Just been reading about the exciting news coming out of Brazil:
Inventors Nilson Barbosa and Cleriston Leal, of "Evolutions in Energy" (Evolucoes Energia) in Imperatriz - MA, Brazil, are claiming to have a commercially available, self-powered system for electricity generation.
They call it the "Earth-electron captor" or the "free-space electron captor" electrical generator, depending on how it is configured. Apparently, it is a system with no moving parts, no noise, which can be self-looped and mobile.
On their home page, they say that they have a unit commercially available that produces 39.6 kW at 220V while consuming just 440 W from the grid. That's enough to hand the peak load of two typical US homes. The pricing is not listed on their site.