Fenno‑Skan 3 is a planned HVDC subsea interconnector jointly developed by the Finnish and Swedish transmission system operators Fingrid and Svenska kraftnät. It is conceived as a replacement for the ageing Fenno‑Skan 1 link and is intended to increase cross‑border transmission capacity between Fi...
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On 20 May 2025, Fingrid and Svenska kraftnät signed a Letter of Intent agreeing to launch the planning of the third submarine cable connection between Finland and Sweden, Fenno-Skan 3, with an estimated capacity of 800 MW. Under this agreement the TSOs initiated the formal planning process for the new HVDC interconnector, which is intended to replace Fenno-Skan 1 in the late 2030s and raise total cross-border capacity between the countries to about 1,600 MW.
On 25 April 2019, Fingrid and Svenska kraftnät released the final HVDC capacity study between Finland and Sweden, which re-evaluated two 800 MW HVDC alternatives—Kvarken (SE2–FI) and the SE3–FI "Fenno-Skan" option between Dannebo and Rauma/Lieto—to replace Fenno-Skan 1 around 2029. The study examined technical feasibility, routing, costs and socio-economic benefits, including the possibility of using the decommissioned Fenno-Skan 1 cable as a metallic return path for Fenno-Skan 2, and concluded that both alternatives were broadly feasible and beneficial, with no clear overall ranking between them.
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SE3-FI, FI-SE3, FI_FS, SE3_FS
On 1 November 2016, Svenska kraftnät and Fingrid published a joint cross-border capacity study between Finland and Sweden that analysed options to increase transmission capacity, including an 800 MW SE3–FI HVDC "Fenno-Skan" alternative between Dannebo and Finland intended to replace the ageing Fenno-Skan 1 connection. The study concluded that several AC and HVDC alternatives, including the SE3–FI option, were technically feasible but would require grid reinforcements and further investigation of the most advantageous solutions.
The Fenno-Skan 3 HVDC interconnector between Finland and Sweden was granted Project of Common Interest (PCI) status on the EU’s 2nd PCI/PMI list, recognising it as essential for European energy market integration and EU energy policy objectives of affordable, sustainable and secure energy.
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