New CO₂ Battery in Sardinia Stores Renewable Energy for 10 Hours Without Lithium
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📰 The quick summary: A new 20MW/200MWh CO2 Battery in Sardinia, Italy offers 10 hours of continuous energy storage without using rare earth materials, providing a safer and more sustainable alternative for renewable energy dispatch.
📈 One key stat: The CO2 Battery delivers 20MW/200MWh of power with 10 hours of continuous discharge, enabling stored renewable energy to be available during peak demand or overnight.
💬 One key quote: “The CO2 utilized in the cycle gets contained fully and can be reused which means that there are no emissions during the process.”
1️⃣ The big picture: Energy Dome and ENGIE have partnered to create an innovative energy storage solution in Sardinia, Italy that uses compressed carbon dioxide instead of traditional materials. This CO2 Battery system provides 20MW/200MWh of power with 10 hours of continuous discharge capability. Unlike conventional storage technologies, it avoids using rare earth materials, hazardous chemicals, or flammable elements. The system works through a closed-loop thermodynamic cycle where CO2 is compressed, liquefied, stored, and then reversed through turbines to generate electricity when needed.
2️⃣ Why is this good news: This technology eliminates the environmental concerns associated with lithium and other battery types by using only carbon dioxide in a fully contained, emission-free cycle. The system can be installed in regions where traditional energy storage solutions like pumped-hydro are impractical, expanding clean energy possibilities worldwide. By offering 10 hours of continuous discharge, the battery helps solve one of renewable energy’s biggest challenges – providing power when the sun isn’t shining or wind isn’t blowing. The CO2 Battery uses widely available components like turbines and compressors rather than complex manufacturing processes, making it potentially more accessible and scalable globally.
3️⃣ What’s next: Energy Dome plans to replicate this technology in Wisconsin through a partnership with Alliant Energy, with construction scheduled for 2026. The company is accelerating global deployment to support decarbonization efforts worldwide. ENGIE will optimize the battery’s dispatch in Italy’s energy markets to strengthen the country’s renewable energy capacity.
Read the full story here: EcoTicias – 20 MW inside a white dome — Not lithium, not hydrogen and not coal
