To make a difference to our use of the national power grid, we need to store the energy generated through the wind and sun until we need it. 
Large-scale 
One of the solutions is to install large-scale batteries. Around the UK there’s currently capacity for around 500MW of large-scale battery power. That’s expected to double within three years. Globally, 50GW of storage is expected to be installed by 2020, and almost 1,000GW by 2040. That would be about 7% of the world’s energy capacity. 
 
In the UK 
In the UK, battery installations are mainly supplying services to the National Grid, helping to match supply and demand as more wind and solar power becomes available. 
 
In hybrid solar and wind farms, batteries are being installed alongside. This approach supports their financial viability by allowing power to be stored during the day to sell for better prices when demand is higher. 
 
At home 
Tesla’s Power Wall made the idea of larger-scale storage for the home a popular concept. About the size of a large domestic radiator, these cells can store and release electricity generated from the sun and wind at home or imported from the grid. 
 
Currently, they are popular with homeowners who have solar panels or who live in areas with extreme conditions, looking for clean, reliable backup power. 
 
The future 
Energy storage is a growing trend. RenewableUK has recently launched a database of battery storage that shows how planning applications for battery storage have increased from just 2MW in 2012 to 6,874MW in 2018. There are now almost 400 energy storage projects around the country. 
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