UK Government Launches £28 Million Challenge to Accelerate Ultra Long-Duration Energy Storage Development

August 30, 2026

Gov.uk UK

Overview

The UK government has unveiled a new £28 million (approximately $50 million) challenge program to accelerate the development of ultra-long-duration energy storage (ULD EES) technologies. This initiative aims to stabilize renewable energy supply and protect households from energy price volatility. It seeks to foster innovative technologies capable of storing electricity for days to weeks, crucial for the expanding deployment of solar and wind power.

In Depth

Key Findings

The UK government has launched a £28 million (approximately $50 million) ‘Ultra Long-Duration Energy Storage (ULD EES) Challenge’ program to deepen renewable energy integration and shield consumers from future energy price fluctuations. This groundbreaking initiative aims to accelerate the development of innovative technologies capable of storing electricity for several days or even weeks. This is a critical step for stabilizing the power grid as intermittent renewable energy sources, such as solar and wind power, are increasingly integrated.

Technical / Clinical Details

This challenge seeks new forms of long-duration energy storage solutions that can bridge the ‘gap’ not addressed by conventional battery technologies. Eligible technologies include, for example, compressed air energy storage (CAES), liquid air energy storage (LAES), hydrogen storage, gravity-based storage, thermal energy storage, and new generations of flow batteries and solid-state batteries. The program supports technologies in the research, demonstration, and pre-commercialization stages, aiming to shorten their time to market. Specifically, while existing lithium-ion batteries cater to several hours of storage, this challenge focuses on systems with storage capacities exceeding 100 hours. This capability will enable the grid to cover electricity shortfalls during prolonged periods of low wind or cloud cover, known as ‘dunkelflaute’.

Background & Context

The UK is actively pursuing the deployment of renewable energy to achieve its net-zero emissions target by 2050. However, as the proportion of renewable energy increases, the variability of power supply poses a significant challenge to grid stability. Traditional short-duration storage solutions cannot address power shortages that arise during multi-day periods of low wind or overcast skies. Therefore, long-duration storage technologies are essential for ensuring the UK’s energy security and reducing its reliance on imported fossil fuels. This challenge is also a strategic investment to establish the UK as a global leader in long-duration storage technology, fostering new industries and creating jobs.

Strategic Significance & Outlook

This £28 million investment by the UK government will accelerate the commercialization of long-duration energy storage technologies and significantly bolster the transition to clean energy. Successful technologies will dramatically enhance the stability of the UK’s power grid, contributing to more affordable and reliable electricity supply for consumers. Furthermore, technologies developed through this program are expected to be internationally competitive, potentially boosting UK technology exports. Global attention will be focused on the innovative storage solutions that emerge from this challenge in the coming years. This initiative is expected to solidify the UK’s position as a leading renewable energy nation.

Source: https://www.gov.uk/government/news/new-challenge-launched-to-store-clean-energy-for-longer-and-protect-households-from-price-spikes

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