【Voice_over】 China has connected its first 100 megawatt-class compressed CO2 energy storage facility in northwestern China's Xinjiang Uygur Autonomous Region to the grid. The facility acts like a massive battery-with five gas holders, 141 liquid storage units and 97 thermal storage units working together to compress carbon dioxide gas into a liquid during low electricity demand and expanding it back into a gas to drive a turbine when demand peaks. The plant is unlike typical pumped-hydro or compressed-air energy storage systems because its closed loop technology doesn't rely on a change in elevation. 【Sound_bite】 Ma Guojiang, leader, carbon dioxide energy storage project： "Compressed carbon dioxide has a higher energy density and offers numerous advantages, including high efficiency, low cost, high safety, and zero pollution. The project's designed efficiency makes it the most efficient carbon dioxide power generation unit in China today." 【Voice_over】 The project's leader says after it finished, the plant is expected to generate about 200 million kilowatt hours of electricity annually which will reduce CO2 emissions by 170,000 tons. [Restrictions: No access Chinese mainland]