I did originally plan that. Moved to hydrogen fuel from mostly rainwater harvesters

you know there is oil at the bottom of the crater

I have coal, sand, and copper in retaining walls here. I used to keep the piles for backup of pure ore. I moved away from that towards the end of this map, but kept them around because they looked neat

What are those piles of minerals you have piled up inside of Walls? Just curious to see your setup