GEK Terna Holding Real Estate Construction SA engages in the construction, industrial, concessions, real estate and energy sectors. The company operates its business through the following business segments: Construction, Electricity from Renewable Sources of Energy (RES), Electricity from Thermal Energy, Real Estate Development, Industry, Concession, and Holdings. The Construction segment engages in the construction of technical projects. The Electricity from RES segment produces electricity from wind generators and hydroelectric plants. The Electricity from Thermal Energy involves electricity from natural gas. The Real Estate Development purchases, develops, and manages real estate and investments. The Industry segment constructs metal wind generator pylons and wood constructions, and also produces rollers, cement and other inert quarry materials. The Concession segment comprises of the construction and operation of infrastructure. The Holdings segment provides supporting operations to all segments. Its construction activities include infrastructure and building works in the private and public sectors. The company was founded by Nikolaos Kampas in 1959 and is headquartered in Athens, Greece.