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    RheEnergise at Sibelco’s Cornwood mine: design and grid lessons for UK sites

    January 27, 2026|

    Reviewed by Joe Ashwell

    RheEnergise at Sibelco’s Cornwood mine: design and grid lessons for UK sites

    First reported on International Mining – News

    30 Second Briefing

    RheEnergise’s first commercial High-Density Hydro® long-duration energy storage system is now delivering full, predicted output on a continuous basis to Sibelco’s Cornwood kaolin mine in Devon, using an energy-dense fluid rather than water to increase storage capacity on modest head heights. The closed-loop system is integrated directly with the mine’s power demand profile, supporting around-the-clock processing loads and reducing reliance on grid imports at a constrained rural connection. For other UK mine and quarry sites with limited elevation and weak grid capacity, the project provides an early operational reference for sub-surface or brownfield hydro storage deployment.

    Technical Brief

    • For other UK mining sites, the scheme provides a reference for hydro storage without large dams or reservoirs.

    Our Take

    Kaolin appears only rarely in our Mining coverage compared with bulk commodities like iron ore or copper, so a long-duration storage application at Sibelco’s Cornwood kaolin mine in Devon signals that industrial minerals operations are starting to trial decarbonisation tech typically first seen at base-metal or gold sites.

    Within the 1515 tag-matched pieces on Projects/Sustainability/Product, UK-based mine power projects are a small subset, suggesting Cornwood could become a reference site for permitting and grid-integration approaches for other British operations looking at on-site storage rather than grid-only solutions.

    For Sibelco, integrating RheEnergise’s long-duration storage at a UK kaolin asset may help hedge against the UK’s volatile power pricing, a recurring concern in our database for energy-intensive mineral processors operating in regions with constrained grid capacity.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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