About Us


ON Power Company Profile

ON Power is a leading power company that produces electricity, mainly by harnessing geothermal energy, to more than half of the population of Iceland. The company is a world leader in the utilisation of geothermal energy, and produces electricity and geothermal water for heating.

Renewable power sources account for more than 70% of the total primary energy consumption in Iceland, far higher than anywhere else in the world. Our district heating utility is the largest geothermal district heating utility in the world.

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. The utilisation of renewable energy resources has enabled Iceland to reach its 20/20/20 target, set by the EU. Almost all the electricity in Iceland is produced with renewable energy resources. ON Power actively pursues social responsibility in its activities and is engaged in extensive innovation on environmentally sound energy production

An interactive presentation of the Hellisheiði Plant Production Cycle

Hellisheiði Geothermal Plant

Hellisheiði Geothermal Plant is situated in the Hengill area in SW Iceland and provides 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 system 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 system is part of the wider Hengill region, which covers 112 square kilometers and is one of the most extensive geothermal areas in Iceland.

The Geothermal Energy Exhibition at Hellisheiði Power Plant

The geothermal energy exhibition is a state-of-the-art look into the harnessing of geothermal energy in Iceland.

Learn more about the energy exhibition

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 liters per second.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 and boasts an outdoors area with marked hiking and riding trails. Archaeological finds and other historical cultural artifacts have been registered at a total of 375 sites at Nesjavellir and Ölfusvatn. Two hikers' shelters, open to everyone have been built in the Hengill area.

100% Green and Sustainable Energy