News
Articles, Podcasts, TV News & Latest Updates
Innovation & Growth
2025
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
Ex-GE Hydro CEO Yves Rannou joins the board of RheEnergise
Yves Rannou, former President & CEO of Alstom Wind and of GE Hydro amongst others, has joined the board of RheEnergise, the UK company that is developing a new and advanced form of long duration hydro-energy storage (LDES) with its proprietary High-Density Hydro® solution.
21st October 2025
A visit to RheEnergise's powerhouse at the demonstrator project,
20th October 2025
Stephen Crosher CEO and Valerie Lamneta R&D Engineer take us on a guided tour of the Powerhouse where we can see the complaetion of main mechanicals.
Stay tuned as we approach an important milestone.
20th October 2025
NEWS
RheEnergise completes mechanical work at long-duration hydro energy storage system demonstration plant
UK storage developer RheEnergise has completed “the main mechanical works” at its long-duration hydro-energy storage system facility in Devon.
The company described the Cornwood research and development (R&D) demonstrator, near Plymouth, as a “real-life test laboratory” for its technology, which combined long-duration energy storage (LDES) and pumped hydro technology.
2nd September 2025
At The Power Table
Interview with Lizzi Gold, Business Development Manager at RheEnergise
This month at At The Power Table, we’re joined byLizzi Gold: business development manager, innovator, and unapologetic clean energy agitator.
Together, we unpack the great unsung hero of the renewable revolution: energy storage. Batteries, long-duration tech, public perception — we’re prying open the lid on all of it. Because honestly, if people got energy storage, wouldn’t we already be living in a low-carbon utopia by now?'
19th September 2025
PODCAST INTERVIEW
Talks with Turquoise
Turquoise Managing Director Ian Thomas sits down with Stephen Crosher, CEO of RheEnergise, to discuss the company’s innovative High-Density Hydro® (HD Hydro®) technology, a next-generation approach to pumped hydro storage.
23rd Octobber 2025
Long Duration Energy Storage: RheEnergise secures £2.15m grant from European Innovation Council
EIC Accelerator grant to support RheEnergise’s R&D as it moves to its first commercial storage scheme
RheEnergise is the only LDES company to secure EIC funding and one of only three UK companies to secure an EIC grant. The EIC grant award coincides with investor roadshow in Canada.
2nd July 2025
RheEnergise secures £2.15 million grant from European Innovation Council for long-duration energy storage
RheEnergise, the UK company that is developing a new and advanced form of long-duration energy storage, has secured a £2.15 million (2.5 million euros) from the European Innovation Council (EIC) Accelerator to support the company’s R&D work.
2nd July 2025
PRESS RELEASE
RheEnergise Completes Main Mechanicals Work at its Cornwood Energy Storage Demonstrator in Devon
RheEnergise to start LDES operations at Cornwood in the autumn, as part of the R&D pathway to its first commercial scale project
1st September 2025
PRESS RELEASE
RheEnergise Kicks Off North American Fundraising on Republic
Innovative energy storage company invites public investment to scale its High-Density Hydro® solution across the U.S. and Canada
28th July 2025
RheEnergise on BBC Breakfast
Broadcast on BBC Breakfast News on the 31st January 2025. Justin Rowlatt, BBC Climate Editor meets Stephen Crosher, CEO of RheEnergise at the demonstrator project site in Devon, UK.
31st January 2025
RheEnergise completes main mechanical works at Cornwood energy storage project
RheEnergise has completed the main mechanical works at its long-duration energy storage demonstrator project in Cornwood, near Plymouth, Devon.
The project is part of the company’s research and development programme and is intended to support the commercial rollout of its pumped hydro storage technology.
1st September 2025
NEWS
UK High-Density Hydro energy storage firm granted £2M by European Innovation Council
RheEnergise, a British company innovating High-Density Hydro long-duration energy storage, has been awarded a €2.5M (£2.15M) grant by the European Innovation Council (EIC) Accelerator programme...
2nd July 2025
NEWS
500KW High Density Hydro® demonstrator in Plymouth presents new potentials for future energy storage
RheEnergise's proprietary High Density Hydro® technology could be the future of energy storage, but before that it needs to be proven using a scale demonstrator.
RheEnergise is a long duration...
22nd May 2025
EVENT VIDEO
RheEnergise | Solving 24/7 Renewable Power for Data Centers with High-Density Hydro®
A presentation (in Texas in March 2025) on how 24/7 power can be provided to data centers of all scales using renewable power and RheEnergise’s High-Density Hydro® long-duration energy storage solution, without needing to resort to back-up...
30th May 2025
NEWS
RheEnergise launches our Canadian fundraising campaign
We have begun the launch of our North American fundraising campaign, seeking visionary investors to accelerate the clean energy transition.
