TL;DR
Add elevated big power pole in fulgura together with elevated railsWhat?
When you get in fulgora, you can make a train network with elevated rails in the lighter oil patches, but you can't place anything else.Islands are far enough away that 99% of the time you can't reach from one island to the other, even with rare tier big power poles.
On top of that, the island that really have a good amount of resource are very small with no much space for a bunch of accumulators.
Yes, one could use the foundation that is unlocked on the last planet, but at the point you get it, its basically useless as one already have a properly working base to get there anyways.
Begin able to do rails but not power connections is kind of weird. By having big power poles being placeable in light oil patches just like elevated rails can would easily fix it
Why?
Because islands are too far apart to be connected with power, and too small to be self sustain with accumulators.By the time one unlocks foundations, its already useless as one already have a good enough base.