RheEnergise: Investing in energy storage

February 8, 2024
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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.

20 May 2026
London, UK
The Renewables Procurement & Revenues Summit serves as the UK and Irish platform for connecting renewable energy suppliers to the future of energy demand. This includes bringing together a community of European off-takers, renewable generators, utilities, asset owners, and financiers. The challenges ahead are complex, but through collaboration, innovation, and a shared vision, we can navigate uncertainties and forge a sustainable energy future. Let us harness our collective knowledge to advance the renewable energy agenda.
2 June 2026
10am BST / 11am CEST
This webinar will provide a comprehensive overview of the current grid constraint landscape in Germany, with a focus on what it means in practice for the storage business case. Attendees will gain a clear understanding of how ramp rate restrictions and grid limitations translate into concrete business model challenges, with real-world examples illustrating how developers can structure tailored, constraint-aware models for a single project, including the multiple-scenario analyses increasingly required in Flexible Connection Agreement (FCA) processes. The session will then address the critical question of financing: how do route-to-market (RTM) players continue to assess and price battery projects in a constrained environment? And what do lenders actually need to see to get comfortable?
9 June 2026
Stuttgart, Germany
Held alongside The Battery Show Europe, Energy Storage Summit provides a focused platform to understand the policies, revenue models and deployment conditions shaping Germany’s utility-scale storage boom. With contributions from TSOs, banks, developers and optimisers, the Summit explores regulation, merchant strategies, financing, grid tariffs and project delivery in a market forecast to integrate 24GW of storage by 2037.
23 June 2026
Munich, Germany
Every year, ees Europe, Europe’s largest and most international exhibition for batteries and energy storage systems, provides a networking opportunity for the industry’s key players – all under the motto “Innovating Energy Storage”. It focuses on the latest technologies, trends and market developments. ees Europe will take place from June 23–25, 2026 – for the first time running from Tuesday to Thursday – as part of The smarter E Europe at Messe München.
23 June 2026
Toronto Congress Centre, Canada
Battery Asset Management Summit is a globally recognized Summit series focused exclusively on the operational, commercial, and technical performance of utility-scale battery assets. In 2026, the Summit arrives in Canada for the first time, at a pivotal moment for the country’s energy storage market and wider energy transition.
30 June 2026
Novotel London West, London, UK
The Clean Power Summit 2026 is the UK’s premier event for stakeholders driving the clean energy transition. As renewable capacity is forecast to nearly triple by 2035, this Summit offers a unique platform to shape the future of lowcarbon power, strengthen energy sovereignty, and unlock economic growth. Bringing together policymakers, developers, investors, network operators, and industry enablers, the Summit delivers actionable strategies to achieve the UK’s 2030 clean energy targets. With four dedicated content streams, attendees will gain exclusive insights into offshore wind expansion, floating wind innovation, regional manufacturing, and grid upgrades across the North Sea. This is your opportunity to connect with key decision-makers, explore investment opportunities, and collaborate on solutions to navigate complex supply chains and policy frameworks. The Clean Power Summit 2026 ensures stakeholders are equipped to turn ambition into action, driving progress and securing a sustainable energy future for the UK.

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