In 2020, the largest thermal energy storage (TES) facility in Finland was put into operation in Vaskiluoto, Vaasa. It will diversify the region’s thermal energy generation both now and in the future. The power plant will carry out charging, and heat will be discharged from the TES system to be used in the region’s district heating network. The caverns used for thermal energy storage will act as an optimisation tool within EPV’s energy generation portfolio. The total volume of the TES facility is 210,000 m3 and it will have a charging and discharging capacity of 100 MW.