With 2030 climate goals looming, the global energy market is rapidly shifting. Here in the UK, storage technologies have become more important for renewable energy companies than ever. Storage solutions address the natural variation of renewable energy sources like wind and solar. In doing so, they ensure a reliable and sustainable green energy grid. From cutting-edge battery storage to large-scale energy systems, innovative companies across the UK are driving the clean energy transition.
Here are five UK-based renewable energy storage companies to watch in 2025:
1. Highview Power
Highview Power is redefining long-duration storage with its Liquid Air Energy Storage (LAES) technology, a sustainable alternative to lithium-ion batteries. In June 2024, the company secured a landmark £300 million investment from the UK Infrastructure Bank and Centrica. This investment is supporting the development of the UK’s first commercial-scale LAES facility.
The Carrington Project, now under construction at Trafford Energy Park near Manchester, will store 300 MWh of energy and deliver 50 MW over six hours.
Once operational in 2026, the site will be capable of powering nearly half a million homes, while also providing critical grid stabilisation services. Highview’s ambitions don’t stop there. Plans are in place to roll out four additional 2.5 GWh storage sites, starting in Hunterston, Scotland.
2. Zenobe Energy
Zenobe Energy continues to be a frontrunner in large-scale battery storage and electric vehicle (EV) fleet electrification. In early 2025, Zenobe launched Europe’s largest battery storage site at Blackhillock in Scotland.
The first phase offers 200 MW / 400 MWh of capacity, with a second phase set to increase this to 300 MW / 600 MWh by 2026. The site is capable of delivering electricity to over 3 million homes for one hour.
Blackhillock is set to make history, upon completion it will be the world’s first transmission-connected battery to provide full active and reactive power services to the National Grid, ensuring stability and resilience as fossil fuels are phased out. Zenobe plans to invest a further £1 billion across Scotland, with additional major storage projects in Kilmarnock and Eccles.
The company is also making waves in circular battery solutions, redeploying second-life EV batteries for stationary storage to reduce waste and extend asset lifespans.
3. Exagen
Recently acquired by Octopus Energy Generation, Exagen is fast becoming a major player in solar and battery hybrid development. The company has a robust 2.4 GW pipeline of projects across England, with over 520 MW of battery storage already granted planning consent in the past year alone.
The acquisition by Octopus in September 2024 has supercharged Exagen’s ability to deliver flexible, decentralised clean energy infrastructure.
By integrating advanced battery storage with solar generation, Exagen is not only increasing renewable generation capacity but also enhancing the responsiveness of the UK’s energy grid.
4. Moixa
Moixa, recently aquired by Lunar Energy, is on a mission to democratise energy storage, one home at a time. The company’s compact smart batteries allow homeowners to store excess solar energy, cut carbon emissions, and save on bills. But Moixa’s real innovation lies in its GridShare platform, an AI-driven software that connects thousands of home batteries to form virtual power plants (VPPs).
These VPPs intelligently balance supply and demand, providing real-time support to the grid and unlocking value for customers. Moixa has also partnered with major automotive firms to embed its smart energy management systems into electric vehicles, expanding its role in the energy transition from homes to motorways.
5. Storelectric
Storelectric is developing geological energy storage solutions through its patented Compressed Air Energy Storage (CAES) and Hydrogen CAES technologies. Its flagship Green CAES system stores surplus renewable electricity by compressing air and pumping it into underground salt caverns. When power is needed, the air is released through turbines to generate electricity, offering energy storage over days, weeks and even months.
Storelectric stands out in the energy storage landscape for its unique approach to repurposing existing underground salt caverns. This strategy offers key advantages, enabling lower capital expenditure, faster deployment timelines, and reduced environmental impact. Unlike many technologies that rely on above-ground, purpose built infrastructure, Storelectric’s model leverages existing geological formations.
Storelectric has also developed a Hydrogen CAES system that integrates compressed air storage with thermal energy recovery and hydrogen production. This has the potential to combine energy storage with cost efficient green hydrogen production and storage.
With the capacity to provide ancillary services and grid flexability, Storelectric’s systems are critical infrastructure for a fully renewable future.
Why UK Renewable Energy Storage is Critical for Net-Zero
Achieving net-zero emissions requires a resilient energy system capable of balancing intermittent renewable sources. Without sufficient storage, surplus wind or solar energy will continue to be wasted. This means we will continue to fall back on fossil fuels during power shortfalls. Energy storage balances supply and demand of renewable energy, providing power when it is most needed.
Beyond balancing, storage supports grid stability, improves system resilience, and enables decentralised energy systems – all vital for meeting climate goals.
UK Renewable Energy Storage Market Trends
The UK’s energy storage market has grown significantly over the past five years. By early 2025, installed storage capacity exceeded 4 GW, and current projections indicate it could double by 2030.
This rapid expansion has been fuelled by supportive government policies, including new funding mechanisms for long-duration energy storage (LDES). Investment has accelerated, with both the UK Infrastructure Bank and private sector players backing the scale-up of energy storage.
Globally, the energy storage sector is experiencing a surge. In 2025, around 222 GWh of new storage capacity is expected to be added worldwide: a 26.5% increase year on year. Emerging markets, led by Africa and the Middle East, are beginning to scale up their capacity. Meanwhile, steady growth continues across the Americas, Europe, and China. At the same time, the global hydrogen market, valued at $155 billion in 2022, is projected to reach $292 billion by 2032.
The UK is positioning itself as a leader in this space, driven by ambitious renewable energy targets and enabling policy frameworks. As part of its Clean Power 2030 action plan, the government aims to double onshore wind capacity to 30 GW by the end of the decade. Achieving this will require a strong and responsive storage infrastructure, developed by innovative renewable energy storage companies.
The Future of UK Energy Storage
The next decade will see storage technologies move from supplementary to central components of the energy system. Emerging technologies like Compressed Air Energy Storage (CAES), Liquid Air Energy Storage (LAES), gravity-based storage, and flow batteries are expected to complement and, in some cases, outperform traditional lithium-ion batteries in terms of longevity and scalability.
As innovation accelerates and costs fall, the UK is poised to become a global leader in clean energy storage solutions, ensuring that renewables power the nation not just when the wind blows or the sun shines – but whenever and wherever it is needed.
