Interplanetary Main Buses

[Apepz]

Hey y'all, Apepz here

I landed on Vulcanus recently and managed to setup up basic sulfide and calcite production but I have come to realize that I need to, at some point, create a main bus. My question is what I should put on the bus, assuming I even need one. And if I dent need a bus, what system should I use instead?

[J-H]

I think all I had was iron, copper, steel, and maybe a bit of carbide.
I used coal, but it never made it to the main bus.