Kemijoki Oy has a 60-year experience in the building, use, maintenance and capacity increases of hydropower plants. We own 20 hydropower plants in total, 16 of which are located at the Kemijoki watercourse area. In addition, we also have two power plants at River Lieksanjoki and two at River Kymijoki. We also regulate the storage reservoirs in Lokka and Porttipahta as well as Lake Kemijärvi and Lake Olkkajärvi.
In 2018, we produced a total of 4,501 GWh of electricity. The total output of our power plants is over 1,100 MW. The river’s natural conditions during different seasons of the year are the most important factor affecting the planning of hydropower production. In addition to the natural conditions, the planning involves taking account of the consumption of energy and the many users of the river, for example bobbers, fishermen and boaters.
The hydropower plants in the drainage area of River Kemijoki are mainly located on River Kemijoki and River Kitinen. The term drainage area refers to the area from which rain water drains into River Kemijoki and finally into the Gulf of Bothnia. Therefore, it is natural that the largest power plants measured by the volume of water are located on the section of Kemijoki’s main river bed below Rovaniemi. The seven power plants at Kemijoki’s main river bed are among the 10 largest hydropower plants in Finland.
In recent years, we have invested in increases of the hydropower plants’ capacity. The capacity increases improve the efficiency and permeability of the turbines, which also increases the maximum power. As a result of the increased efficiency, more energy can be produced from the same amount of water outside flood season. Increased permeability results in more energy during flood seasons, and the need for diversion is reduced. In addition, oil will be replaced with water as a lubricant for the runner hubs of the turbines, reducing the risk of oil spills significantly.
The first power plant built by Kemijoki Oy, Petäjäskoski, is currently the second largest hydropower plant in Finland. It was built in 1957. The newest power plant, Kelukoski power plant, was built in 2001.
|Power plant||Build in||head m||output nominal value MW||Annual energy (net) GWh (average water)||The average flow rate (MQ) M3/S||discharge m3/s|
|Kemijoki watercourse area|
|Lieksanjoki power plants|
|Kymijoki power plants|
|ALL IN TOTAL||1157||4476|