The article doesn't really do Tim justice. He's a bodger who is basically a genius for what I can only describe as Goblin technology. His projects are as much about fun and experimenting as having a result. In the first windmill video he acknowledged that he could just buy a small electric windmill, but that's not the point.
I mean, this is the dude who made a narrow gauge railroad and a compressed air locomotive to transport wood to his terrifying biochar chopper and crucible.