Close icon

My notifications

News See all the news
Smart buildings 17/11/2015

Thassalia, the first marine geothermal plant

Located in the heart of Marseille, the Thassalia marine geothermal plant will use the ocean’s geothermal energy to supply heat and cooling to buildings connected to it. In doing so it transforms the Mediterranean into a sustainable source of energy for an area of almost 500,000 m2 of buildings in the Phocaean City.

Thassalia will be the first geothermal power plant in France to operate using salt water, and it will transform the Mediterranean into a sustainable source of energy for an nearly 500,000 m2 of buildings.

The marine geothermal power plant will be situated in the Port of Marseille. A pumping station will draw water from a depth of up to 5 meters, where the water is at a constant temperature. Heat pumps will recover energy from the sea for transfer to the district heating and cooling network. This 3 km-long urban network will cool buildings in summer and warm them in winter. Eventually, the network will service 500,000 m2 of buildings, including the Euromed Center, Les Docks and future Arenc Residential Park.

How does marine geothermal energy production work?

Marine geothermal energy works by making use of the temperature differences between warm surface water and cold water at greater depths, which is pumped through kilometer-long pipelines. Water is pumped into the sea and along the coast, where exchangers and heat pumps regulate production based on heating and cooling needs. The water is then channeled to heat or cool buildings.

With 40% of the population living within 100 km of the coastline, the sea has enormous potential as an energy source in France and around the world. This project highlights the potential of coastal cities in France and around the world to open themselves to the sea as a way to implement the energy transition and benefit both residents and their environment.

Source: ENGIE

Other news of the same theme

Sign up for the ENGIE Innovation Newsletter

Submit your innovative solutions

By continuing to browse, you accept that ENGIE uses cookies for the purpose of saving information about your browsing on the Site. Cookies help make your browsing experience easier and also make it possible to gather statistics about who visits the Site with the goal of improving its quality. For more information, click here.
Consult cookies policy

close icon