Energy Dome and its carbon dioxide batteries

Energy Dome stores electricity as compressed carbon dioxide: when power is cheap, compressors turn the gas into a liquid and keep the heat that produces; when demand rises, the gas expands through a turbine. Its first commercial plant, in Sardinia, opened in 2025 at 200 megawatt-hours, and the company says it is about 10 to 15 percent cheaper than lithium-ion for eight-hour storage.

Summary written with AI by HowTechMoves, based on reporting by MIT Technology Review.