Mercia PR weighs up High-Density Hydro

4 October 2023



Mercia Power Response, a provider of flexible power response services to the UK grid, has signed an agreement with RheEnergise to explore the potential deployment of RheEnergise’s High-Density Hydro® (HD Hydro) concept for long-duration energy storage. The two companies’ initial focus will be the feasibility of getting 100 MW of HD Hydro in commercial operation by 2030 by using Mercia PR’s existing grid connections.


Rather than using water, HD Hydro it uses a fluid which is 21⁄2 times denser than water, and which can provide 21⁄2 times the power for a given footprint when compared with conventional hydro, meaning that HD Hydro can make use of hills rather than mountains, “opening up massive opportunities in the UK and around the world”, says RheEnergise.

“We see enormous potential for HD Hydro deployment as a future low-carbon alternative to our existing gas-powered assets,” said Graham White, CEO at Mercia PR.



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