UK Home Battery Installations Nearly Double in 2025 Amid Price Spikes and Supply Disruptions

Home battery installations rose sharply in several countries in 2025 as variable electricity tariffs and supply disruptions encouraged households to store power when prices are low. More than 40,000 homes and small businesses in the UK added battery systems with or without solar panels, nearly doubling the record set in 2024, @NewScientist reported.

Octopus Energy said its combined solar and battery installations doubled between February and March after the Iran war began disrupting supplies and remained above pre-war levels after Britain’s energy regulator raised the state price cap.

Installations in the US increased 75 percent during the same period. In Germany one in six homeowners now owns a battery, for a national total exceeding 2 million units. Battery storage has become the world’s fastest-growing power technology, according to the International Energy Agency.

On variable tariffs in Britain, batteries can charge at rates as low as 5 pence per kilowatt-hour in the early afternoon or overnight and discharge during the 4-to-7 pm peak when prices reach 40 pence. During the recent heatwave, peak prices climbed to nearly 50 pence. The average UK household currently pays £9,400 for a battery system.

Octopus Energy plans to introduce a plug-in battery the size of a shoebox that stores 2 kilowatt-hours, enough to run a refrigerator for one to two days, at a cost below £300. The company expects regulatory approval for consumer use in 2027 and projects a lifespan of at least 12 years. Phil Steele of Octopus Energy said customers would recover the cost in two to three years.

Last year the UK paid wind farms £379 million to curtail output when the grid could not absorb surplus renewable generation. Home batteries could store some of that energy and reduce the need for gas-fired plants during peak hours. Producing a lithium-ion battery emits 150 to 200 kilograms of carbon dioxide equivalent per kilowatt-hour of capacity.