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.

25 August 2026
São Paulo, Brazil
ees South America, LATAM’s key event for batteries and energy storage systems, focuses on energy storage solutions suited to support and complement energy systems with increasing shares of renewable energy, while integrating prosumers and electric vehicles. The event is strongly rooted in the LATAM region and highlights the strategic relevance of sector coupling across electricity, heat and mobility. As part of it, “element1,” a dedicated special exhibition, spotlights the high potential of green hydrogen in Brazil. ees South America brings together investors, utilities, installers, manufacturers and project developers from all over the world.
25 August 2026
Sydney, Australia
Building on our successful global portfolio of energy storage network events including our successful Energy Storage Summit Australia, combined with the exponential buildout of large-scale energy storage, we are delighted to return for the inaugural Battery Asset Management Summit Australia in Sydney (25-26 August 2026). The Battery Asset Management Summit has been received worldwide with huge optimism and has quickly established itself as leading event series for connecting asset owners with optimisers, software providers, and many more.
1 September 2026
Dubai World Trade Centre, Dubai
From first specification to final financing, Middle East Energy is where the world’s energy industry comes to do business. Three days in Dubai to source electrical infrastructure, evaluate technology and move power projects forward.
1 September 2026
Dubai World Trade Centre, Dubai
Co-located with the extremely well renowned Middle East Energy Show, join us for the inaugural Energy Storage Middle East Summit in Dubai, April 2026, as we bring our world leading energy storage series to one of the world’s fastest-growing BESS markets. This landmark event will explore the Middle East’s trajectory to become the third largest storage market globally by 2026, with a special focus on the region’s ambitious renewable energy targets and BESS integration strategies.
8 September 2026
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Battery & Energy Storage Tech Europe (BESTE) is Europe’s industrial scaling platform for stationary and industrial battery applications — not EVs. Taking place 8–9 September 2026 at Fira de Barcelona, BESTE brings together utilities, IPPs, energy-intensive industries, data centres, ports, rail, maritime, defence and aerospace OEMs — all deploying or integrating battery storage at scale. Over 100 companies already confirmed — including EDP Renewables, Acciona, Endesa, Naturgy, Neoen, Galp, Basquevolt and Veolia — alongside 40+ expert speakers and international institutional support from BEPA, BVES, LDES and Volta Foundation. Where Europe’s battery & ES ecosystem turns projects into reality.
9 September 2026
Schaumburg, Illinois
RE+ Midwest brings together clean energy businesses, utilities, professionals, and policymakers to explore the technologies, trends, and opportunities shaping the Midwest energy market. Following a successful 2025 event that welcomed more than 1,200 attendees and 90 exhibitors, RE+ Midwest continues to highlight the region’s growing role in advancing solar, energy storage, EV infrastructure, and grid modernization. From rustbelt to greenbelt, the Midwest is helping drive the future of clean energy forward.

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