I am wondering just how far down the spire reaches. Such a huge construction likely needs a lot of reinforcement in it foundations. The spire is an archology, a common version is an underground environment.
I have found nine names of spires so far, but who knows how many more there are. From a a description from folly, the ether lines are influenced by the spires as they act as sinks drawing energy to feed the spires systems, but what else do the spires use this power from. If you think about it, spires are a form of pseudo crystal which channels the power.
Only ships have power cores, I wonder if something could've set up so that spires act as power cores allowing devices powered but them can be shared amongsth the common population. Electricity for all.