Idex publishes the first report of its mission committee

A production mix in full transformation

Geothermal energy, locally sourced biomass, waste heat recovered from waste incineration or industrial processes, solar photovoltaics: Idex deploys a pragmatic, technology-agnostic strategy, choosing from the low-carbon solutions available the one that best meets the needs of the client and the local area.

Flagship projects:

Bordeaux Métropole: the largest contract in Idex's history

To massively decarbonize heating in the southern districts of Bordeaux Métropole, Idex is developing a heating network with exceptional features: 200 GWh of heat produced, 40 km of network, more than 20,300 home equivalents connected, a carbon content of 30 gCO₂/kWh and more than 1 million tonnes of CO₂e avoided over the life of the contract. Geothermal energy and biomass make up 77% of the mix. The rest comes from biogas and electricity with guarantees of origin, thanks to the first long-term biomethane purchase agreement (BPA) for a heating network in France. For 30 years, subscribers will benefit from 100% renewable gas produced 15 km from the boiler plant, at a price shielded from market fluctuations. Total investment: €134 million, including €9.9 million in support from Ademe and €1 million in citizen crowdfunding.

Levallois: a data center's waste heat serving a neighborhood

By combining deep geothermal energy with waste heat recovered from a data center, this pioneering heating network project will give Levallois access, from 2029, to local, low-carbon, competitive and secure energy. Ultimately, it will deliver more than 120 GWh a year, with 75% renewable and recovered energy, an unprecedented rate for such a dense urban area, and a 30% reduction in the price of heat.

Feurs: a battery run by artificial intelligence

Idex has installed a 6 MWh battery energy storage system (BESS) that responds within seconds to signals from RTE, the French grid operator. A fully decarbonized flexibility solution that replaces peak-load thermal power plants: 2 MW, 6 MWh, 3 hours of autonomy, zero direct emissions, and more than 1,000 homes supplied over a 15-year partnership. Given the success of this first phase, Idex will double its capacity and has already commissioned a similar system in Ondes (4 MW).

Bourg-Saint-Maurice: a heating network designed for the mountains

In the heart of the Alps, the hospital, schools and residential buildings relied on individual oil-fired boilers. Idex proposed the first public heating network in the Tarentaise valley, a fourth-generation network designed to handle extreme seasonal demand, reconciling the energy transition with tourist appeal just a few years ahead of the Olympic Games.

Innovation Award, Idex Victoires 2026

Local circular economy solutions

Beyond their climate impact, Idex's projects strengthen the autonomy and resilience of local areas by making the most of their own resources, creating local jobs and protecting biodiversity.

Hedgerow wood (Groupe Bel): a biomass boiler plant partly fed by wood from pruning nearby hedgerows, providing extra income for local farmers while preserving these biodiversity reservoirs.

Vine wood (Épernay): 10% of the heating network's biomass comes from vine-pruning wood, emblematic of the Champagne landscape and culture.

Brewer's grain (Heineken): the steam needed to brew beer at the Mons-en-Baroeul plant will soon be produced from agricultural waste generated by the brewing process.

Agro-pellets (La Défense): boilers fully converted to replace fossil fuels with agricultural residues, partly transported by rail to the towers of France's largest business district.

Protecting biodiversity

8 industrial sites engaged in voluntary biodiversity action plans in 2025 (2030 target: 20 sites). A national partnership with the Fédération nationale des conservatoires d'espaces naturels (FCEN). 100% of industrial sites covered by a physical climate risk assessment. At the Robert organic recovery center in Martinique, nature-based solutions strengthen the site's resilience to heavy rain and heat: more than 130 local plant species and a planted filter that recovers around 2,000 m³ of water a year.

Progressing with our supplier network

An average score of 66/100 in 2025 for suppliers assessed under the EcoVadis responsible purchasing program, with 77% of them improving their score. 2030 target: 80%.

Safety: Idex's priority

Building a shared safety culture relies on a set of concrete actions: regular reminders of the "6 golden rules," training sessions, preventive site visits, safety talks and the "Ma Sécurité" app, which lets every employee report near misses and hazardous situations in real time. The result: the frequency rate of workplace accidents resulting in time off has more than halved since 2019.

Inclusion: a conviction backed by action

A signatory of the Diversity Charter since 2021, Idex rolls out concrete action plans to support disability inclusion and gender equality. 24.4% of management positions are held by women (+2.4 points since 2022, 2030 target: 28%). 94% of employees with disabilities had an annual review to assess their support needs (2030 target: 100%). 85 employees are involved in mentoring programs.

A stimulating environment, grounded in our mission

Energy transition jobs offer full employment and genuine purpose. To help raise awareness of these careers, Idex offers work-experience placements for middle school students and runs awareness events starting as early as that age. Since 2019, work-study programs have grown significantly: apprentices now make up 7.2% of the workforce (+2.6 points vs. 2022). 2,500 employees have taken part in a Climate Fresk workshop, run by 13 in-house facilitators. Following discussions with the mission committee, three new actions were adopted: extending the onboarding program to one year, developing health-prevention initiatives tailored to technicians over 50, and professionalizing post-hire support for employees recruited through workplace integration programs.