Policy
£28m storage challenge aims at 100 hours: does it change home battery plans?
On 20 August 2026 the government launched the Ultra-Long Duration Energy Storage Challenge. It offers £28 million through UK Research and Innovation to develop technology that can supply clean electricity for 100 hours or more. The press release says that is enough to power homes and businesses for at least four days. It has two focus areas: new battery technologies, and systems that store hydrogen underground.
The reason given is price protection. The release says wind and solar are currently the cheapest ways to generate electricity in the UK, but that when the wind drops or the sun is low, the grid relies on options including gas-fired generation. Storing clean power and releasing it later is meant to reduce reliance on gas and shield consumers from price spikes. It says the hydrogen storage work could reduce total energy system costs by between £14 billion and £50 billion between 2035 and 2050.
Is any of this for households? No. The money goes to innovators bidding for grants, including a competition of up to £3 million for studies into electrochemical storage. Nothing in the release offers a grant, loan or discount for a home battery. It also describes these technologies as not yet commercialised at scale, so there is nothing to buy today.
A home battery works on a much smaller scale. It is measured in kilowatt-hours, and it typically covers an evening, not four days. Its job is to store your own solar or cheap-rate power and use it when it is worth more. That is a different job from the grid-scale storage this challenge is aimed at, and that job does not go away. Our battery-only page explains how it works.
One related detail is closer to home. The release says the launch completes the £102 million Clean Energy challenges, which include a £74 million Consumer-led Flexibility Challenge for technologies that help shift electricity use to when it is cheapest. That is the same idea a home battery already uses. If you want to see how the numbers stack up, start with our costs guide and our solar and battery page.
Read the original: GOV.UK (DESNZ, DBT and UKRI): New challenge launched to store clean energy for longer. Figures come from that page. Where we do our own sums we say so. Commentary is our own view, not advice.
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