HS Orka hf owns and runs two power plants which produce electrical energy, heating district water and distilled water with subterranean steam
Svartsengi began electrical power production in 1976 with subterranean steam, becoming the first power plant in the country to combine electrical power production and energy development for home heating. The plant was built in six phases and the largest phase, the fifth, was completed by 1999 with a 30 MW machine along with a thermal energy plant capable of producing 240 liters of hot water per second. In December 2007 the sixth phase was taken into use, Energy Plant 6. It only produces electrical power, generating 33 MW. The total power generated when all phases were completed was 75 MW. Part of this electrical energy produced, around 27,6 MW, goes to Norðurál in Hvalfirði.
Reykjanesvirkjun began electrical energy production into the distribution system of the country in May 2006. The total power generated by the plant today is around 100 MW, and the power for the plant is taken from 12 boreholes of the 15 that have been drilled in the surrounding area. Subterranean steam has been utilized for the industry and electrical power production in Reykjanes for a sustained period of time thus immense knowledge about it has been unlocked, but the steam utilized is very mineral rich and causes a lot of precipitation Almost all of the production of the plant is sold to Norðurál in Hvalfirði.