ENGIE Solutions to assist development of district heating system in North Vilaine

  • Cities & District Energy News
  • 14 December 2019
  • by ENGIE Solutions

Rennes Métropole has awarded the public service delegation contract for the North Vilaine district heating system to ENGIE Solutions, an 18-year contract that will enable the development of 36 km of networks to provide increasingly virtuous heat throughout the Rennes area. The Rennes Métropole North and East network extension and interconnection project is part of its Territorial Climate, Air and Energy Plan, which aims to increase the region’s energy independence.


To do this, an ambitious network development programme will be rolled out over the next 5 years, in which En’RnoV, the new local subsidiary of ENGIE Solutions is involved. In total, 36 km of networks will be added to the existing 30 km to provide heat, of which more than 68% is produced from local and renewable energy originating primarily from waste (Energy Recovery Unit) and wood (biomass). This will generate savings of 171,000 tonnes of CO2 over the term of the contract.


From 2020, the first phases of work will start with the development of new production means, in particular the creation of a new boiler house near to the CHRU (Regional University Hospital). In addition, operations will also be conducted to optimise the distribution of heat and network safety.


To accompany the extension and the zero carbon transition of the Rennes district heating system, the ENGIE Solutions teams are developing new digital optimisation tools to manage the current equipment and future installations, in particular the 187 new substations (delivery points for the heat) that will be 100 % connected from 2021. In total, more than 54 million euros will be invested to develop the network, including more than 11 million euros of subsidies expected by ADEME and 1.9 million euros expected from Energy Savings Certificates.



From 1 January 2020, En’RnoV, a local subsidiary of the district heating system, is committed to providing energy that is accessible to as many people as possible with the introduction of a single tariff for all current and future subscribers to the North Vilaine network. An innovative system based on the Consomm’Acteurs responsible consumer principle will also be implemented: subscribers with renewable production means will enjoy a green energy buyback tariff that will allow them to reinject the energy produced in their facilities into the district heating system.


Alongside that, with a view to combating fuel poverty, a governance model unique in France will be deployed with local energy associations and Rennes Métropole to help reduce the energy consumption of almost 11,000 homes. The public service delegation contract will also support regional development of the area through 3,000 hours of social integration each year and several partnerships with younger generations designed to encourage mentoring.


The Rennes Métropole North Vilaine district heating system in figures:

• Contract term: 18 years

• +150 GWh, so 304 GWh in the end ;

• +36 km of network, for a total of 66 km ;

• +187 sub-stations, making 408 sub-stations in total ;

• 35,000 equivalent residential units connected

• Districts served: Beauregard, Villejean, Baud-Chardonnet, Gros Chêne, Bourg l’Evesque, Rives de l’Ille, Saint Martin, Maurepas-Gayeulles, Longchamps

• Total investment: €54 M

• 53,300 hours of integration completed

• 68% renewable and recovered energy

• 171,000 tonnes of CO2 avoided over 18 years



ENGIE Solutions

ENGIE Solutions is a brand that groups together ENGIE Ineo, ENGIE Axima, ENGIE Cofely and ENGIE Réseaux.
In France, ENGIE Solutions employs 50,000 people with various skills, capable of working alongside cities and
communities, industry and service sector businesses and providing them with a solution to the energy transition


Factory performance, user comfort and regional appeal are at the heart of the ENGIE Solutions value proposal
with a zero carbon target.



En’RnoV is the public service company for the supply of heat in the Rennes Métropole North Vilaine district
heating system, a subsidiary 100% owned by ENGIE Solutions (ENGIE Group).



ENGIE Solutions press contact:

Karine Patin France

Tel.: +33 (0)2 51 84 73 20

Email: karine.patin@engie.com

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