The Helsinki 400 kilovolt power cable connection
| Project details | ||
|---|---|---|
| Project type: | Cable | |
| Project state: | Building | |
| Location: | Helsinki | |
| Length: | 12 kilometres | |
In close cooperation with the City of Helsinki and Helen Sähköverkko, Fingrid is implementing a new 400 kilovolt cable connection to the main grid to Helsinki to meet the growing electricity consumption in the capital region and promote the green transition. The project planning began in 2020, and the connection will be completed in spring 2027. Preparatory works for a potential second cable connection will continue in the Kivikko area until the end of 2027.
By clicking the photo, you can view the route from Fingrid's map service.
Project status
The project is currently in the building phase from the Länsisalmi substation in Vantaa to the new Vanhakaupunki substation in the Viikinranta energy block in Helsinki.
Current News 2026
The commissioning of the HKI400 cable connection has been postponed until spring 2027 because the long rock drilling operations in section H, beneath the culturally and historically significant area of Kivikko Forest, have faced unexpected challenges. Each additional change in working methods has taken time and extended the schedule. Once the drilling has been successfully completed in early 2027, conduits for the cables and the remaining joint bays will be installed. The 400-kilovolt cables will then be installed and jointed. Preparatory works for a potential second cable connection will continue in the Kivikko area until the end of 2027. We apologise for the inconvenience caused, particularly to people in the Kivikko area.
Current News 2025
Permits to start constructions works were obtained in February for the area of Hallainvuori and Kivikko forest. The construction work has begun with the removal of trees in the expropriation area of the cable route.
In addition, rock drilling under Kivikko's cultural-historical area was started in February.
News 2024
Timetables of the construction site areas (in Finnish). The timetables are preliminary and may change from those announced.
News 2023
In December, tree removal began on the expropriationed cable route and in the construction site areas. The tree removal will continue in the spring of 2024. The marking of the area will be done by Mitta Oy and the tree removal will be carried out by Kone-ja Metsäpalvelu Saarenpää Oy.
EXACT AIP-Mittaus Oy has been selected as the cable route measurement consultant in December.
Demir Kablo, Turkey, has been selected as the supplier of the 400 kilovolt cable in December.
The town plan of Viikinranta's energy block (Vanhankaupunki substation) became legally binding on November 6.
Fingrid received an expropriation permit decision regarding the cable route's lead area from the National Land Survey of Finland on November 1. (MML Decision 20030/03 04/2023). The takeover meeting was held on 27.11.
GRK Suomi Oy was selected as the contractor for the other building blocks of the cable route in November.
Lännen Alituspalvelu Oy has been selected as the contractor for the cable route's horizontal drillings in October.
Hyosung Heavy Industries Corporation, South Korea, has been selected as the supplier of the 400 kilovolt reactor of Länsisalmi substation in October.
Tamini Trasformatori S.r.l., Italy has been selected as the supplier of the power transformer in Vanhakaupunki.
Hitachi Energy Finland Oy has been selected as the substation contractor for Vanhakaupunki and Länsisalmi in October.
A-Insinöörit Suunnittelu Oy has been selected for the construction design of the Vanhakaupinki and Länsisalmi substations in October.
News 2022
In December 2022, Fingrid decided to invest more than EUR 100 million in the construction of the cable connection.
Energy Authority has granted (16.5.) Fingrid Oyj a project permit for the construction of a 400 kV power line between Helsinki and Vantaa (decision Dnro 1222/040101/2022).
The tentative route of the new underground cable has been decided. Based on surveys and negotiations with authorities, the planners consider the best option to be a route through areas owned by the cities, from the Viikinranta energy block via Viikki’s fields, Hallainvuori, Ring I and the Kivikko Sports Park to Länsisalmi. The final route of the underground cable will be specified during the construction planning phase to be launched this year. For more information: Report on the planning phase (in Finnish)
Press release: Fingrid chooses tentative route for Helsinki’s new underground cable
The field surveys of the project will start on 28 March 2022 from the Viikinranta energy block area. The field surveys will continue until the end of June 2022.
News 2021
On 25 November 2021, the National Land Survey of Finland granted Fingrid Oyj a research permit for field surveys in the areas of Helsinki and Vantaa (decision MML 72172/03). The research permit applies to all alternative cable routes.
The participation and evaluation plan for the Viikinranta energy block land use plan was available on the City of Helsinki's website until 18 June 2021.
Ramboll Finland Oy has been chosen in May 2021 as the consulting company used for the general planning.
Parviainen Arkkitehdit Oy has been chosen in April 2021 for substation architectural and structural planning.
- Press Release 22.1.2024: Construction of a main grid cable link in Helsinki to begin this spring
- Press Release 29.5.2023: Helsinki cable project enters implementation phase
- Press Release, 21.12.2022: Fingrid confirms its investment decision in the Helsinki metropolitan area – cable connection to provide more electricity as consumption rises
- Article in Figrid-Magazine 21.11.2022: Twice as much electricity will soon be transmitted in Helsinki
- Press Release, 11.4.2022: Fingrid chooses tentative route for Helsinki’s new underground cable
Fingrid Oyj
Risto Ryynänen
Project Director
tel. +358 30 395 5219
Jussi Rantanen
Project Manager (cable connection)
tel. +358 30 395 5274
Jarmo Henttinen
Project Manager (substations)
tel.+358 30 395 4280
Joonas Hurtta
Project Engineer
tel. +358 30 395 4297
Lotta Hakanpää
Communications Specialist
tel. +358 30 395 5365
e-mail addresses: firstname.lastname@fingrid.fi
General planning and construction management consulting company Ramboll Finland Oy
Jari Heikkilä
Construction Consultant
tel. +35840 725 2673