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Hepokorpi Electricity Substation

A new large-scale substation consisting of 400 kV and 110 kV gas-insulated switchgear systems (GIS), two 400 kV transformers, and three landscape pylons. It is located at the intersection of a popular outdoor recreational area and the Kehä III ring road.

When finished, the Hepokorpi substation will be the first building of its type in Finland to feature a mass timber frame in the main GIS halls. High-quality in-situ concrete structures complement this.

The wooded setting inspired the exterior architecture, with the ceramic facade cladding referencing the colours and topography of the context.

The hyperbolic structures of the landscape pylons are a part of the mathematical landscape of the power lines crossing the site. Their spatial form strives for unity with the abstract architecture of the new buildings.

Completion: 2025
Client: Fingrid Oyj
Location: Espoo, Finland