Architect
Onni Tarjanne Eino Pitkänen
Completion
1917
Renovation
1940
Category
Industrial buildings
Tags
Functionalism hydropower industry Jugend – Art Nouveau Modernism power plant
More

Built in 1917, architect Onni Tarjanne

Renovation and extension in 1940, architect Eino Pitkänen

Cultural Heritage of Hydropower Architecture (VekuVaku) project co-financed by EU Interreg Nord programme

Ämmäkoski is one of the three hydroelectric power plants in the city of Kajaani. It is located in the River Kajaanijoki that flows through the city center. Ämmäkoski is located right below Koivukoski I-II. Between the two power plants lie ruins of the medieval castle of Kajaani.

Ämmänkoski was originally constructed in 1917 and was designed by architect Onni Tarjanne in cooperation with hydropower engineer Hugo Malmi. The power house has an in-situ concrete frame and plastered brick cladding. Ämmäkoski was built to produce power for Kajaani’s industry that was located along the river and Petäisenniska area.

In 1940 Ämmäkoski was completely renovated. Architect Eino Pitkänen also designed an extension for the building. At the same time the facility’s appearance was re-styled in line with the principles of Functionalism. Tarjanne’s original vision with Art Nouveau -esque motives can still be seen in the interior.

A third turbine was also added and today the power plant produces 4.9 megawatts of electricity. The newer Kaplan -turbine was renovated in 2008. The two older Francis -turbines function now as a backup machinery. The city’s business district, also designed by Pitkänen, is located right next to the power plant. It was built according to functionalist planning principles during the economic boom of 1940s and 50s.

Text: Samuli Paitsola

Location

Brahenkatu 7, Kajaani
64.2294945, 27.7293625

Images

View from the direction of the ruined castle of Kajaani in 2019, Ämmäkoski Hydropower Plant
View from the direction of the ruined castle of Kajaani in 2019, Ämmäkoski Hydropower Plant (© Council of Oulu Region / Pekka Elomaa)
View the north in 2019, Ämmäkoski Hydropower Plant
View the north in 2019, Ämmäkoski Hydropower Plant (© Council of Oulu Region / Pekka Elomaa)
View from the direction of the ruined castle of Kajaani in 2019, Ämmäkoski Hydropower Plant
View from the direction of the ruined castle of Kajaani in 2019, Ämmäkoski Hydropower Plant (© Council of Oulu Region / Pekka Elomaa)
Old control gates in 2019, Ämmäkoski Hydropower Plant
Old control gates in 2019, Ämmäkoski Hydropower Plant (© Council of Oulu Region / Pekka Elomaa)
Machine hall in 2021, Ämmäkoski Hydropower Plant
Machine hall in 2021, Ämmäkoski Hydropower Plant (© Council of Oulu Region / Pekka Elomaa)
Old machine hall windows in 2019, Ämmäkoski Hydropower Plant
Old machine hall windows in 2019, Ämmäkoski Hydropower Plant (© Council of Oulu Region / Pekka Elomaa)
Old machine hall windows in 2019, Ämmäkoski Hydropower Plant
Old machine hall windows in 2019, Ämmäkoski Hydropower Plant (© Council of Oulu Region / Pekka Elomaa)
Machine hall, Ämmäkoski Hydropower Plant
Machine hall, Ämmäkoski Hydropower Plant (© Council of Oulu Region / Pekka Elomaa)
Spillwather gates in 2019, Ämmäkoski Hydropower Plant
Spillwather gates in 2019, Ämmäkoski Hydropower Plant (© Council of Oulu Region / Pekka Elomaa)
Painting by Hugo Malmi in 1916, Ämmäkoski Hydropower Plant
Painting by Hugo Malmi in 1916, Ämmäkoski Hydropower Plant (© Council of Oulu Region / Hugo Pekka Elomaa)
Position map in 1916, Ämmäkoski Hydropower Plant
Position map in 1916, Ämmäkoski Hydropower Plant (© Kainuun Voima Oy)
Sections and floor plans, Ämmäkoski Hydropower Plant
Sections and floor plans, Ämmäkoski Hydropower Plant (© Kainuun Voima Oy)

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