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.”
He made this statement in an article for the New York American, November 1, 1933. Two years earlier he had announced in another article (July 10, 1931), "I have harnessed the cosmic rays and caused them to operate a motive device." He went on to write, "More than 25 years ago I began my efforts to harness the cosmic rays and I can now state that I have succeeded."
http://www.free-energy.cc/lindemann-1.html
"...Radiant Energy. Nikola Tesla's Magnifying Transmitter, T. Henry Moray's Radiant Energy Device, Edwin Gray's EMA Motor, and Paul Baumann's Testatika Machine all run on Radiant Energy. This natural energy form can be gathered directly from the environment (mistakenly called "static" electricity) or extracted from ordinary electricity by the method called "fractionation." Radiant Energy can perform the same wonders as ordinary electricity, at less than 1% of the cost. It does not behave exactly like electricity, however, which has contributed to the scientific community's misunderstanding of it. The Methernitha Community in Switzerland currently has 5 or 6 working models of fuelless, self-running devices that tap this energy..."
from: http://www.free-energy.cc/index.html "... Edwin Gray, Sr. produced what he called "Cold Electricity". "...Nikola Tesla discovered the same effect, back in 1889, and named it "Radiant Energy...."
from: http://777001.com/files/Lindemann/(ebook)%20Free%20Energy%20Secrets%20with%20Tesla%20patents.pdf "...An exhaustive comparison between Gray's "cold electricity" systems and Tesla's "radiant energy" systems leads to the reasonable conclusion that these two discoveries are one and the same. Finally, in this light, Gray's circuit schematics are "corrected" and all of the omissions are filled in..."