this post was submitted on 16 Oct 2025
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It's not free energy, but there's at least one bike called the Pi-Pop that works this way in order to spread the energy demand from hills across more distance for the rider. It's an electric bike you can't plug in, it only charges from moving
There is one particular mine, I forget where, and they extract ore at the top of the hill and carry it down in electric trucks that gather more energy on the downhill run than they need to get back to the top when empty, so they never need to be charged.
That's awesome, reminds me of a common historic setup where cable cars were used kinda like that (heavier on the way down)
I found an article talking about it- apparently it's just one experimental truck in Switzerland that actually generates 10kWh per trip.