Google is commissioning the construction of CO2 batteries by Energy Dome in Italy to provide green, reliable backup power for its data centers. These batteries are expected to be 30% cheaper than lithium-ion batteries and have greater capacity and scalability, offering renewable power around the clock. The CO2 batteries can be built quickly and with small footprints, making them a promising solution for large-scale power storage. Energy Dome's expandable dome structure minimizes CO2 release in case of damage, with interest from companies like Alliant Energy in Wisconsin for residential power supply.