News article


Hydropower renovation programme on the River Iijoki brought more output and environmental benefits

The renovation works at the Pahkakoski hydropower plant were completed on schedule before the spring floods. The Pahkakoski renovation was the last one in the Iijoki hydropower plant renovation programme initiated in 2005. The renovation programme brought more capacity to four plants and environmental benefits.

The renovated Pahkakoski machine was started successfully slightly ahead of schedule. The renovation of the machine 2 was started in November 2012. The renovation of the machine 1 was completed a year before, in the spring 2012. The renovation included refurbishment of the turbine and the stators of the generator, an overhaul of the generator rotor, as well as modernization of electricity and automation systems.

Pohjolan Voima started its extensive hydropower renovation programme in 2005 on the River Iijoki at the Kierikki power plant. Since then, the renovation programme has included the Haapakoski, Maalismaa and Pahkakoski hydropower plants, all originally completed in the 1960s. The newest hydropower plant on the River Iijoki, Raasakka, will be renovated later on. The Raasakka power plant was originally completed in 1971 and enlarged in 1997.

More hydropower capacity well suited for balancing power as well as environmental benefits

The Iijoki hydropower plant renovation programme has increased hydropower capacity. This new capacity is renewable and well suited for balancing power. Thanks to the renovation programme, the capacity of the renovated power plants increased by 20 megawatts.

-       With the hydropower renovation programme we have been able to increase the capacity and efficiency of our power plants. The plants generate approximately 20 gigawatthours of more electricity with domestic, renewable hydropower that is well suited for balancing power. However, flood waters will still have to be let past the power plants. After the technical renovations, significantly more of the energy in the river water could only be utilized if the flood waters were stored, states Managing Director Pertti Pietinen of PVO-Vesivoima Oy, the hydropower company of Pohjolan Voima.

The technology modernised in the renovation brings forth environmental benefits as well. Water has replaces oil as the lubricant used in the impeller, thus effectually removing the risk for oil leaks.

Hydropower renovation will continue at the Melo power plant on the River Kokemäenjoki

The renovation of Pohjolan Voima's hydropower plants will continue at the Melo power plant on the River Kokemäenjoki. The Melo plant will be renovated in 2014 and 2015. The renovation will include the refurbishment of generator stators and the modernisation of the electricity and automation systems. The generator will be delivered by Koncar GIM from Croatia in co-operation with Multirel Oy. The electricity and automation systems supplier is Vaasa Engineering Oy. The Melo power plant, originally completed in 1971, underwent an earlier renovation in 1999.

In addition, the electricity and automation systems of the Portimokoski power plant, an associated plant on the River Tengeliönjoki, will be modernized in the first part of 2014. The supplier is Vaasa Engineering. The Portimokoski power plant was completed in 1987.

For further information, please contact:
Managing Director Pertti Pietinen, PVO-Vesivoima Oy, tel. +358 40 581 4726
Manager, Operation and Management, Juha Kähkölä, PVO-Vesivoima Oy, tel. +358 50 3038 622