27.6.2024 13:52
Press Releases, Projects

Main grid substation to be expanded in Tammisto

The Tammisto substation in Vantaa plays a key role in electricity transmission in the capital region. The transmission system operator Fingrid will build a third transformer for the substation to enable the development of the capital region grid and the electrification of heating.

The main grid substation in Tammisto, Vantaa will be expanded with a new 400/110-kilovolt main transformer. In addition, the substation will be extended and voltage support for the power grid will be stepped up. The project will be completed in late 2026.

The new transformer will increase electricity transmission capacity in the capital region and support the replacement of incineration-based heat generation with zero-emission solutions. This will safeguard the system security of the power grid throughout the capital region. Transformers are used to transfer electricity from the 400-kilovolt main grid transmission links to distribution system operators at a lower voltage level.

Decisions to invest in numerous electric boilers have been made in the capital region. According to forecasts, electricity transmission requirements to the capital region will increase manyfold in the near future due to the phasing out of traditional incineration-based electricity and heat production. In addition to the electrification of heating, other types of electricity consumption are being planned in the region, such as hydrogen production and new data centres.

As part of the development of the capital region grid, Fingrid is also bolstering the power grid with a 400-kilovolt underground cable connection that is currently under construction. The cable connection is scheduled for completion in 2026. It will run from the Vantaa Länsisalmi substation to the new Vanhankaupunki substation in the Viikinranta energy block in Helsinki.

Further information:
Timo Kiiveri, Executive Vice President, Fingrid Oyj, +358 30 395 5136