Energy Vault Holdings, Inc. and Carbosulcis S.p.A. are set to develop a groundbreaking 100 megawatt (MW) Hybrid Gravity Energy Storage System at Italy’s largest former coal mining site in Sardinia. This ambitious project aims to transform the retired coal mine into a cutting-edge Renewable Energy Technology Hub, enhancing Sardinia’s green energy capabilities and supporting local economic revitalisation.

The new energy storage system will utilise Energy Vault’s innovative EV0 modular pumped hydro gravity storage technology, combined with lithium-ion batteries. This hybrid energy storage system, powered by VaultOS energy management software, will be deployed within 500-meter-deep shafts at the former coal mine owned by the Sardinia Regional Government. The project, following a land lease agreement signed in July 2024, marks a significant step towards Sardinia’s goal of converting the site into a hub for carbon-free technology.

Hybrid Energy Storage Technology for a Sustainable Future

Energy Vault’s Advanced Satellite Dispenser represents a significant upgrade over the company’s previous Canisterized Satellite Dispenser technology. The ASD’s unique combination of modular gravity storage and battery technology aims to optimise energy storage and deployment in the deep mine shafts, making full use of the site’s geological features. This hybrid solution leverages traditional pumped hydro technology alongside Energy Vault’s cutting-edge gravity storage technology, providing a versatile and efficient energy storage system.

Francesco Lippi, Chief Executive Officer of Carbosulcis, expressed enthusiasm for the project, noting that the innovative hybrid energy storage solution will not only support the conversion of the coal mine into a technology hub but also enhance the stability of Sardinia’s power grid. Lippi highlighted the project’s potential to maximise the use of renewable energy and contribute to the island’s “smart transition” towards a carbon-free future.

Impact on Sardinia and Beyond

The Hybrid Energy Storage System will play a crucial role in stabilising Sardinia’s power grid by providing reliable storage for renewable energy and addressing peak load demands. This initiative will also support the local economy by fostering new industrial and technological activities in the area. With the mine set to retire by the end of 2026, the Sardinia Regional Government aims to repurpose the site with minimal environmental impact, aiding the economic transition from coal production.

Marco Terruzin, Chief Commercial and Product Officer at Energy Vault, highlighted the significance of the project, emphasizing the potential for the hybrid energy storage system to revolutionise energy storage solutions globally. Terruzin noted that this project exemplifies Energy Vault’s commitment to exploring innovative uses for its technology, with applications ranging from renewable energy support on islands to large-scale grid stabilisation worldwide.

The partnership between Energy Vault and Carbosulcis marks a pivotal moment in the transition to renewable energy. By repurposing a major coal mining site for advanced energy storage, this project not only supports Sardinia’s green energy goals but also sets a precedent for similar initiatives globally. The hybrid energy storage system’s ability to integrate traditional and cutting-edge technologies reflects a growing trend towards more adaptable and efficient energy solutions.

  Carbosulcis S.p.A., Energy Vault Holdings, EV0 modular pumped hydro, hybrid energy storage system, Inc., Renewable Energy Technology Hub, Sardinia, VaultOS