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.

Completed1963
Modernised2007-2009
Electrical power32,6 MW
OwnershipPVO-Vesivoima Oy
(Pohjolan Voima Oyj 100 %)
Street AddressVoimatie 23, 91100 Ii

Harjavalta

Harjavalta hydropower plant is located along the Kokemäenjoki river in Western Finland.

Completed1939
Electrical power105 MW
OwnershipLänsi-Suomen Voima Oy
– UPM 51,1 %
– PVO-Vesivoima Oy 19,9 %
– Kolsin Vesivoimatuotanto 13,2 %
– City of Pori 12,8 %
– Pori Energy 3,0 %
Street AddressVoimalaitoksentie 70, 29200 Harjavalta

Isohaara

Isohaara hydropower plant is located along the Kemijoki river, Oulu region in Northern Finland.

Completed1949, 1993
Modernised2016-2017 (automation)
Electrical power112,5 MW
OwnershipPVO-Vesivoima Oy
(Pohjolan Voima Oyj 100 %)
Street AddressTorniontie 1, 94450 Keminmaa

Jolmankoski

Jolmankoski hydropower plant is located along the Tengeliönjoki river in Northern Finland.

Completed1955
Electrical power0,5 MW
OwnershipTornionlaakson Voima
– Pohjolan Voima Oyj 50 %
– Tornionlaakson Sähkö Oy 50 %
Street AddressJolmankoski, 97250 Raanujärvi

Jumisko

Jumisko hydropower plant is located in Kemijärvi region in Northern Finland.

Completed1954
Modernised2021
Electrical power27,8 MW
OwnershipPVO-Vesivoima Oy
(Pohjolan Voima Oyj 100 %)
Street AddressVoimalaitoksentie 25, 98420 Ryti-Lehtola

Kaaranneskoski

Kaaranneskoski hydropower plant is located along the Tengeliönjoki river in Northern Finland.

Completed1954
Electrical power3 MW
OwnershipTornionlaakson Voima
– Pohjolan Voima Oyj 50 %
– Tornionlaakson Sähkö Oy 50 %
Street AddressKaaranneskoskentie, 95780 Sirkka

Kierikki

Kierikki hydropower plant is located along the Iijoki river, Oulu region in Northern Finland.

Completed1965
Modernised 2005-2007
Electrical power37,5 MW
OwnershipPVO-Vesivoima Oy
(Pohjolan Voima Oyj 100 %)
Street AddressKierikintie 63, 91200 Yli-Ii

Maalismaa

Maalismaa hydropower plant is located along the Iijoki river, Oulu region in Northern Finland.

Completed1967
Modernised 2009-2011
Electrical power38,6 MW
OwnershipPVO-Vesivoima Oy
(Pohjolan Voima Oyj 100 %)
Street AddressMaalismaantie 1629, 91200 Yli-Ii

Melo

Melo hydropower plant is located along the Kokemäenjoki river in Central Finland.

Completed1971
Modernised 1998-1999 (turbines), 2014-2015 (generators)
Electrical power67,9 MW
OwnershipPVO-Vesivoima Oy
(Pohjolan Voima Oyj 100 %)
Street AddressMelontie 121, 37140 Nokia

Pahkakoski

Pahkakoski hydropower plant is located along the Iijoki river, Oulu region in Northern Finland.

Completed1961
Modernised 2011-2013
Electrical power42,4 MW
OwnershipPVO-Vesivoima Oy
(Pohjolan Voima Oyj 100 %)
Street AddressKottarantie 37, 91260 Pahkakoski

Portimokoski

Portimokoski hydropower plant is located along the Tengeliönjoki river in Northern Finland.

Completed1987
Electrical power10,5 MW
OwnershipTornionlaakson Voima
– Pohjolan Voima Oyj 50 %
– Tornionlaakson Sähkö Oy 50 %
Street AddressMuurolantie 116, 95620 Aavasaksa

Raasakka

Raasakka hydropower plant is located along the Iijoki river, Oulu region in Northern Finland.

Completed1971, 1997
Modernised 2018 (electricity, automation)
Electrical power64,3 MW
OwnershipPVO-Vesivoima Oy
(Pohjolan Voima Oyj 100 %)
Street AddressVoimatie 23, 91100 Ii