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Mitsui & Co. Global Strategic Studies Institute Monthly Report February 2021 GLOBAL EXAMPLES OF THERMAL HEAT STORAGE DEVELOPMENT Thermal heat storage using igneous rock:Siemens Gamesa The thermal heat storage under development by Siemens Gamesa generates power stored as heat in crushed igneous rock as shown in Figure 4. The company operates a demonstration plant in Germany, which is capable of heating approximately 1,000 tons of crushed igneous rock to 480°C and storing the heat for 24 hours (Figure 8). Power is supplied using a 1.5MW steam turbine, and the overall efficiency of converting electricity into heat and then back to electricity is 25%. In the future, the goal is to increase the heat storage temperature to 600- 700°C to achieve overall power generation efficiency of 45%. The system is made using existing technologies and inexpensive materials, such as using an industrial heater for electrothermal conversion, using inexpensive igneous rock as the heat storage material, and generating power with a proven steam turbine. For this reason, facility cost can be kept to one tenth that of batteries, according to Siemens Gamesa. In the future, after verification in a 30MW pilot plant with five times the heat storage scale, the company plans to build a commercial plant capable of storing approximately 100MW in around 2025. 5PDF Image | THERMAL ENERGY STORAGE DEVELOPING FOR A DECARBONIZED SOCIETY
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