30th May 2025
NEWS
Innovative Thinking: How a pumped hydro innovation using fluid 2.5x denser than water could change energy storage
An innovative “high-density hydro” project that uses fluid that is 2.5x denser than water could open whole new possibilities for future pumped storage hydropower developments.
5th February 2025
FEATURE
des technologies propres - Cas d’affaires RheEnergise
L’Hydro Haute Densité® (Hydro HD®) est une forme de stockage d’énergie gravitationnelle de nouvelle génération qui fonctionne comme une batterie géante. L’Hydro HD s’inspire de la technologie de stockage d’énergie la plus éprouvée et la plus mature au monde : le stockage d’énergie par pompage (STEP), mais fait de manière plus intelligente, plus rapide et plus évolutive.
14th Mai 2025
PRESS RELEASE
Anglesey Mining plc and RheEnergise Partner to Explore Underground Energy Storage at Parys Mountain Mine
Anglesey Mining plc and RheEnergise are pleased to announce the signing of a memorandum of understanding (MOU) to explore the potential deployment of RheEnergise's innovative High-Density
Hydro® (HD Hydro) energy storage technology at the Parys Mountain mine site.
18th February 2025
2024
NEWS
Pumped up: how 'high density hydro' could supercharge global energy storage
Say energy storage and most people imagine EV lithium-ion batteries. But a range of "long duration" concepts that store power for weeks rather than hours are coming to market, among them one called high-density hydro that uses a mud-brown slurry pumped through a long loop of plastic pipe on a hillside to store energy until it's needed. With the first systems now being built, the technology could change the way renewables-powered grids work in the future.
11th October 2024
NEWS
Reduce minimum project size’: UK long-duration support scheme analysis and reaction
We take a look at the UK government’s latest proposal for its long-duration energy storage (LDES) cap-and-floor scheme, how it differs from the initial programme, and get the views of LDES technology firm RheEnergise.
17th October 2024
Industry backs UK energy storage plans
The renewables industry has given thumbs up to the UK government’s proposal to help build energy storage infrastructure, including the first significant long duration energy storage facilities in nearly 40 years.
10th October 2024
BLOG
Boosting Renewable Energy: The Power of RheEnergise
The world is in a climate emergency. Higher levels of clean, renewable energy are urgently required, a flexible and secure energy system is necessary with more and different types of energy storage solutions needing to be deployed. As a developer of a pioneering form of storage, we are asked a multitude of questions about our high-density long duration energy storage (LDES) solution.
14th August 2024
How technology is reshaping farming
UK growing conditions for fruit and vegetables are changing all the time in the face of climate change. So, engineers are coming up with ideas to help farmers increase their crop yields in an ever more challenging environment – from robots to monitor and harvest crops, to automated vertical farms that reduce land use.
10th September 2024
RheEnergise to deploy High-Density Hydro® long duration storage demonstrator at Sibelco Cornwood
RheEnergise, a UK company that is developing a new and advanced form of long-duration hydro-energy storage system, is to build its first-of-a-kind demonstrator of the system at Sibelco’s mining operations at Cornwood, near Plymouth. Work onsite to build the demonstrator will start imminently with its commissioning to start in September 2024.
29th April 2024
NEWS
How energy storage fits into Alberta’s future electricity grid
By this fall, Alberta will know what its overhauled electricity system will look like, and how energy storage, a vital component of energy security, will be factored into future-proofing the grid.
20th June 2024
NEWS
Long-duration energy storage “a game-changer” for net zero, says RheEnergise CEO
“In terms of energy storage, we are just scratching the surface of the scaling challenge that is so phenomenally big,” Stephen Crosher, CEO of RheEnergise, told Power Technology at the Reset Connect conference in London on 25 June.
27th June 2024
PODCAST
WICKED PROBLEMS:Fear and Loathing in Aberdeen. ECHR Judgment Day. Data Centre Problems, and $4 Trillion LDES Solutions
RheEnergise CEO Stephen Crosher; Green Web Foundation director Chris Adams; Daily Telegraph Energy Editor Jonathan Leake; ex-CNN and Bloomberg correspondent Ryan Chilcote join the show.
18th April 2024
2023
Vertical farming consortium secures UK Government funding to advance low-emission food production using energy storage
A consortium of four British companies, comprising UK Urban AgriTech (UKUAT), Intelligent Growth Solutions Ltd, RheEnergise and James Hutton Institute has received a grant from the UK Government to advance the development of low-carbon and low-cost food production by co-locating renewable energy with vertical farms.
6th December 2023
RheEnergise signs MOU with leading Chilean utility to develop long duration energy storage projects
Pumped hydro forms the largest percentage of energy storage in the world. Traditionally needing large elevations and huge reservoirs - finding locations suitable for pumped hydro projects is often limited. High-Density Hydro is taking the premise of pumped hydro, removing those barriers and doubling the output.
