikipedia.org/wiki/Radiant_energy
"...Radiant energy is energy that is transported by waves. This includes energy transception in the form of waves through space or various media. Radiant energy is also energy transfered through electromagnetic waves. Solar Energy is a type of radiant energy. Radiant energy may be calculated by integrating radiant power with respect to time. Radiant energy is usually expressed in joules...."
http://www.whatmatters.nu/ferw.html
Nikola Tesla worked out of the conviction that, in his own words, the “new power for the driving of the world's machinery will be derived from the energy that operates the universe, the cosmic energy, whose central source for the earth is the sun and which is everywhere present in unlimited quantities.”