The Nesjavellir Geothermal Power Station (, ) is the second-largest geothermal power station in Iceland. The facility is located above sea level in the southwestern part of the country, near Þingvellir National Park and the Hengill mountain range, about 30 km east of central Reykjavík. The power station is owned and operated by ON Power. Plans for utilizing the Nesjavellir area for geothermal power and water heating began in 1947, when boreholes were drilled to evaluate the area's potential for power generation. Research continued from 1965 to 1986. In 1987, construction of the plant began, and the cornerstone was laid in May 1990. The station produces approximately 120 MW of electrical power; it also delivers around of hot water per second - with a heating capacity of 150 MWt, serving the space heating and hot water needs of the Capital Region. See also Geothermal electricity Geothermal power in Iceland List of largest power stations in the world Renewable energy in Iceland External links ON Power: Our power plants Buildings and structures completed in 1990 Geothermal power stations in Iceland 1990 establishments in Iceland