Recently, I've been going down the "Free/Infinite energy suppression" rabbit hole. It seems like generating an infinite amount of energy for free is pretty easy, yet this knowledge is being suppressed by governments and corporations. Two of the most well known proponents of free/infinite energy, Stanley Meyer and Eugene Mallove were both apparently murdered, with Stanley being poisoned and Eugene being beaten to death in a supposed house robbery.
Magnetic energy seems to be the easiest. I actually had a similar idea, but I figured that there must be some reason why it can't be done, but it looks like I was wrong.
This generator in particular uses the potential energy from repealing magnets to generate free and unlimited electricity.
Here's a bigger one using only one stationary magnet with a disc of what seems to be more powerful magnets. The video claims that it can generate 220v of free electricity.