Our Staff

Our friendly staff is at hand to guide you through the exhibition.  We are pleased to have an energetic workforce, dedicated to providing excellent service, answering questions from our guests and conveying knowledge about geothermal energy in Iceland.

ON Power Owns and Operates the Geothermal Exhibition

100% Green and Sustainable Energy 

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.

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In Harmony with the Nature and the Ecosystem

​​​​​​​Respecting the nature, social responsibility and quality customer service are the backbone of our business.


About Hellisheiði Power Plant

Thanks to its position on a volatile section of the Mid-Atlantic ridge, Iceland is a world leader in the use of geothermal energy.  

Of the six geothermal power plants in Iceland, Hellisheiði (pronounced “het-li-shay-thee”) is the newest and largest. Hellisheiði Power Plant is situated in the Hengill area in South West Iceland and provides electricity and hot water for space heating in the industrial and domestic sectors in Iceland.

To access the potential energy under the surface, wells are drilled thousands of metres into the ground, penetrating reservoirs of pressurised water. Heated by the Earth’s energy, this water can be more than 300°C in temperature, and when released it boils up from the well, turning partly to steam on its way. At Hellisheiði, the steam is separated from the water to power some of the plant’s seven turbines, while the remaining water is further depressurised to create more steam, used to power other turbines. At its maximum output the station can produce 303MW of electricity, making it one of the largest single unit power plants in the world.


About Hengill, Volcanic Mountain, Area

The area of the impressive volcanic mountain Hengill is one of the largest geothermal areas in Iceland, covering of approximately 100 km². The geothermal activity is connected with three volcanic systems and at least three volcanic eruptions have occurred in the last 11,000 years, the most recent being 2,000 years ago. Two power stations derive its energy from Hengill, Hellisheiði power plant and Nesjavellir power plant.

  • Nesjavellir plant generates electricity and hot water by utilizing geothermal water and steam. Production capacity is 120 MW of electricity and 300 MW of thermal energy (1800 litres per second). Nesjavellir geothermal power plant is not open to the public.
  • Hellisheiði Power Plant production capacity is 303 MW of electricity and 133 MW of thermal energy. The thermal energy capacity could be increased by 300MW. You can visit the Geothermal Energy Exhibition at Hellisheiði Power Plant.

Hiking in the Area

Diverse landscape and popular among locals
The Hengill area is an ideal recreational area that can be enjoyed the year round.  If offers most of the features of Iceland’s natural beauty; interesting landscapes, geothermal areas with hot springs and craters, diverse vegetation, rivers and lakes.  
Marked hiking routes
Hiking trails, with a combined length of over 100 km can be explored.  A distinction is made between the different hiking trails, identified in the terrain with yellow wooden stakes with varying colours on top.

We recommend combining hiking experience and visit to the Geothermal Exhibition and Café Energy. 

Hiking map (pdf)

The Architecture of the Building

Largest Single Site Geothermal Power Plant in the World
The construction of Hellisheiði Power Plant started in 2005 and the first phase of the plant went online in 2006. When designing the plant, flexibility was very important. The goal was to have all plant components in one central building with each production unit located around the main structure.

Ideology of the Building
The form of the building is derived from the geology of Iceland, where the strata tilt into the boundaries between the tectonic plates in the centre of the island. The visitor’s centre and the turbine halls incline against each other as a reflection on these tectonic forces, which are the source of the energy that powers the plant. The “spear” above the guest entrance has a visual connection to another energy centre, of a more spiritual level; the Snæfellsjökull glacier, which is also Jules Verne’s entrance to the Centre of the Earth. Landscape architecture is used to emphasize sustainable solutions in a respectful dialogue between nature and culture.