This was extremely borked:
The priority overrides for refinery, production and silo ignored power completely and never checked whether the structure might drive the AI into low power state; whereas the check for regular building checked whether the structure's power -exceeded- MinimumExcessPower (previously just 0). The catch is that power draw is represented by negative numbers, so the only buildings that would trigger this were - power plants.
Now it checks whether the sum of building power draw (negative) and AI's current power level are lower than MinimumExcessPower, if not, build the structure, if yes, build a power plant instead.
Additionally, this check is now performed for the early-game priority overrides as well.
Last but not least the AI would not(!) give power plants priority if it was already low on power. This has been fixed as well.
To prevent the AI generating lag spikes by issuing too many orders in a single tick, it is now limited in how many orders can be issued per tick. Extra orders are queued. This allows the performance hit of issuing multiple orders to be spread out over several ticks.
