The Power Plant produces energy. It is always the second building that can be built, because it only depends on the Construction Yard.
Attacking an opponent's power plants can be a good way to make them enter the low power state.
A spy can infiltrate a power plant, forcing the low power state for a short period of time. This shuts down some enemy defenses and opens a short attack window.
Prerequisites[]
The power plant (or advanced power plant) is a prerequisite for the following: