Paljassaare Seawater Heat Pump and Pumping Station

Client: AS Utilitas Tallinna Soojus

Contract period: May 2025 – December 2025

Contract value: EUR 23 500 000 (ex-VAT)

Capacity Information:

On May 22, 2025, AS Utilitas Tallinna Soojus and KMG Infra OÜ signed a contract for the design, general and specialized construction works, and project management of the Paljassaare wastewater and seawater heat pump plant and the seawater pumping station. This contract is part of the major development project of AS Utilitas Tallinna Soojus.

Under this contract, the following will be constructed:

Paljassaare põik 14 – Heat Pump Plant:

    • The heat pump plant will provide an energy-efficient and environmentally friendly district heating solution.
    • It will use natural sources (treated wastewater and seawater) for heat production.
    • The facility will consist of two tall machine halls, with a three-story section containing technical rooms between them.
    • The northwest part of the building will include a basement level (approx. 7 meters underground) housing a seawater reservoir and technical rooms.
    • The building will be constructed on pile foundations.

    Paljassaare tee 1 – Seawater Pumping Station:

    • A seawater intake filtering system and pumping station.
    • The facility will use seawater as an energy input source, allowing for the stabilization of input flow rates and increasing heat output.
    • The building will consist of one underground level (approx. 9 meters deep) and one above-ground level (with parapet height approx. 9 meters above ground).
    • The structure will also be built on pile foundations.

    Specialized construction works include:

    • Technological piping and equipment
    • HVAC
    • Electrical works
    • Low-voltage systems
    • Commissioning and testing of the station

    The technological portion of the pump stations, including procurement and installation of pipes and equipment, will be carried out by KE Infra.

    Additional Information: 

    Utilitas is building Estonia’s first large-scale heat pump plant in Paljassaare, Tallinn, that produces thermal energy from treated wastewater and seawater. The 110 MW capacity plant will begin supplying heat to the district heating network in 2026.

    This emission-free heat pump plant will use the thermal energy extracted from purified wastewater and seawater, upgrading it to district heating temperatures using green electricity. The integration of Tallinn Water’s Paljassaare wastewater treatment plant, seawater, heat pumps, and the district heating system is an innovative and environmentally sustainable solution being introduced in Estonia for the first time.

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