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The Helsinki 400 kilovolt power cable connection

Project status

The project is currently in the general planning phase. A tentative route for Helsinki’s new underground cable has been selected in March 2022. You will find more information about the project and the selected route in the section"General planning of the power cable connection" in the left navigation menu. 

Project background

The City of Helsinki, Helen Electricity Network Ltd and Fingrid Oyj (the parties) have jointly investigated the overall technical solution in the electricity distribution grid and main grid required for the realization of Western boulevard city. From an overall economic point of view, a joint solution between the three operators is the most profitable option.

An agreement on general planning between the parties was signed in December 2020. The agreement initiates the general planning phase of the project, which will specify the technical design, costs and schedule of all parties.

Within the general planning phase, it is the responsibility of Fingrid Oyj to perform the general planning for a new 400 kilovolt power cable connection between Länsisalmi in Vantaa and Viikinmäki in Helsinki. This new power cable connection will enable the City of Helsinki to release land for the construction of Western boulevard city. The new power cable connection will strengthen Helsinki’s electric grid and support the carbon neutrality goals of Helsinki and Helen Ltd. It will contribute to the transition to carbon-neutral energy generation by 2030.

Project schedule

The aim is that Fingrid's general plans will be ready for the parties' final investment decisions in 2022 and Fingrid will construct the 400 kV cable connection from Länsisalmi to Viikinmäki to the new Vanhakaupunki transformer substation tentatively by the end of 2026.