The Prysmian Sky Project in Kirkkonumminvolves the construction of a 185‑metre‑high cable tower for Prysmian Group’s submarine cable production facility, making it the tallest building in Finland. The Tower enables the installation of a new, state‑of‑the‑art vertical vulcanization line used in the manufacturing of high‑voltage submarine cables, a critical technology for modern power transmission. The building houses two vertical vulcanization lines and requires exceptional structural stability.
The tower was constructed using slipform casting technology, allowing continuous work around the clock. Construction was heavily influenced by weather conditions, particularly wind speeds, which imposed strict limits on both crane operations and the casting process. The project site was extremely confined within an active factory area, and production at the adjacent facilities continued uninterrupted throughout construction. Successful delivery required close cooperation between the client, the constructor YIT, and multiple partners.
Beyond the cable tower, the investment also included four new hall extensions and a new material storage facility, bringing the total new floor area to approximately 26,000 square metres. The project involved demanding foundation works as well as extensive concrete, steel, and technical building services construction.
Prysmian’s investment in Kirkkonummi supports growing demand for land and submarine power cables driven by the energy transition, particularly projects such as offshore wind farms.
