heating of the Piscine du Remblai and 17 buildings

After the Passage district, trenches were born all over the city!
Objective: pipes for Thalassothermy.

Initially, the system could benefit 17 public and private buildings in the City of Sables-d’Olonne and could be extended in the future.
Enerplage Les Sables is designed to heat an area estimated at 50,000 m²on the basis of 100Kwh per m² per year.
For example, the Town Hall has a floor area of ​​8,200m².

Depending on the evolution of the gas price, installation will be profitable in only 8 has 12 years.
Above all, this investment allows the Agglomeration to move away from fossil fuels as provided for in the Territorial Climate Air Energy Plan (PCAET), and to control its production locally with a return on investment.

This project will also make it possible to achieve the 2050 objectives which require a reduction of at least 60% in fossil energy consumption.
Thalassothermy will reduce greenhouse gases released by buildings by 60%, i.e. 1000 tonnes less Co2 each year.

Estimated schedule for the first 3 phases of work
Tranche 1 / March to May 2024
Work to create the urban heat network between the Town Hall and the Pierre Mauger college
Creation of a link between the Atlantes and the Grande Plage
During the duration of the work, traffic And THE parking will be adapted.
In order to limit disruption, the work will be carried out in successive sections.

Tranche 2 / mid-November 2024 to mid-January 2025
Installation of the pumping pipe, seawater discharge pipe, and continuation of the heating network.
The work will be carried out in sections of 200m by 30m wide from the foot of the small pier.
The disbursed sand will be used to create a protective merlon.
Each section will be backfilled and rehabilitated before starting the next.
Pedestrians will be able to circulate during the work.

Tranche 3 / January to September 2025
Rue Travot: from mid-January to mid-March 2025
Work will be carried out at both ends of this street. The construction site area will be demarcated by wooden fences.
The street will obviously remain accessible to pedestrians.
Continuing work on the urban heat network: Quai Dingler…


Thalassothermy: heating from the calories of sea water

The sea water captured on the beach by the drains passes through a heat exchanger which transfers its calories into fresh water, without mixing them.
Sea water can be released into the natural environment without any pollution.
Fresh water connected to heat pumps makes it possible to produce the energy which heats a heat transfer fluid used for example for building heating. With 1 KW of electricity, we produce 4.5 KW of heat.
In comparison, an electric heater produces 1 KW of heat with 1 KW of electricity.
Clean, efficient and 100% renewable energy


Sea water at the right temperature in the bay of Sables-d’Olonne

Temperature of the bay of Sables-d’Olonne Vendée

– optimize an already existing technology by making the most of the drains already installed under the Grande Plage
– exceptional funding from ADEME up to 45% of the work.

Philippe Brossard-Lotz

The Sablais Reporter



Enerplage consists of using the water drained on the Grande Plage to supply a heat pump system.
In Sables d’Olonne, the project is to create a large heating network which will initially heat 17 public and private buildings.
This technology called thalassothermy: it is a clean, renewable, local, less impactful energy that replaces gas, an imported and expensive fossil energy. Thalassothermy can power heating, hot water, cooling or air conditioning systems.
A concrete response to achieve the Agglo’s objectives in terms of sustainable development, reductionn greenhouse gases or even the reduction of the depaddiction to fossil fuels imworn.

In Sables d’Olonne, sea ​​water will become a Source of energy, to heat public buildings and homes.
The sea is an immense Source of energy from which Les Sables d’Olonne will benefit by equipping itself with the necessary technologies.
By adapting the existing drainage system on the Grande Plage, an autonomous heating system – thalassothermy – will be created in Les Sables-d’Olonne for numerous buildings in the city center.

An energy own, renewable, local Who will feed 17 buildings public And private In A initially then possibly extended later.

Sea base, The Atlanteans, Remblai swimming pool (filtered sea water supply), Foch building, Town Hall, Future media library, Les Salines Building, Perseverance Building, Pierre Mauger College, Garden School, Delegation for the Sea and Coast (DML), ND Bourgenay College, Saint-Elme School, Sainte-Abbaye Museum Cross, Marais Marine Conservatory, Sub-prefecture, EHPAD Les Genêts d’Or.
Or 50,000 m2 heated per year, in 17 buildings powered 80% by thalassothermy.
The central boiler room will be installed in Atlantes. With 4 heat pumps.

The specific case of the Piscine du Remblai

Remblai swimming pool: filtered water supply and heating – Les Sables-d’Olonne Vendée


Eco beach

A system which rejects the pumped water towards the sea, but pumped water which can be used for other activities such as thalassothermy.

Ecoplage was installed in 1999 in Les Sables d’Olonne, from a system of drains under the beach, parallel to the coastline and connected to a pumping station.
Drainage dries the foreshore, slows beach erosion and facilitates re-silting at the end of winter.

Ecoplage drains located on the beach of Sables-d’Olonne Vendée


Thalassothermal work Les Sables-d’Olonne Vendée

ADEME GRANT: €3,789,000
(heat fund)

The purpose of the Heat Fund is to encourage the replacement of installations consuming fossil fuels by the installation of renewable heat and cold production equipment using biomass, geothermal energy, solar energy, biogas and recovery energies, coupled with heat and cold networks. It is intended for collective housing, communities and businesses.

45% of Tranche 1 and Tranche 2, i.e. €3,789,000 of a total of €8,420,000 excluding tax

– Tranche 1 – €6,878,000 excluding tax
– construction of the heating network for 10 buildings
– construction of the heat pump / connections of the 10 buildings

– Tranche 2 – €1,542,000 excluding tax
– extension of the heating network for 7 additional buildings

Total Tranche 1 and Tranche 2 = €8,420,000 excluding tax

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