An innovative Australian renewable energy startup is scaling up its cost-effective gravity-based energy storage technology after forming a partnership with a major international engineering services company. Green Gravity will work with global giant GHD to commercialise the application of its system, which revolves around the principles of gravity and kinetic energy – in this case, lowering ultra-heavy weights down old mine shafts – to store and dispatch renewable energy. “Green Gravity’s technology represents a breakthrough in the search for economic long-duration storage of renewable energy,” says the company’s CEO Mark Swinnerton. “By re-using mining assets, costs can be kept low. By using gravity as the fuel, we dispense with consuming the critical water, land and chemicals that other storage technologies rely on.