For those living in a home with a solar power system, a home battery allows you to store excess solar energy generated during the day, to be used later when the sun isn’t shining. A household with both battery storage and solar power has maximum control of their electricity use. What size solar and battery system is best for my home? Find out more about solar feed-in tariffs here. A Virtual Power Plant (VPP) is a network of connected home batteries that can be coordinated to act like a single large power plant.