Utilitas is building a 1100 MWh heat storage facility in the Väo energy complex in Tallinn, which will enable to harmonize daily energy production, increase the security of supply of the district heating system and reduce the use of fossil fuels.
The capacity of the heat storage facility to be completed is 80 MW, it is 42 meters high and has a diameter of 26 meters. This allows it to store 20,000 cubic meters of water, which is equivalent to the capacity of nearly eight full-size Olympic pools. “The introduction of a heat storage facility will help to increase the share of heat produced from renewable energy in Tallinn’s district heating network and reduce dependence on imported fuels,” said Priit Koit, CEO of the Utilitas Group.
According to Koit, the storage system will increase the security of supply of the entire district heating system and enable the harmonization of daily energy production, thereby helping to further increase the efficiency of the district heating system. “This is especially important in the spring-autumn periods, when daily temperatures fluctuate a lot. In this way, it is possible to store the necessary heat in advance and avoid gas consumption. We can also partially cover the energy needs in the evening and during the morning peak hours with the help of heat storage,” he explained.
The construction of heat storage facility began in August 2024 and it will be connected to the district heating network in October this year. Today, the storage tank has reached its peak height, and in the near future it will be closed and the tank will be filled with water. After that, the tank is covered with a 40 cm thick layer of insulation and exterior finishing.The heat storage facility is being built by Swedish company Granitor Rodoverken AB.
The total cost of the heat storage facility amounts to 8 million euros. The project is co-financed by the Environmental Investment Centre with 675,000 euros from the funds of the European Union’s recovery instrument NextGenerationEU.
The Väo energy complex in Tallinn produces green energy from two high-efficiency combined heat and power plants, a heat pump plant and two solar parks. Soon Utilitas will also open Estonia’s first green hydrogen production unit and a filling station at Väo.
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