Currently power stations offer no increased efficiency for higher levels. The way to get higher efficiency is to surround key building like fuel site and converters with as many low level power stations as possible. The result of this is most lands end up having a very large number of power stations built. It can sometimes be as much as 50% of all the buildings. This causes lands to look cluttered and not appealing to look at, as well as incentivizes the strategy of nexus rushing to increase the building limit as fast as possible, and there is no need to level power stations up past level 1. This seems like a very suboptimal situation.
After many discussions on discord channels with other players about this issue, my suggestion is to simply add a mechanic where increasing power levels yields an increase in efficiency boost. This would require that level 1 stations get a major nerf in the amount of efficiency they yield, and this would then be recovered as it levels up. I believe the ideal state is that one max level power station right next to a building should yield the full 150% bonus, thereby removing the need for 5+ power stations crowded in an area. This should then be accompanied by a decrease in the max number of buildings allowed, so that players are actually forced to make strategic decisions about where they want their efficiency to be placed, and the reduction in necessary power stations does not just lead to more converters.
The aesthetics of our land should be very important. The current meta balance pushes players to have tightly packed, crammed lands where the vast majority of buildings are power stations and converters. Those buildings should be special buildings on our plots, not a dime a dozen. I'm including a few screenshots of plots that people shared on discord representing the current state of the meta in Illuvium zero. This change will have the benefit of leaving more available space on our land for the future.