Subsidies to improve district heating networks through the CEE

The French energy landscape is rapidly evolving with the rise of district heating networks, key vectors for the energy transition. In the face of climate urgency and regulatory requirements, the establishment and improvement of these infrastructures receive valuable support through Energy Savings Certificates (CEE). These subsidies help reduce the cost of connecting and optimizing networks, facilitating their development and adoption by communities and businesses. Between technical issues, legislative frameworks, and financial opportunities, this detailed focus explains how to make full use of these aids to sustainably transform your collective heating system.

Understanding the operation and benefits of district heating networks: a high-performing solution for the energy transition

A district heating network is a centralized system that supplies heating and hot water to several buildings via a network of water pipes. Unlike each home or building equipped with individual boilers, this system consolidates thermal production in a single boiler room, often powered by renewable or recovered energy sources.

France currently has about 1,000 district heating networks, according to the National Union of Urban Heating, demonstrating their solid foundation in the energy mix. In 2021, more than 62.6% of their energy came from renewable and recovered energy sources (EnR&R), significantly limiting the carbon footprint compared to conventional gas or oil systems.

The technical core is the transfer of heat via a heat transfer fluid circulating through the pipelines, which is delivered to the substations installed in the served buildings. These substations adapt the heat to local demand, supplying radiators, underfloor heating, or water heaters.

Preferred energy sources

• Waste heat: originating from industrial processes or waste incineration, this heat would otherwise be lost.
• Biomass, energy derived from renewable organic materials, supported by operators like Citelum and Dalkia.
• Geothermal energy, capturing the natural heat from the earth to power the network.
• Networks powered by natural gas, often by GRDF, are still present but tend to decline in favor of cleaner energies.

By relying on such sources, the networks limit pollution and provide cost stability over the long term. Centralized management also ensures more rigorous maintenance, mobilizing qualified skills to ensure leakproofing, energy efficiency, and safety.

Main advantages of district heating networks

• Energy savings: pooling and optimizing resources reduces consumption.
• Reduction of polluting emissions, thanks to low-emission solutions and sophisticated filtration systems that eliminate fine particles.
• Adaptability to buildings thanks to substations and local regulations.
• Price stability and predictability of energy costs.

Criterion	Traditional individual boiler	District heating EnR&R
Energy source	Gas, oil, electricity	Biomass, geothermal, waste heat
CO2 emissions	High	Reduced by 50% to 80%
Maintenance	Owner or property manager	Dedicated and specialized professionals
Annual energy cost	Variable, trending upwards	More stable and often decreasing

Thermal networking is part of an energy policy resolutely focused on green growth and overall consumption control. It particularly facilitates the achievement of the sobriety objectives set by the government, including the recent Energy Savings Certificate (CEE) mechanism.

The essential role of Energy Savings Certificates (CEE) in financing district heating projects

CEEs are a state-supported mechanism that encourages economic actors to reduce their energy consumption. Since its implementation, this system has financed a large number of energy efficiency operations, directly including renovation and connection to district heating networks.

The principle is based on an obligation imposed on energy suppliers (EDF, Engie, Veolia, etc.) known as “obliged parties”: they must achieve specific energy-saving targets over a period. To satisfy these targets, they finance energy work for consumers or communities in the form of bonuses.

Simple operation of CEEs

1. An energy-saving project is implemented (e.g.: connection to a district heating network).
2. The volume of saved energy is evaluated in kWh cumac (cumulative and updated over time).
3. This volume generates a certain number of certificates that can be sold or exchanged.
4. The beneficiary receives a financial bonus proportional to the volume of energy saved.

The official site service-public.fr details the conditions for attribution, while Hellio offers personalized support to maximize these aids.

Standardized operation sheets: a structured framework for subsidies

To ensure fair and transparent implementation, the government has created several sheets specifying the volumes of CEEs attributed for each type of work. In 2023, the catalog includes more than 200 sheets, several of which are dedicated to district heating networks.

Sheet	Description	Target public	Examples of applications
BAR-TH-137	Connection to the district heating network for existing residential buildings	Owners, condominium associations	Individual houses, collective housing
BAR-TH-127	Connection to the district heating network for tertiary buildings	Companies, public establishments	Offices, hospitals, shops
RES-CH-107	Insulation of the network’s singular points (valves, substations)	Network managers	Optimization of infrastructure
RES-CH-105	Transition of the network to low temperature	Network operators	Reduction of thermal losses

These references allow for calculating a fixed amount of CEE based on specific parameters, including climatic zone, heated area, and technical power. These criteria ensure aid tailored to local realities and the characteristics of the building or network.

Concrete examples of funding through CEEs

• Connection of a collective building to a low-temperature network in an H2 zone, generating several thousand euros in bonuses.
• Transition from an individual oil appliance to an urban network powered by biomass, with the almost complete coverage of costs.
• Insulation work on substations improving efficiency, financed by a specific bonus dedicated to maintaining and optimizing the existing network.

