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Energy Dome and its carbon dioxide batteries

Casey Crownhart· 6 octobre 2026

There’s a growing need for long-duration storage to meet energy demand and balance out renewables on the grid. Energy Dome uses compressed carbon dioxide gas in its massive grid batteries, which can deliver power for up to 24 hours. As the world races to meet growing electricity demand, solar and o…

Résumé

Rising need for storage

The global push for renewable energy sources like solar and onshore wind power has created a challenge: these energy sources are intermittent, meaning their output fluctuates depending on weather conditions such as sunlight or wind availability.

This intermittency disrupts the balance between energy supply and demand on the electrical grid.

To address this issue, long-duration energy storage solutions are becoming essential.

These systems store excess energy generated during peak production times and release it when demand is high or production is low.

Energy Dome, a company founded in 2020 and based in Milan, Italy, has developed a technology to meet this need by using compressed carbon dioxide (CO₂) to store energy for up to 24 hours, smoothing out the gaps in renewable energy supply.

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