Polar Night Energy plans second pilot sand-battery
Polar Night Energy will build a second pilot plant in southern Finland to test its power-to-heat-to-power sand battery technology. The
Currently, utility-scale energy storage technologies that have been commissioned in Finland are limited to BESS (lithium-ion batteries) and TES, mainly TTES and Cavern Thermal Energy Storages (CTES) connected to DH systems.
Water TTESs found in Finland are listed in Table 7. The total storage capacity of the TTES in operation is about 11.4 GWh, and the storage capacity of the TTES under planning is about 4.2 GWh. Table 7. Water tank thermal energy storages in Finland. The Pori TTES will be used for both heat and cold storage.
Examples of larger GWh-scale borehole thermal energy storages built in Finland include one built at a logistics center in Sipoo and an underground parking lot in Turku . Normally, the depth of the boreholes for ground-source heating and in borehole thermal energy storages is a few hundred meters at most.
Cavern thermal energy storage In Finland, three CTES have been built, and at least four are being planned. These CTES are listed in Table 9. The combined storage capacity of the commissioned CTES is about 27.6 GWh, and those under construction and under planning have a storage capacity of about 112 GWh.
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