The idea behind the “CO2 battery” is simple. The goal is to bridge the gap between when renewable energy is available and when it’s actually needed through a “long-term duration energy storage” (LDES) solution. The idea has even caught the attention of Google, which announced a partnership with Energy Dome earlier this year. Unlike other renewable energy storage solutions, CO2 batteries don’t need special minerals, supply chains for complex parts, or constant upkeep. More on renewable energy storage: The Amount of Electricity Generated From Solar Is Suddenly Unbelievable