I chased the free energy for some time.
What I demand of a free energy device is the following:
1) It must be replicated. Having a device that only works in the inventors shop points to a scam.
2) It must be working in a home near me. This wiz bang if it works and is replicated must have some real benefit for my life so if it is producing energy from nothing then someone had better be powering their home with it and they have unhooked from the electric grid.
The devices that approach free energy devices are solar panels, wind generators, and Nuclear energy. They product energy without my input of power. Other devices that could generate energy theoretically could exist, and few do exist but the cost to make them as in keeping super conductors working is cost prohibitive.