Home battery installations in the UK have seen a significant surge in recent years, as more households seek to reduce their energy costs and improve resilience against power outages. The number of certified domestic battery systems more than doubled to 41,057 last year, and this year installations have increased by an additional 50 percent, bringing the total to 96,054 homes equipped with batteries, according to the Microgeneration Certification Scheme.
This rising trend is part of a broader shift towards sustainable home energy solutions, which also includes solar panels, electric vehicles, and heat pumps. While solar panel owners frequently install batteries to store excess electricity generated during the day, households without solar power are increasingly adopting batteries for their ability to optimize electricity usage and reduce bills.
One of the main drivers behind the growing popularity of home batteries is the dramatic drop in costs. Since 2010, the price of home battery systems has fallen by approximately 90 percent, largely due to a decrease in lithium prices, a key component in battery production. This cost reduction has made battery storage more accessible to a wider range of consumers.
Batteries enable homeowners to save money by storing electricity when prices are low and using it when prices rise. Electricity costs vary throughout the day, often spiking during peak demand due to reliance on more expensive generation methods like nuclear and gas-fired power plants. Conversely, during periods of low demand—often overnight—electricity prices fall as cheaper sources are used.
To take full advantage of these price fluctuations, customers generally need to be on smart or time-of-use tariffs, which offer variable electricity rates depending on the time of day. These tariffs require a smart meter and allow users to charge their batteries during low-cost periods, such as overnight hours when rates can be as low as 7 to 8 pence per kilowatt-hour, and consume the stored energy during peak periods when rates rise to around 26 pence per kilowatt-hour. This shift from traditional single-rate tariffs, which charge a uniform rate regardless of usage time, can result in substantial savings.
In addition to saving money, batteries offer the added benefit of providing backup power during blackouts, helping to maintain essential functions in the home when the grid is down.
The UK government has signaled strong support for these energy efficiency measures. In March, it pledged a £15 billion investment to help households become more energy efficient, including grants and low- to zero-interest loans for home batteries and solar panels. Detailed plans and eligibility criteria are expected to be announced later this year.
Energy suppliers typically assist customers in selecting appropriate tariffs and managing home battery usage, often supplemented by energy-tracking applications that provide real-time consumption and cost data to maximize savings. As battery technology becomes more affordable and integrated with smart energy systems, they are expected to play a growing role in helping households manage energy costs and stabilize the grid.