Greater Paris: Clemessy designs and builds the monitoring and control equipment for the Thermal Smart Grid of the Plateau de Saclay


In charge of developing the Plateau de Saclay as an international research and innovation centre, the Paris Saclay Local Planning and Development Agency (EPAPS) has signed a Design, Building, Operation and Maintenance (DBOM) contract with the IDEX - EGIS consortium for a period of seven years. These two companies have undertaken to create an urban heating and cooling network on two joint development zones (ZAC) and have chosen Clemessy to design and build the monitoring and control equipment for the Thermal Smart Grid which will control all the installations implemented on the two ZACs.

Unlike usual urban heating and cooling networks, the Plateau de Saclay network has one decentralized production model per district and a centralized additional heating and cooling supply. Each ZAC therefore has two geothermal boreholes (i.e. a doublet) made in the Albian groundwater table (approximately 30°C). The new thermal network proposed by the consortium will be fully incorporated into the future Paris Saclay Smart Energy Programme (led by the EPAPS).

The monitoring & control system which Clemessy has to design and build must allow all the installations’ operating information to be grouped together and make it possible to send the start, stop or control set-points to the equipment in order to supply heating and cooling to each customer according to their needs.
The part of this DBOM contract which Clemessy is responsible for also includes the creation of a fiber optic network to connect all the installations belonging to the urban network.

In each of the installations (power plants, islands and substations), a PLC will ensure local control. Linked together by the fiber optic network, these PLCs will communicate with the centralized supervision system. This supervision system will monitor and manage the facilities, but it will also handle data management and information exchange with the EPAPS and IDEX Decision Support System (DSS).

Our personnel will therefore carry out the commissioning of two thermal plants (or centralised heating and cooling production equipment) and seven island production substations. At the same time, our teams in charge of fiber optics will run 14 km of networks, marked by 55 substations which they will also put into service.

In total, the project will feed 2,100 student lodgings, 2,400 family housing units, as well as higher education institutions and public facilities over an area of 520,000 m².

Plateau de Saclay, view of the polytechnic school future district

Plateau de Saclay, view of the polytechnic school future district