Estonia plans 225MW pumped hydro energy storage facility to help disconnect from Russia

LinkedIn
Twitter
Reddit
Facebook
Email

State-owned Estonian energy company Eesti Energia is planning to build a 225MW pumped hydro energy storage facility, as part of a wider push to become independent of Russian energy.

The company has started carrying out preliminary design and environmental impact assessment for the works which could be completed by 2025-26.

This means it could be completed in time for the Baltic region including Estonia’s planned connection to the continental electricity system – and concurrent disconnection from the Russian energy system – in 2026.

The pumped hydro energy storage plant is being planned for the industrial area of a now closed oil shale mine in the northeast county of Ida-Virumaa.

This article requires Premium SubscriptionBasic (FREE) Subscription

Enjoy 12 months of exclusive analysis

Not ready to commit yet?
  • Regular insight and analysis of the industry’s biggest developments
  • In-depth interviews with the industry’s leading figures
  • Annual digital subscription to the PV Tech Power journal
  • Discounts on Solar Media’s portfolio of events, in-person and virtual

Or continue reading this article for free

Eesti Energia said it is not aware of disused mines being used as reservoirs for pumped hydro anywhere else, and that the concept could be exported to countries whose land relief makes conventional pumped hydro energy storage difficult.

The plan, illustrated in the above image, is for the upper reservoir to be built on a tailings dam, an earth-fill embankment used to store byproducts of mining, while the closed mine underground will be used as the lower reservoir.

The Baltic states are currently part of Russia’s electricity system but are seeking to disconnect and synchronise with continental Europe’s through a connector between Poland and Lithuania, the Harmony Link project.

Lithuania is also undertaking large energy storage projects as part of this move, in its case building a 200MW, one-hour battery energy storage system (BESS) provided by Fluence. Poland, meanwhile, is building a 200MW/820MWh BESS which will aid the planned synchronisation of the regions, the state-owned company behind the project has said.

Looking elsewhere, the pumped hydro energy storage space has seen a few substantial large-scale projects commissioned recently. Although small in number compared to BESS units, the size of the projects means each one has a huge impact on the local grid.

A facility was recently inaugurated in Portugal by utility Iberdrola, whose 1,158MW combined hydroelectric power once fully operational will increase the country’s electrical power capacity by 6%. In Switzerland, a 20GWh system in the Valais mountains also recently came online.

Read Next

September 16, 2025
Ignitis Group and Olana Energy have progressed BESS projects in Lithuania closer to construction, with the order of equipment and final investment decision (FID) taken, respectively.
September 15, 2025
Hithium will supply battery storage and SMA the power conversion systems for a 500MWh grid-forming project in Australia for Fotowatio Renewable Ventures (FRV).
September 12, 2025
Dutch BESS operator Return has acquired four ready-to-build (RTB) projects in Germany, while agrifood tech and renewables investor N2OFF has added BESS to a solar project it is developing there.
September 11, 2025
IPP DTEK Group and system integrator Fluence have together put a 200MW/400MWh BESS portfolio in Ukraine into commercial operation, a milestone praised by the country’s energy minister Svitlana Grinchuk.
September 9, 2025
“The industry has to continue to be aggressive,” says Luigi Resta, president of US renewable energy and energy storage developer rPlus Energies, on the US remaining a competitive market for energy storage.

Most Popular

Email Newsletter