GEK Terna Group is one of the leading business groups in Greece with operations also in Central and Southeastern Europe, USA, North Africa and Middle East. The group’s expertise spans from construction, energy production and supply, concessions, waste management and mining activities to real estate development and management.

With a total number of 6,000 employees around the world, the group has made investments of more than €1.5 billion in the last five years. The current construction backlog of the group reaches €1.8 billion while the total installed capacity of the energy plants that the group owns or participates in exceeds 1,500 MW.

The group's subsidiaries include construction firm Terna S.A., renewable energy developer Terna Energy S.A., mining and magnesia production firm Terna Mag S.A. and facilities management firm GEK services. The group also have a controlling stake alongside GDF Suez Group and Qatar Petroleum Group in HERON group, a thermal energy developer.