Local wood for the new biomass plant in Saint-Germain-en-Laye

On Thursday 7 July, Emmanuel Lamy (Mayor of Saint-Germain-en-Laye), Jean-Philippe Buisson (Dalkia Director of the Ile-de-France Region) and Joëlle Colosio (ADEME Director for the Ile-de-France Region) inaugurated the Enerlay biomass heating plant for the district heating network in Saint-Germain-en-Laye. The wood fuel for the new plant is sourced locally, within a radius of 50 km. By using this renewable resource to meet more than 60% of heating and hot-water needs, Dalkia and the local authority have also ensured that users benefit from a reduced VAT rate of 5.5% since April 2015.


The Enerlay heating plant has been supplying the Saint-Germain-en-Laye district heating network since April 2015. It serves the district of Bel-Air and the village of Hennemont through 8.5 km of pipes and will also provide a connection to the new Lisière Pereire eco-district in the near future.

The wood is sourced locally, within a radius of 50 km around Saint-German-en-Laye. Part of that feedstock comes from work carried out in the region's national forest and on private property.

The heating plant is powered solely by wood chips made by crushing wood from tree-trimming and forestry work. Chip production offers a means of recycling branches, damaged wood and small-diameter residues left over after forestry operations to provide timber for construction and industry.

This wood fuel currently meets 60% of heating and hot-water needs for the equivalent of nearly 3,900 households. The 6 MW biomass plant will use 12,500 tonnes of biomass a year.

Using this carbon-neutral energy source will prevent 6,800 tonnes of CO2 emissions every year, which is the equivalent of taking 3,800 cars off the roads.

From an economic standpoint, users also benefit from a reduced VAT rate of 5.5% because the biomass meets more than 60% of energy needs for the district heating network. Moreover, there will be very little fluctuation in energy prices, with local sourcing ensuring stable operating costs in the long term.

Construction of the wood-fired heating plant represents an investment of €5 million for Dalkia subsidiary Enerlay, which will operate the facility for 20 years. The project also qualified as an "investment for the future" under the scheme introduced by the French government, receiving €600,000 in funding from the Ile-de-France regional council and €150,000 from the national environment and energy management agency, ADEME.

Emmanuel Lamy, Mayor of Saint-Germain-en-Laye, is proud of the heating plant performance: " [It] perfectly meets the goal of transforming the current heating network, which was built in 1973. The heating plant covers the equivalent of 33% of households while eliminating CO2 emissions and reducing energy bills for users. The plant is a great example of the local authority’s commitment to state-of-the-art facilities and the highest standards in environmental performance (HQE)."

Jean-Philippe Buisson, Dalkia Director of the Ile-de-France Region: "[I am] proud of the district heating facility, which promotes green growth in the region through the use of a local, renewable energy source".

About Saint-Germain-en-Laye

Saint-Germain-en-Laye is the third-largest municipality in the Ile-de-France region. Two thirds of its area is national forest (3,500 hectares), providing the largest natural park in the Greater Paris area. It offers a number of attractions in terms of heritage, geography, economy and transport, which make it an integral part of the capital's appeal. The Lisière Pereire eco-district on the edge of the forest is due to open in 2017 and reflects the local-authority’s drive to invest in sustainability initiatives. The biomass heating plant, which will also supply the new eco-district, is another key milestone for this sustainable development campaign. More economical, more ecological and more efficient than its predecessors, the plant provides a clear demonstration of the local authority’s commitment to effective facilities that meet the highest environmental quality standards (HQE).

Dalkia: leading energy savings in France

Dalkia, a subsidiary of the EDF group, is one of the leading providers of energy services in France. Dalkia offers its clients tailor-made solutions scaled to fit each building, city, municipality, region and industrial site. Dalkia rises to the challenge of the energy transition and provides its clients with expertise covering the entire energy chain, from energy supply to optimisation of their energy consumption, as well as operation and maintenance of installations. All Dalkia’s solutions are paired with energy efficiency commitments and long-term performance guarantees.

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