Estonia to host 550 MW pumped hydro storage facility

Estonia to host 550 MW pumped hydro storage facility


Energiasalv has secured a construction permit to build a 6 GWh pumped hydro storage plant in Paldiski. Work on the facility is planned to start in the summer of 2024.

European Network of Transmission System Operators (Entso-E). The company conducted then the environmental assessment and environmental studies between 2016 and 2018, with the geological investigations having been done between 2019 and 2021.

The storage facility is planned to have a storage capacity of 6 GWh during one storage cycle of 12 hours.

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According to Entso-E, the project is based on a semi-loop concept, with the upper reservoir being the Finnish Gulf hosting sea water with very low salinity and the lower reservoir being a cavern in depth of -550m in the granite body. “It consists of an underground reservoir in crystal underground rock, chafers connecting it to the ground and to the seabed, and other land-based objects,” the company explained.

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The commissioning of the facility is scheduled for 2029. The project originally received funding of €650 million, as an EU Project of Common Interest.

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