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.
In conclusion, these studies indicate that high VRES shares in the Finnish energy system are possible, but require measures such as energy storage and demand response for their successful integration. 3.
There has especially been growth in utility-scale battery energy storage systems, with about 0.2 GWh currently in operation and a further 0.4 GWh planned. A similar growth in thermal energy storage systems, with about 39 GWh in operation and a further 176 GWh under planning, has been reported.
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.
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