A blue-and-white "hill" stood at a factory in Deyang, Southwest China's Sichuan Province. At the foot of the "hill," rows of factories, pipes, and tanks were arranged. Together, they formed a super power bank, the world's first carbon dioxide-flywheel energy storage demonstration project.
Covering an area of 1,800 square meters, the power bank has an energy storage scale of 10 megawatts/20 megawatt-hours. It can store 20,000 kWh of power within two hours, making it the world's largest single-machine and energy storage capacity.
Carbon dioxide energy storage is a kind of compressed gas energy storage that uses carbon dioxide as a cycle fluid for charging and discharging. It's worth noting that no fossil fuel is used during the entire process, and neither solid waste nor carbon dioxide is released, said Wang Xin, deputy general manager of Energy Storage Technology Department of Dongfang Turbine Co., Ltd. Moreover, carbon dioxide is non-toxic, non-flammable, and easy to obtain. It can be liquefied at standard temperature and can be easily stored as a liquid with low storage costs.