This Hybrid Energy Storage solution leverages Energy Vault EV0? gravity technology through a new water-based, modular pumped hydro application. The proposed system combines long-established pumped hydro energy storage technology with Energy Vault’s innovative gravity energy storage technology, allowing the partners to repurpose the unique underground features of the site as a retired coal mine. The Hybrid Energy Storage solution is designed to optimize and fully capitalize on the specific topology of the site and the 500-meter-deep mine shafts, highlighting the unique proposition of Energy Vault as a fully integrated and diversified provider of tailor-made energy storage solutions. The parties recently executed a land lease agreement, with installation of the first modular gravity components set to commence in September 2024 with the testing of the underground component of the Hybrid Energy Storage System expected to be completed in 2025.
Carbosulcis’ Nuraxi Figus site, located on the island of Sardinia in Italy, is currently set to be retired by the end of 2026, and the Sardinia Regional Government aims to convert the site into Technology Hub with a minimum environmental impact which will help the industrial and economic reconversion of an area heavily affected by the exit from coal production. In addition, the Hybrid Energy Storage System will help to stabilize the island’s power grid, with plans to dispatch renewable energy to help meet the high demand during peak load hours while encouraging further local use of renewable generation in Sardinia. The proposed site would be wholly owned and operated by Energy Vault, demonstrating the Company’s commitment to serving as a long-term partner in the region.
"We are very excited about the innovative energy storage combined solution proposed by Energy Vault, including underground gravity energy storage technology, that we are testing together and that can become one of the solutions to support our project to convert our mine into a new Technology Hub. This project will maximize the local use of renewable energy, and at the same time provide services that will improve the stability of the power grid in Sardinia," said Francesco Lippi, Chief Executive Officer (Amministratore Unico), Carbosulcis. "We are deeply appreciative of the partnership that Energy Vault has demonstrated thus far, and their customer-centric approach to the design of energy storage solutions has already proved extremely valuable. Energy storage is a critical component to better utilizing renewable energy around-the-clock on the island of Sardinia. We see this important collaboration with Energy Vault as a vital step in the development of the Technology Hub, which is intended to promote innovation, by recovering a former mining site and strengthening the concept of "smart transition" to renewable energy in an area like the Sulcis Inglesientes heavily affected by the exit from fossil fuels, like coal."
"We are proud to collaborate with Carbosulcis for such an important project. The conversion of the coal mine in Nuraxi Figus to a Technology Hub powered by renewable energy will help the Sardinia region to economically revitalize one of its areas most affected by the exit from fossil fuels. We believe that this exciting application of our energy storage solutions, including a new use for our gravity energy storage technology – deploying it underground – could hold vast potential for future applications," said Marco Terruzin, Chief Commercial and Product Officer, Energy Vault. "Discovering and researching new uses of our technology demonstrates the broad versatility and potential of our unique and innovative portfolio of energy storage solutions. We see a future where our technology helps power the world with renewables. Whether it’s on an island in Italy, by a wind farm near Shanghai, China, providing back-up power for a town in California, or supporting the grid in Texas, Energy Vault’s technology is actively being deployed in a wide range of commercial applications and geographies around the world."
EV0? is part of Energy Vault’s G-VAULT? Gravity Energy Storage System (GESS) portfolio and was announced in May 2024 along with other new gravity storage system products. The new design is a water and vessel-based "modular pumped hydro" solution that is uniquely addressing applications for underground deep mine shafts, in this case a 500-meter-deep shaft at one of the largest coal mines in Italy, which is now under closure. The mine with reserves amounting to 2.5 billion tons of sub-bituminous coal, used to be one of the largest coal mines of its kind in Europe and the world. This is the second deployment of a hybrid energy storage system by Energy Vault after the Calistoga PG&E project in northern California, the largest green microgrid in the world, which pairs green hydrogen with lithium-ion batteries.
About Energy Vault
Energy Vault? develops and deploys utility-scale energy storage solutions designed to transform the world's approach to sustainable energy storage. The Company's comprehensive offerings include proprietary gravity-based storage, battery storage, and green hydrogen energy storage technologies. Each storage solution is supported by the Company’s hardware technology-agnostic energy management system software and integration platform. Unique to the industry, Energy Vault’s innovative technology portfolio delivers customized short-and-long-duration energy storage solutions to help utilities, independent power producers, and large industrial energy users significantly reduce levelized energy costs while maintaining power reliability. Utilizing eco-friendly materials with the ability to integrate waste materials for beneficial reuse, Energy Vault’s G-VAULT? gravity-based energy storage technology is facilitating the shift to a circular economy while accelerating the global clean energy transition for its customers. Please visit www.energyvault.com for more information.
About Carbosulcis
Carbosulcis SpA is a company fully owned by the Autonomous Region of Sardinia. Since 2014 the company has been active in the Closure Plan for coal extraction activities. Nevertheless, the Company inherited impressive infrastructures that were used to support the original mining activity, such as industrial assets and buildings for a volume of more than 200,000 m3, distributed on an area of above 200 hectares, between the Seruci and the Nuraxi Figus sites, in addition to a network of underground tunnels for about 15 km at a depth that varies between 350 and 500 m below ground which can be accessed through 4 vertical mine shafts with a depth up to 500 m and also through an inclined shaft, designed as a vehicle tunnel consisting of three sections of over 1 km each.
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