How electro thermal energy storage could redefine sector coupling

(1/2) Gaseous carbon dioxide enters the heat exchanger on the cold side of the system where it condenses because of the cold from the ice-storage tank. The ice in the tank melts. (3) The pump increases the pressure of the carbon dioxide again. (4/5) The carbon dioxide passes through the heat exchanger and is heated by the water in the hot-water storage tanks. (6) The heated pressurised carbon dioxide is fed into the expansion turbine where it is converted back into electrical energy via a coupled generator. The electricity flows into the grid and is distributed to consumers (Credit: MAN Energy Solutions)