IEEE Spectrum – Energy

This High-Density Hydro Storage System Ditches the Water

UK‑based RheEnergise has demonstrated a water‑free pumped‑storage system that uses a proprietary High‑Density Fluid, 2.5 times denser than water, to generate 500 kW in a pilot plant. The closed‑loop design replaces traditional reservoirs with a concrete lower tank and an 80‑metre high reservoir, allowing operation on modest slopes. The company plans modular 5‑MW turbines for commercial plants delivering 10‑20 MW by 2028, targeting utilities and independent power producers. This approach could unlock pumped‑hydro storage in locations previously unsuitable for conventional projects.