Home batteries are no longer just useful for storing solar power at home. With smart software and virtual power plants, they can also help support the wider electricity grid. This makes them more valuable for households and for the energy system as a whole.
What is a virtual power plant?
A Virtual Power Plant (VPP) is an online network of thousands of small energy sources and flexible devices that work together as one large, flexible power plant. These can include solar panels, home batteries, charging stations and heat pumps.
A VPP helps balance the electricity grid by coordinating these connected devices. When there is a lot of solar or wind energy available, it can increase electricity use by charging batteries, activating charging stations or running other flexible systems. When there is a shortage of electricity, stored energy from batteries can be used or supplied back to the grid. The VPP operator can also buy or sell energy at favourable moments. For households, this can be attractive because connected devices, such as a home battery, can help support the grid and may generate compensation in return.
How home batteries become part of a virtual power plant
Home batteries play an important role in a Virtual Power Plant because they can store electricity and release it when needed. When there is a lot of renewable energy available, the battery can charge at a useful moment. When demand is high or the grid needs extra support, the stored electricity can be used in the home or supplied back to the grid.
This makes home batteries valuable not only for lowering household energy costs, but also for providing flexibility to the wider energy system. With smart software, many home batteries can be coordinated at the same time, turning individual household systems into a useful source of grid support.
Why flexibility is valuable for the electricity grid
In the past, large coal and gas power stations produced most of the electricity we used. They could adjust their production based on expected demand. With more wind and solar energy, electricity supply has become much less predictable because it depends heavily on the weather.
This is why flexibility is becoming so important. A flexible grid can store more electricity when the sun is shining or the wind is strong, and use less electricity from the grid when renewable energy is not available. Instead of only producing more power, the system also needs to become better at using and storing electricity at the right moments.
Today, millions of solar panels can produce electricity at the same time on sunny days. This can put pressure on the electricity grid and cause congestion. With a more flexible system, some of this energy can be stored locally, for example in home batteries. This helps prevent the grid from becoming overloaded and makes better use of renewable energy that is already being produced.
This can be much more efficient than only modernising the existing electricity grid. The International Energy Agency (IEA) estimates that renewing electricity grids in many countries could take more than a decade and cost hundreds of billions of euros. It also estimates that Europe will need to double its current grid capacity to reach its climate goals in a cost-effective way. VPPs and home batteries will not replace grid upgrades completely, but they can help make the current system work smarter.
What this means for the future of home batteries
Virtual power plants show how home batteries can become more than simple storage devices. By working together, they can help balance the grid, make better use of renewable energy and create extra value for households. As the energy system becomes more flexible, home batteries could play a much bigger role in keeping electricity reliable and affordable.
