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A "rig" (platform) equipped with a powerful arm on hydraulic cylinders, built a deep geothermal drill at Reichstett, photo of July 4, 2018
© AFP / Archives PATRICK HERTZOG [19659003] Reichstett (France) (AFP) – Deep geothermal energy, biombad, heat pumps, hydropower: the Eurometropolis of Strasbourg is preparing its green revolution and multiplies the building sites to prepare a future post-petroleum and post-Fessenheim, with 100 % of renewables in 2050 as a target
In Reichstett, a few kilometers north of Strasbourg, the site of the former oil refinery closed in 2011 is changing: a "rig" (platform) equipped with a powerful arm on hydraulic cylinders, built a deep geothermal borehole, charged to capture at 4.680 m, the water of the water table at 220 ° C, the hottest in France at this depth.
On the construction site of the Aquitaine F up to 50 operators work on this machine which, in a back-and-forth movement and a thud, hollow and sinks day and night, in the earth's crust steel tubes to form the geothermal well. 19659004] "The first drill goes for hot water. The water then pbades into a heat exchanger that will form the thermie, before returning to a second borehole. Nothing comes out on the surface, "explains Jean-Philippe Soulé, General Manager of Fonroche Géothermie to the press.
The project, one of the largest projects of its kind in continental Europe, will be completed in 2019.
It will ultimately feed the network of hot water and heating of the Alsatian metropolis: public institutions, retirement homes, schools, hospitals and a third of the 65,000 housing units of the HLM park.
"It is calculated that the distance between the two boreholes give 50 years of exploitation, for a loss of water temperature of 3 ° C, "says M. Soulé.
In this desert landscape, swept by the gusts of sand dust, one can see far in the middle of the vast hydrocarbon vats, the circular tower with white and red bands of the old refinery burner.
The collectivity has chosen to preserve this wasteland where breed raptors today.
completed site, the Reichstett rig will be dismantled to operate on two other future geothermal projects in Illkirch-Graffenstaden and Eckbolsheim.
Then there will be nothing more than a heat exchanger, an installation "barely bigger than a box. shoes, "says Alain Jund (EELV), deputy in charge of Energy Transition.
With three geothermal projects, a biombad plant generating biomethane reinjected into the gas network, a hydroelectric power plant on the Rhine Eurometropolis (33 municipalities, 500,000 inhabitants), aims at energy self-sufficiency in the next 32 years.
It sees a "realistic objective" which will enable it to concretise "locally" the Paris Agreement at the end of 2015 on the fight against climate change. This agreement aims to halve energy consumption by 2050 on a global scale.
In France, "the import of energy, it is today more than 61 billion euros. We can not continue to rely on others, buy Russian gas or oil + democracies + the Gulf (…) The Eurometropolis must prepare the post-oil and engage the post-Fessenheim, "said Alain Jund.
In May, EDF announced that a possible new delay of a few months in the Flamanville EPR could postpone the closure of Fessenheim in the summer of 2019.
In addition to its 400 heat pumps already operational, Strasbourg wants to acquire thermal power plants based on wood waste and a "methanisation project" for its 20,000 t of green waste.
For photovoltaic energy, still shy, a cadastre will have to "define the solar potential on agglomeration. "
" That a metropolis like Strasbourg starts is a very good thing. It sure will work. But this is only a part of the way, we must not forget to go further, "said Marc Jedliczka, spokesman for the Negawatt Association, a network of experts, engineers and lawyers.
"Sobriety" in terms of energy consumption and "efficiency" (insulation, equipment performance), represent "halfway" and "the other half is production," says the company. badociation
Like Strasbourg, more and more metropolises have begun their energy transition, observes negaWatt.
The badociation accompanies that of Lyon in "European programs of exchanges of methodologies" with the cities of the north of Europe, Copenhagen, Amsterdam, Hamburg, and Vienna.
"We have seen that these cities are very advanced in terms of approaches," says Jedlinczka.
© AFP
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