For more information on amounts and conditions, specialized platforms like calculCEE offer very useful simulators.

What types of improvement work on district heating networks are eligible for CEE subsidies?

Beyond simple connections, the CEE mechanism encourages various operations aimed at improving the performance and sustainability of urban networks. These initiatives are essential to optimize thermal distribution and maximize the achieved energy savings.

Insulation of singular points in the network

Thermal insulation plays a critical role in minimizing losses during the transport of the heat transfer fluid. Valves, taps, and substations are particularly sensitive areas. The sheet RES-CH-107 governs this aid by setting a thermal resistance threshold that the insulators used must meet.

Transition to low temperature

Adjusting the temperature of networks by reducing that of the circulating water limits losses. This operation also improves compatibility with low-temperature emitters, such as modern underfloor heating. The sheet RES-CH-105 allows for obtaining a subsidy based on the size and length of the network.

Extension and modernization of the network

To cover new areas or buildings, extension is crucial. Creating and connecting to a virtuous network allows for integrating more renewable production installations. ADEME offers additional support through development aids (read here).

• Installation of optimized pipelines;
• Implementation of high-performance substations;
• Renovation of boiler rooms in favor of more energy-efficient motors.

Action	Objective	Associated CEE sheet	Technical advantage
Insulation of singular points	Reduction of thermal losses	RES-CH-107	Improvement of thermal resistance
Transition to low temperature	Optimization of transport and compatibility	RES-CH-105	Reduction of energy losses
Network extension	Increased geographical coverage	–	Development of renewable energies

The qualified works not only allow for savings on energy bills but also facilitate the qualification of sites in a sustainable approach, often required by public tenders or concession contracts managed by entities like RTE or Suez.

How to apply for and benefit from CEE aids for your district heating network?

Obtaining these subsidies involves understanding the associated administrative and technical procedures. They require methodical support to ensure compliance, validation, and payment of bonuses.

Key steps

1. Preliminary assessment: energy diagnosis of the existing setup and identification of the appropriate project
2. Choice of professional: recognized experts such as operators in the sector (qualified plumbers, specialized engineering firms, suppliers like Engie)
3. Preparing the file: formalities to be completed with the obligated parties to declare the operation
4. Execution of works: technical support and rigorous follow-up
5. Validation and reception: inspection, control, and final award of the bonus

Owners and managers wishing to limit their expenses can rely on industry specialists capable of quickly intervening and guiding the file toward acceptance. Organizations like France Chaleur Urbaine also list available aids and eligibility conditions.

Interactions with other aid mechanisms

The CEE bonuses can be combined with other subsidies, particularly those offered by ADEME through the Heat Fund. This combination is particularly interesting for extension or creation projects of new networks. It allows for a global reduction in costs, facilitating the engagement of communities and professional actors.

• Government aids for energy renovation
• Subsidies for global renovations
• Official CEE mechanism
• Bonus Coup de Pouce Renewable Heating

Mechanism	Condition	Possibility of accumulation
CEE	Energy-saving works	Yes, with Heat Fund and other aids
ADEME Heat Fund	Creation, extension of networks	Yes, specifically on investment
Local aids	Variable depending on communities	Yes, depending on the cases

A quick contact with local stakeholders, as well as a specific case study, will clarify the best combination of aids suited to each situation. Do not hesitate to consult an experienced professional to gain peace of mind regarding the procedures.

The key players in the development of district heating networks and their impact on local energy transition

The development of district heating networks in France is supported by a solid network of public and private actors, combining technical expertise and environmental commitment.

Public operators and concessionaires

• Dalkia: leader in the management and operation of thermal networks, with the project in Serre Chevalier focusing on local biomass.
• Veolia: major player, brings its solutions for optimization and extension.
• Citelum: specialized in public lighting and urban energy management, participates in multi-energy coordination.

Energy suppliers and obligated parties

• EDF: committed to providing electricity but also investing in low-emission district heating networks.
• Engie: active in gas distribution and renewable solutions.
• GRDF: specialist in natural gas, supports the transition to hybrid solutions.
• Suez: connects waste management with recovered heat to feed certain networks.
• Enercoop: supplier of 100% renewable electricity, advocating for participatory energy systems.

Local authorities

The political and financial support from local authorities is decisive in the success of projects. They ensure coordination with residents, facilitate administrative procedures, and invest in building efficient and virtuous networks, in compliance with current legislation.

Role	Example	Specific contribution
Network managers	Dalkia	Operation, maintenance, extension
Obligated suppliers	GRDF, EDF	Financing via CEE, technical advice
Local authorities	Community of agglomerations	Investment, local regulations

This network of engaged actors combines know-how, technological innovations, and environmental issues, which constitutes a crucial lever in achieving national and local objectives for reducing greenhouse gas emissions.

Connecting to an efficient district heating network becomes an essential lever in strategies for renovation and sustainable construction, especially in areas like Serre Chevalier, benefiting from recognized expertise and a strong commitment to responsible development.