Green Gravity

Green Gravity develops gravitational energy storage systems that use disused mine shafts to store and release renewable energy by raising and lowering heavy weights, capturing and releasing gravitational potential energy on demand. The technology addresses the intermittency challenge of renewable energy—where wind and solar produce when conditions are favorable rather than when demand calls—by providing flexible storage that can deliver short or mid-duration discharge and grid ancillary services. Green Gravity's system is circular (reusing abandoned mine infrastructure), sustainable (low noise, small land footprint, no water or chemicals, fully recyclable unlike batteries), locally sourced (materials, supply chain, and workforce from the local community), low-cost (reuse of infrastructure, high efficiency, low O&M costs), and long-lived (no degradation, avoiding the costly performance decline of battery systems). The company has secured binding agreements for deployment trials including the Russell Vale mine with Wollongong Resources, signed an MoU with IIT (ISM) Dhanbad's TEXMiN to assess gravitational energy storage in India's underground mines, and won the Clean Technology Impact award at the 2025 NSW Sustainability Awards. Founded in 2021 and headquartered in Wollongong, Australia, the company has raised approximately $7.4 million at the Series A stage from investors including HMC Capital, BlueScopeX, Pacific Channel, and Prospect Innovation.

Renewable Energy Tech > Horizontal > Energy Storage > Gravity,

Energy Storage Tech > Energy Storage System > Flywheel