Slowly Up

In a forest hut twenty kilometers away from the village lives a fascinating old man. He has rejected civilization, but has the knowledge to benefit humanity. He easily lives without all benefits of civilization. He creates by himself: his house is his dugout, his light is the fire in his stove and his strong nature is his electricity!
This old man is Diogenes, Munchausen and Tesla in one. Philosopher and inventor or just a madman?