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Litgrid issues HVDC cable tender for Harmony Link [free access]

August 18, 2021

The Lithuanian electricity transmission system operator (TSO), Litgrid, has announced that it would be purchasing a 700 MW high voltage direct current (HVDC) cable for the Harmony Link project.


The tender requires the contractor to design, supply, construct and commission an HVDC cable system that will connect the Zarnowiec substation in the Pomeranian region of Poland with the Darb─Śnai substation in the Kretinga district of Lithuania. The contract is expected to be signed in 2022, and majority of the cable construction work will be carried out from 2023 to 2025.


The Harmony Link interconnector will facilitate the exchange of electrical energy between the Polish and Lithuanian electricity networks, helping to improve the security of supply between the two countries. The project comprises 290-340 km of subsea cable route section and 20 km underground cable routes in Poland and Lithuania, with HVDC voltage source converter (VSC) stations at both ends of the cable system. The Link would entail an investment of EUR680 million, of which EUR493 million will consist of the maximum possible support from the Connecting Europe Facility (CEF). Preparatory work for the connection is underway with a route study prepared in the Baltic Sea, while contracts for the connection and targeted consultations have also been signed. Presently, a seabed survey and spatial planning procedures are underway.  


The Harmony Link connection, which is the largest synchronisation programme project of the Baltic states, is one of the 14 projects, approved by the Lithuanian government which include the extension of the existing LitPol Link connection by adapting it to work in synchronous mode, installation of three synchronous compensators, strengthening of internal networks and improvement of system management and IT.


To qualify for the 700 MW cable requirement, the supplier must have manufactured at least one HVDC cable system covering both undersea and underground sections, and installed at least one HVDC submarine cable of 50 km or longer in the last 8 years. In addition, the supplier must have successfully completed prequalification and type-tests for 320 kV or more submarine cables, and should have an average annual total operating income of at least EUR170 million over the last 3 years or from the date of registration.


The last date for the submission of bids is September 30, 2021.