RheEnergise Energy Storage

RheEnergise is a European clean-energy company headquartered in London, with a wholly owned subsidiary in Montreal. It develops High-Density Hydro®, a long-duration energy storage solution designed to support reliable electricity grids and integrate more renewable power. The technology uses a high-density fluid to deliver 2.

5 times the power of conventional pumped hydro, according to the company, and is intended to work in locations where legacy hydropower may not be viable, including sites with limited water availability. RheEnergise positions its solution as low-cost and globally scalable, using established industries and existing supply chains rather than building factories. In January 2026, its first project became operational, generating full power and completing consistent cycles; the company says this has reduced key technology risks as it prepares for commercial-scale deployment.

Its prospective customers include renewable energy developers, independent power producers, infrastructure operators and utilities. Target applications include mines, data centres, co-located solar and wind projects, and island grids