GEK Terna Holding Real Estate Construction SA engages in the development and management of investment property, construction of any kind, the management of self-financed or co-financed projects, the construction and, operation of energy projects. The company operates through following segments: Construction; Electricity from Renewable Sources of Energy; Electricity from Thermal Energy Sources & Trading of Electric Energy; Real Estate Development; Industry; Concessions; and Holdings. The Construction segment engages in the construction of technical projects. The Electricity from Renewable Sources of Energy segment engages in the electricity production from wind generators, hydroelectric projects and other renewable energy sources. The Electricity from Thermal Energy Sources & Trading of Electric Energy segment engages in the electricity production using natural gas as fuel, and trading of electric energy. The Real Estate Development segment engages in the purchase, development and management of real estate. The Industry segment engages in the production of quarry products and the exploitation of magnesite quarries. The Concessions segment engages in the construction and operation of infrastructure and other facilities. The Holdings segment engages in the supporting operation of all of the segments of the group. The company was founded by Nikolaos Kampas in 1959 and is headquartered in Athens, Greece.