EIC Support RheEnergise
The European Innovation Council (EIC) selected 40 innovative start-ups and SMEs to receive funding in July 2025. Out of 150 proposals that reached the interview stage, RheEnergise was selected amongst those companies which were chosen for their transformative technologies and strong commercial promise, securing a mix of grant and equity support.
The EIC Accelerator supports start-ups and small businesses with grant funding of up to
€2.5 million, complemented by equity investments from the EIC Fund ranging between
€0.5 million and €10 million. Higher amounts are available under the EIC
STEP Scale-up scheme, which allows for equity support of up to
€30 million.
Beyond financial support, all funded projects gain access to Business Acceleration Services, connecting them with top-level experts, investors, corporates, and innovation ecosystem players.
LDES-HDHydro Project
As renewable energy deployment grows, grid operators face challenges in balancing intermittent generation from wind and solar.
European policies like the REPowerEU Plan, Green Deal, and Net-Zero Industry Act emphasise the urgent need for scalable energy storage to support renewable integration and net-zero goals. Existing alternatives—such as lithium-ion batteries—offer short-duration storage (2-4 hours) and are subject to supply chain vulnerabilities and raw material dependencies, affecting their scalability.
Traditional pumped hydro energy storage (PHES), while proven, has long permitting cycles, high CAPEX, and strict geographical requirements.
We have developed HD Hydro®, an innovative pumped hydro technology that unlocks energy storage on small hills instead of mountains.
By utilising a high-density fluid (HDF) that is 2.5x denser than water, HD Hydro® can store 4-16+ hours of energy in sites previously unsuitable for PHES, dramatically expanding the number of viable locations for pumped hydro projects. It is cost-effective, modular, and integrates seamlessly with grid infrastructure, making it a superior and scalable choice for LDES.
HD Hydro® is attractive to utilities, renewable energy and independent power developers.
We have made significant progress, including:
With this project we will:
- TRL6 validation through a 500 kW demonstration project in Plymouth, UK.
- 20 patents across 11 families protecting our technology.
- Strong partnerships with industry leaders, universities, and investors.
- Optimise and demonstrate the HD Turbine technology, including lab testing, fluid dynamics validation, and component optimisation.
- Finalise the manufacturing and scale-up strategy for a 5 MW prototype, leveraging advanced manufacturing methods.
- Advance to TRL8, positioning HD Hydro® for full-scale commercial deployment.
Co-funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union. Neither the European Union nor the granting authority can be held responsible for them.
News
NEWS
Saskatchewan Research Council (SRC) Slurry Pipeline Systems Course
Valerie Lamenta and Joris Naudin, had a wonderful time this month at the Saskatchewan Research Council (SRC) head office in Saskatoon. In participation with Paterson & Cooke USA, Ltd. , and Weir Minerals, the team participated in the Slurry Pipeline Systems Course..
May 2026
NEWS
BBVA Energy Tech Summit
The energy (pun intended) was incredible, and it was a great to engage in so many conversations about the revolutionary benefits of our High-Density Hydro solution.
April 2026
SUCCESS! Full Power Achieved
We are utterly thrilled to announce that our first ever High-Density Hydro project in Devon, UK is now producing full power, at the predicted output and on a consistent basis.
Everyone on the RheEnergise team is delighted that the system has reached full power and is performing exactly as predicted. What this means is that we have proven and critically de-risked our High-Density Hydro® technology which will allow us to focus on deploying the solution in commercial-scale Long Duration Energy Storage (LDES) schemes in the UK and worldwide.!
27th January 2026
NEWS
What a fantastic day we had at Enlit Europe yesterday! We started early with an insightful presentation from Lizzi Gold with the Department for Business and Trade, showcasing our solution to our contemporaries.
We then took part in a thought provoking session at the Energy Storage and Flexible Demand hub, where Stephen Crosher presented on how we unlock the potential of hydropower for high energy users and data centres.
November 2025
EVENT
Energy Technology Live in Birmingham.
Finn Howley sat on an incredibly informative panel on “Finding the Right LDES Solutions” alongside Michael Simpson from Keep Energy Systems, George Giles from Invinity Energy Systems, Gavin Donaldson from Highview, chaired by Pat Lambert from Energy Storage Ireland. .
May 2026
RheEnergise commissions first ‘high density hydro’ long-duration storage in UK
Pilot long-duration energy storage (LDES) project uses low viscosity, denser-than-water fluid. RheEnergise is panning for future projects in 10 MW to 100 MW range, with six to 20 hours of storage capacity.
27th January 2026
Pumped Hydro Energy Storage Is Having a Renaissance
As the world looks to incorporate more renewables into energy grids, centuries-old systems that can balance supply and demand are being reappraised and innovated upon..
18th December 2025
NEWS
Once again an incredibly insightful day today in Paris. It’s amazing to be amongst motivated and resourceful colleagues, contractors, policy makers and investors who all see just how essential PSH will be to guaranteeing a strong and reliable grid.
As Malcolm Turnbull said in his closing remarks, the global activity in our industry has never been so great, and we are constantly accelerating. With thanks to the International Hydropower Association (IHA) for a great event, and to all those who were fascinated by the potential our HD Hydro solution holds..
October 2025
EVENT
Our BDM Lizzi Gold joined a panel at Solar & Storage Live to tackle a critical question: How do we secure the UK’s energy future beyond Lithium-ion?
With 200GW in the GB grid queue and 90% of the Li-ion supply chain concentrated in one region, diversification isn't just a choice, it’s a necessity.
The panel highlighted:
• Security of Supply: The need for diverse LDES technologies.
• Policy Evolution: Shifting rewards toward local supply chains and long asset lifetimes.
• Grid Stability: Prioritising services like spinning inertia.y using a first of a kind hydropower system embedded underground.
May 2026
NEWS
On the 11th of February we were thrilled to host British Hydropower Association (BHA) members at our project site to show our industry partners the scale of our success.
With experts from across the hydropower industry including from AECOM, R&A Group LTD, Thordon Bearings Inc. and Dulas Ltd, we were pleased to show our engineering expertise off to such respected partners in our field.
February 2026
First of its kind 'high-density hydro system begins generating electricity in Devon
Project employs technology that can be used to store and release renewable energy using even gentle slopes
BA hillside "battery" outside Plymouth in Devon has begun generatiing electricity using a first of a kind hydropower system embedded underground.
The pioneering technology means...
27th January 2026
UK
RheEnergise Limited
Collective Auction Rooms
Room 302
5-7 Buck Street
London
NW1 8NJ
RheEnergise Limited | Company number 11927250
Registered office: Collective Auction Rooms, 5-7 Buck Street,
London, United Kingdom, NW1 8NJ
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