RheEnergise: Investing in energy storage

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Stephen Crosher, CEO of RheEnergise, discusses the future of energy and the growing importance of energy storage as part of the energy mix.

Twenty-first-century trends in energy are now crystal clear: within a generation, renewable power will dominate, and fossil-fuel assets will be, at best, chronically underutilised and probably stranded.

Transitioning to ultra-low carbon generation brings both challenges but also unparalleled opportunities. Power generation, which will increasingly serve mobility, heat, and industry, will be monopolised by wind, solar, nuclear and potentially tidal power.

There are many opportunities, worth billions, if not trillions, in financing new clean generation assets with abundant banks and infrastructure funds willing to make those investments. However, the energy system will increasingly become one where generation and supply do not match demand, and demand does not fit the generation supply profile. Everything is out of balance over short, medium, and long periods. In addition, due to climate change demands, filling the gaps with gas generation will not be a realistic long-term option.

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Different forms of flexibility or energy storage systems will solve the significant mismatch between generation and demand or the intermittency problem. The solutions must provide services over different time periods, from seconds (frequently) to weeks (very occasionally). These providers of technical solutions for flexibility will become huge companies (the green unicorns) over the next 20 years, with revenues measured in billions.

A clear example of the growth we should now expect for the flexibility solution providers can be taken from a company like the wind turbine company Vestas, the world’s largest manufacturer of wind turbines. Vestas made their first sale in 1979; by 2000, turnovers were €868 million, and by 2022, revenues were €14.5 billion. The growth is not expected to slow, as there is considerable pressure to grow renewable energy generation deployment by 300% over the next seven to 10 years.

We can expect that a handful of companies will dominate the short-duration energy storage market, a further handful will dominate the inter-seasonal energy storage market, and lastly, there will be several companies that dominate the medium-duration energy storage space, such as RheEnergise.

The medium-duration energy storage space, providing grid flexibility, is the part of the market where the most significant trading volume will occur. It is the part of the market that will do the heavy lifting, at low cost, to balance the daily cycles of solar (and tidal) and the twice-weekly cycles of wind.

There will be significant investment wins in deploying capital into infrastructure, but even bigger investment win-wins into the solution providers, those providing the new physical infrastructure plant and equipment.

RheEnergise is a UK-based company bringing innovation to pumped energy storage with a grid-scale solution called High-Density Hydro®, providing four to 16 hours of energy storage in the 10MW to 100MW power range. The company is currently fundraising directly with family offices and institutional investors and also on Crowdcube for retail investors. The funds raised are to accelerate our commercialisation and strengthen our IP portfolio. Click here to access the page.

Investment risk warning: Don’t invest unless you’re prepared to lose all the money you invest. This is a high-risk investment, and you are unlikely to be protected if something goes wrong. You can find out more here.

14 October 2025
InterContinental, Santiago, Chile
We are excited to bring the industry together for the fourth edition of the Energy Storage Summit Latin America on 14-15 October in Santiago, Chile. The Summit has become a meeting place for IPPs and developers, investors, financiers and banks, utilities, consultancies, software providers, and manufacturers who are setting high standards in the Latin American energy storage sector.
14 October 2025
10am PDT / 6pm BST
Join Wärtsilä battery analytics experts Andrea Meister and Steve Merrick for a critical session that cuts through the confusion surrounding state of charge (SoC), state of health (SoH), cell imbalance, and round-trip efficiency (RTE)—parameters that directly impact real-time operations and revenue. As grid demands intensify and performance expectations rise, the margin for error is shrinking. Andrea and Steve will unpack how these metrics are measured, how errors and degradation develop, and how to proactively avoid them. You’ll gain practical insights into how these factors influence real-time usable energy and system performance.
14 October 2025
Brussels, Belgium
can be added on the Energy Storage News event page. The Energy Storage Global Conference 2025 takes place form 14-16 October and will bring together representatives from across Europe to discuss the evolving landscape of energy storage. The programme will focus on policy, market dynamics and regional developments, while also addressing key issues such as legislative challenges, safety guidelines and decarbonisation strategies. Participants will gain insights into financing and market opportunities, as well as the unique advancements and integration efforts taking place within the Benelux region. For more information on the conference, please visit: https://www.accelevents.com/e/ENERGY-STORAGE-GLOBAL-CONFERENCE-2025?aff=EnergyStorageNews
14 October 2025
The Marble Arch Hotel, London, UK
As developers and investors expand into new markets and more projects approach commissioning, this Summit provides the platform to address the key challenges of battery asset management head-on. In 2025, the programme will centre around three essential themes: Revenue & Trading, the Lifecycle of the Battery, and Optimisation Tools for Success. With deep dives into core markets—including the Nordics, Iberia, Italy, Germany, the UK & Ireland, and the Benelux region—you’ll gain the insight needed to position yourself as a leader in battery asset performance and strategy.
21 October 2025
360 Madison Avenue, New York
Returning for its 12th edition, Solar and Storage Finance USA Summit remains the annual event where decision-makers at the forefront of solar and storage projects across the United States and capital converge. Featuring the most active solar and storage transactors, join us for a packed two-days of deal-making, learning and networking.
22 October 2025
2pm BST / 3pm CEST
Join our expert panel for this solutions-focused webinar where we’ll reveal how leading asset managers are transforming operations through a practical data-exchange architecture that standardises telemetry and metadata, embeds auditability into workflows, and ensures all stakeholders access the same accurate information through a Partner API. With analytics-ready data in place, you’ll discover how to apply advanced battery analytics that reduce downtime by up to 15% and increase the return on every asset under management.

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