Interesting concept, I was really excited by the screenshots to see how this would play!
Unfortunately I didn't really get what I was doing.. I knew I had to research something so I built a ton of research labs and slapped solar panels everywhere. This worked fine and since the game said to beware of coal I figured screw it I'll not use it at all.
At about 50% solar efficiency I guess I won the game some how? I thought I was trying to hit 100% solar efficiency but apparently not?
The game seems really cool, but I would recommend making a clearer end goal, and adding more limitations to the player, such as a cost to build and a currency generator (perhaps factories that draw a lot of power necessitating the use of coal?).
The conveyor belts were cool, had a very Factorio feel to it which I loved. I suspect this is what you were going for? :)
I would love to see this further developed in the future though, I love these kinds of building/resource games!