Elioth is responsible for the facade design engineering for this a 220-metre high office tower with the mission of designing facades and optimising the integration of  studying photovoltaic panels. The project is located in the Rose de Cherbourg district of La Défense. The Hekla Tower rises to 51 levels from the ground floor. The body of the building is in the first approach triangular in shape and spans the existing circular road. The overall envelope of the tower covers an area of approximately 43,000 m². The levels of the tower are intended to be occupied mainly by offices. Common and reception areas, restaurants and an auditorium are available on the first 7 levels of the tower.