See the enclosed attachment about the geomagnetic field.

Having followed the Steve Mark threads for some time I am further convinced that free energy comes from the Earth system and not some mysterious ether or ZPE.  Steve himself is rather vague about the source of the energy that his device taps into having first said it came from the Earth's magnetic field but later in a video recently made available he denies that the energy source is from the environment and talks about standard theory regarding spinning electrons.  In my opinion the source of energy he taps could either be an obscure phenomenon already known to science which no one has thought of using before or it could be something completely unknown.  A study of space physcs reveals vast energy resources in the ionosphere whose potential is not yet known.  I am not just talking about the so called 'ring current' but also a variety of radio and magnetic waves, UV photons and cosmic rays.  Could any one of these have been the ubiqutous energy source that Tesla tapped into?  Whatever it is, the Mark device reveals that devices that tap this energy source have a far greater power density than any kind of renewable energy technology now available and the cost per killowatt hour is a small fraction of that of electricity generated from fossil fuels. No wonder governments have tried to keep this under wraps for so long.

This material I have enclosed may be irrelevant but every avenue should be explored. 

In my opinion most of the energy that the Earth receives from the Sun is in the form of magnetism since that is all that photons or quanta really are according to Bibhas De, and this magnetic energy is the same thing as the 'dark energy' that is said to form two thirds of the Universe according to astronomers.  I believe that static solar photons are trapped in the ionosphere where they exist as spinning magnetic torii and where they create EM waves by interacting with the atmosphere.  I cannot support any of this except with a press report from the Chinese space agency concerning one of their missions which has mysteriously dissapeared from the internet.

See the enclosed attachment from an article in Electronics World titled Aetherflux Ether Tunnel

Clive Stevens is one of several electrical engineers who are developing ideas about space physics that could have relevance for technological developements in ambient energy extraction.  The essence of their approach is that the stars do not convert gravitational energy into thermonuclear reactions but rather receive an external source of energy.  This space energy may be highly diffuse but it occupies a lot of space so there is a lot of it.