14th November 2023
RHEENERGISE
SIGNS MOU WITH LEADING CHILEAN UTILITY COLBUN TO DEVELOP LONG DURATION ENERGY STORAGE PROJECTS IN CHILE
RheEnergise’s first entry into South America’s energy market
14th November 2023
Modo Energy: The Podcast -
High-Density Hydro with Lizzi Gold
Pumped hydro forms the largest percentage of energy storage in the world. Traditionally needing large elevations and huge reservoirs - finding locations suitable for pumped hydro projects is often limited. High-Density Hydro is taking the premise of pumped hydro, removing those barriers and doubling the output.
17th August 2023
Ten energy storage technologies that want to change the world
As COP28 calls for a tripling of renewable energy, storage technologies beyond the lithium-ion battery will play key roles. Recharge rounds up 10 of the most innovative recently in the headlines
30th November 2023
RHEENERGISE
SIGNS TURBINE MANUFACTURING CONTRACT WITH HYDROPOWER ENGINEERING IN TURKEY
First-of-a-kind 500kW HD TurbineTM to be installed at RheEnergise’s long duration energy storage demonstrator in the UK
4th October 2023
RheEnergise and Colbún sign MoU for long duration energy storage projects in Chile
Colbún, Chile's third-largest power generation company and a prominent hydropower operator, has entered into a partnership with RheEnergise, a UK-based clean technology firm, to investigate the viability of deploying RheEnergise's innovative long-duration hydro-energy storage solution, High-Density Hydro® (HD Hydro), in Chile. The agreement marks RheEnergise’s first entry into South America’s energy market.
14th November 2023
Mercia Power Response and RheEnergise target 100MW of high-density hydro energy storage
Two new partners will explore installation of high-density hydro energy storage with 100MW capacity by 2030.
16th August 2023
RheEnergise enters Chilean storage market
Developer of High-Density Hydro (HD Hydro) technology will work with Colbún to scope out 10MW project
14th November 2023
NEWS
Professor Richard Cochrane
It is with great sadness that we share the news of Richard Cochrane's, passing. Richard was one of the four founders of RheEnergise, acting as Chief innovation Officer, and a huge part of our progress in the early years.
20th June 2023
Hydro Reinvented. Why Size Matters
The novel Energy Storage Solution that‘s winning the hearts of investors.
12th April 2023
RheEnergise signs turbine manufacturing contract with Hydropower Engineering in Turkey
UK clean technology company RheEnergise, currently developing a new and advanced form of pumped hydro-energy storage called HD Hydro, has placed its first turbine order with the Turkish engineering company, Hydropower Engineering (HPE).
4th October 2023
Cultivating Conversations : Ep 9 - Energy Storage Re-imagined
Clare Nasir talks with RheEnergise's co-founder and CEO, Stephen Crosher. They've created a smart, simple solution to energy storage using a high density hydro-solution.
12th April 2023
Weekend Read: Light weight
When it comes to gravity batteries, pumped-hydro storage is the gold standard, but its cost and topography-specific limitations are driving innovations ranging from freight-train braking to super-dense liquids. We consider whether any of the new technologies can punch above their weight.
4th March 2023
Long duration energy storage: Mercia Power Response and RheEnergise eye 100MW in UK
Companies team up explore options for deploying RheEnergise's pumped hydro energy storage technology at Mercia Power Response's grid connections across the UK
18th August 2023
High tech fluid makes pumped hydro more affordable
A company is deploying a first-of-its-kind demonstrator of an advanced long-duration, hydroelectricity storage system
24th Feb 2023
UK players form 100MW hydro, storage partnership
UK-based Mercia Power Response has signed an agreement with RheEnergise to explore the potential deployment of long-duration hydro-energy storage, known as High-Density Hydro (HD Hydro).
16th August 2023
Testing quarry tailings for use as hydro-energy fluid
RheEnergise and partners secure £1 million grant to examine use of tailings in hydro-energy storage system.
9th Feb 2023
PRESS RELEASE
Next generation innovators powering UK towards net zero to get £24 million cash boost
Energy entrepreneurs to get the chance to turn their green technology ideas into reality thanks to government funding.
8th Feb 2023
Les promesses du stockage d’énergie par pompage
Les mégawatts d’électricité éolienne et solaire se multiplient comme des petits pains. Mais que faire quand le soleil ou le vent sont si forts que la production surpasse la consommation ? Aux quatre coins du monde, des projets de stockage d’énergie par pompage voient le jour. Le Canada est en retard, paradoxalement en raison de sa richesse hydroélectrique.
23rd June 2023
RheEnergise® News Archive 2019 - 2022