Our hydropower plants
We own a total of eight hydropower plants and are the co-owners of four more. They are located along the Iijoki, Kemijoki, Kokemäenjoki and Tengeliönjoki rivers.
Haapakoski
Haapakoski hydropower plant is located along the Iijoki river, Oulu region in Northern Finland.
| Completed | 1963 |
| Modernised | 2007-2009, 2024-2025 (turbine) |
| Electrical power | 32,6 MW |
| Ownership | PVO-Vesivoima Oy (Pohjolan Voima Oyj 100 %) |
Harjavalta
Harjavalta hydropower plant is located along the Kokemäenjoki river in Western Finland.
| Completed | 1939 |
| Electrical power | 105 MW |
| Ownership | Länsi-Suomen Voima Oy – UPM 51,1 % – PVO-Vesivoima Oy 19,9 % – Kolsin Vesivoimatuotanto 13,2 % – City of Pori 12,8 % – Pori Energy 3,0 % |
Isohaara
Isohaara hydropower plant is located along the Kemijoki river, Oulu region in Northern Finland.
| Completed | 1949, 1993 |
| Modernised | 2016-2017 (automation) |
| Electrical power | 112,5 MW |
| Ownership | PVO-Vesivoima Oy (Pohjolan Voima Oyj 100 %) |
Jolmankoski
Jolmankoski hydropower plant is located along the Tengeliönjoki river in Northern Finland.
| Completed | 1955 |
| Electrical power | 0,5 MW |
| Ownership | Tornionlaakson Voima – Pohjolan Voima Oyj 50 % – Tornionlaakson Sähkö Oy 50 % |
Jumisko
Jumisko hydropower plant is located in Kemijärvi region in Northern Finland.
| Completed | 1954 |
| Modernised | 2021 |
| Electrical power | 27,8 MW |
| Ownership | PVO-Vesivoima Oy (Pohjolan Voima Oyj 100 %) |
Kaaranneskoski
Kaaranneskoski hydropower plant is located along the Tengeliönjoki river in Northern Finland.
| Completed | 1954 |
| Electrical power | 3 MW |
| Ownership | Tornionlaakson Voima – Pohjolan Voima Oyj 50 % – Tornionlaakson Sähkö Oy 50 % |
Kierikki
Kierikki hydropower plant is located along the Iijoki river, Oulu region in Northern Finland.
| Completed | 1965 |
| Modernised | 2005-2007 |
| Electrical power | 37,5 MW |
| Ownership | PVO-Vesivoima Oy (Pohjolan Voima Oyj 100 %) |
Maalismaa
Maalismaa hydropower plant is located along the Iijoki river, Oulu region in Northern Finland.
| Completed | 1967 |
| Modernised | 2009-2011 |
| Electrical power | 38,6 MW |
| Ownership | PVO-Vesivoima Oy (Pohjolan Voima Oyj 100 %) |
Melo
Melo hydropower plant is located along the Kokemäenjoki river in Central Finland.
| Completed | 1971 |
| Modernised | 1998-1999 (turbines), 2014-2015 (generators), 2025 (turbines) |
| Electrical power | 67,9 MW |
| Ownership | PVO-Vesivoima Oy (Pohjolan Voima Oyj 100 %) |
Pahkakoski
Pahkakoski hydropower plant is located along the Iijoki river, Oulu region in Northern Finland.
| Completed | 1961 |
| Modernised | 2011-2013 |
| Electrical power | 42,4 MW |
| Ownership | PVO-Vesivoima Oy (Pohjolan Voima Oyj 100 %) |
Portimokoski
Portimokoski hydropower plant is located along the Tengeliönjoki river in Northern Finland.
| Completed | 1987 |
| Electrical power | 10,5 MW |
| Ownership | Tornionlaakson Voima – Pohjolan Voima Oyj 50 % – Tornionlaakson Sähkö Oy 50 % |
Raasakka
Raasakka hydropower plant is located along the Iijoki river, Oulu region in Northern Finland.
| Completed | 1971, 1997 |
| Modernised | 2018 (electricity, automation) |
| Electrical power | 64,3 MW |
| Ownership | PVO-Vesivoima Oy (Pohjolan Voima Oyj 100 %) |