Power plants

ON Power owns and operates three power plants: the Nesjavellir and Hellisheiði Geothermal Plants and the Andakílsárvirkjun hydroelectric station. The combined output of our operations is 450 MW of electrical power and 1,100 of thermal power. 

Learn more on http://onpower.is/about-us 

Nesjavellir Geothermal Plant

Nesjavellir geothermal plant generates electricity and hot water by utilizing geothermal water and steam. The plant output is 120 MWe and 300 MWt/1800 litres per second. 

Exploration and planning for utilization started as early as 1947 and was continued for two years. A few experimental boreholes were drilled for the evaluation of the exploitable power and the chemical composition of the steam.  Following a time of intermission, exploration and research continued with some regularity from 1965 to 1986. The construction of the geothermal power station was started in 1987 and completed in 1990.

Like the rest of the Hengill area, Nesjavellir is popular for recreational activities. Reykjavik Energy has organised the outdoors areas of its land there, marking hiking and riding trails. Archaeological finds and other historical cultural artifacts have been registered, a total of 375 sites at Nesjavellir and Ölfusvatn. Two hikers' shelters, open to everyone, have been built in the Hengill area.

Hellisheiði Geothermal Plant

Hellisheiði Geothermal Plant is situated at the Hengill area, an active volcanic ridge in SW Iceland.  The plant´s purpose is to meet increasing demand for electricity and hot water for space heating in the industrial and domestic sectors.   Production capacity is 303 MW electricity and 133 MW thermal energy.

Geothermal activity in the Hengill area is connected with three volcanic systems.  At least three volcanic eruptions have occurred in the Hengill area in the last 11,000 years, the most recent being 2,000 years ago.  The Hengill area is part of the Hengill region, which covers 112 square kilometers and is one of the most extensive geothermal areas in Iceland.

Production Cycle

Click here to see the Hellisheiði Geothermal Plant Production Cycle

Geothermal Energy Exhibition

A geothermal energy exhibition is on display at the Hellisheiði Plant´s visitors centre.