The power plant is the structure that provides power to the base. Once placed, the power plant provides a gradual increase to the power counter for a base.
As the power plant is levelled up, that output is increased. The power output is also increased when a power plant is placed next to a crystal spawn on the map. Also, if the power plant is next to an Accumulator, it can provide resource bonuses to the player over a period of time.
Both Nod and GDI power plant are nearly identical in appearance to their Tiberium Wars counterparts.