Energy Vault Holdings, Inc. and Carbosulcis S.p.A. have announced a plan to create a 100MW Hybrid Gravity Energy Storage System at the largest former coal mining site in Sardinia. This system will utilize Energy Vault’s EV0™ modular pumped hydro gravity storage technology combined with lithium-ion batteries, managed by VaultOS™ energy management software.

The project will be deployed in the 500m deep shafts of the former coal mine, owned by the Sardinia Regional Government. A land lease agreement was executed in July 2024, with site testing set to begin in the coming months.

This system aims to boost renewable energy use in Sardinia and contribute to the creation of a Renewable Energy Technology Hub. Energy Vault will own and operate the 100MW storage system.

“This innovative energy storage solution can support our project to convert the mine into a new Technology Hub,” said Francesco Lippi, CEO of Carbosulcis. “This project will maximize local renewable energy use and improve grid stability in Sardinia.”

Marco Terruzin, Chief Commercial and Product Officer of Energy Vault, added: “The conversion of the coal mine to a Technology Hub powered by renewable energy will help economically revitalize the Sardinia region. This application of our technology could hold vast potential for future uses.”

The Hybrid Energy Storage System will stabilize the island’s power grid and support renewable energy dispatch during peak demand. Installation of the first modular gravity components is set to start in September 2024, with underground component testing expected to be completed in 2025.

This project represents a significant step in the transition from coal to renewable energy, aiming to promote innovation and a “smart transition” in an area heavily impacted by the decline of fossil fuels.