In the event of a power crisis, power boosters can help rooms and facilities close to them remain powered. While they increase the amount of power that a player can store they also regularly (every 30 seconds) drain a small amount (25) of Energy to remain functioning.
Power boosters increase your energy rating by 20000.
Power Booster has one gaming function of providing light to a segment. With enough energy, and even green light level, a segment can still be quite dark until you put up a power booster. Much better than a Corridor Lamp.