Every bit of electricity (almost) that you use is generated magnetically.
Generators work by moving a piece of wire through a magnetic field. When this happens, it generates a voltage on the wire. Every AC generator works on this principle, from nuclear to wind.
What all of these systems have in common is that they take some moving medium (air, steam, water, etc) and use it to turn the armature of a generator, which moves either a wire through a magnetic field, or a magnetic field through a wire.
Coal, Natural gas and oil fired generating stations heat water, generating steam, which is then used to turn a turbine which powers the generator. Many nuclear plants rely on the heat from a reactor which heats a primary liquid (radioactive), which then goes to a heat exchanger to generate steam, which powers the turbines.
Hydroelectric power plants rely on the pressure of falling water to turn turbines, and wind power uses the motion of wind to turn the turbines.
All of these are forms of using magnetism to generate electricity.
Solar power is coming down in price, and directly converts light to electricity. In this system, photons of energy interact with the atoms in a substrate and free electrons which then move through the connected wires. This is more of a direct conversion and does not require any magnetism. The trouble with this sort of energy is that it needs to be converted from direct current to alternating current so that it can move along our transmission lines efficiently.
I didn't realize that there was an entire pseudo-science built up around this. Apparently the concept is to somehow harness the magnetic fields of the Earth and Universe to produce useable power. Unfortunately this is simply not possible because at any given point on Earth, that field is simply not dense enough.
Looking at a design of such a system, it's blatantly impossible. The idea that it's hidden because free energy would not be exploited, or it would be hindered because big businesses wouldn't make money is silly. Solar power disproves that. Solar panels are built and used widely. They power boats, road signs, camps and more.
The truth is that if such a device could be built, and if it worked, it certainly would be. It doesn't work because it can't. The idea is simply that a rotating coil will extract energy from a magnetic field, and that the Earth's magnetic field will power the device.
The simple law of physics is that a static magnetic field CANNOT generate power. Either the wire or the field has to be in motion. To produce useable amounts of power, it must be a very strong and dense field. The Earth's magnetic field, in a local area is neither strong nor dense.
Such devices cannot work. Sorry.
I used to design build test equipment to test watthour meters. These meters worked on a principle similar to what is advanced for these devices, involving a rotating mechanism in a magnetic field. I know something about the production and measurement of electricity.