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Chef de projet décarbonation

IDEX • France • Added on Sep 8, 2026
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As a Decarbonization Project Manager, you will take full ownership of the technical and financial steering of low-carbon energy infrastructure projects. You will oversee the entire lifecycle, from initial design and complex cost modeling to final implementation, focusing on high-impact sites such as hospitals, aquatic centers, and district heating networks. This is a highly operational role that requires bridge-building between technical design and financial feasibility to ensure energy performance targets are met.

Working for a mission-driven company like Idex means your daily output directly translates into measurable carbon reduction for local territories. You will be at the forefront of the energy transition, transforming aging building stocks and energy systems into efficient, decarbonized assets. This role offers the rare opportunity to apply deep engineering expertise to solve the urgent climate crisis through concrete, local infrastructure improvements across France.

This suits someone who is a technical expert in thermal engineering or HVAC with at least eight years of experience in project management. You should thrive in a cross-functional environment where technical precision meets strategic carbon reduction goals.

Job FAQs

What are the main missions and responsibilities of this role?

The core of this role involves leading complex decarbonization projects for diverse infrastructures, ranging from health facilities to residential energy networks. You will be responsible for the full project lifecycle, including technical design, financial planning (CAPEX and OPEX), and performance monitoring. You will also be expected to act as a technical advisor, defining the scopes of intervention for energy renovations and new builds. A significant portion of your responsibility involves energy performance modeling and ensuring that the final infrastructure delivers the promised carbon savings through optimized HVAC and renewable energy integration.

Key learning opportunities for this job

Candidates will gain significant expertise in the rapidly evolving field of low-carbon energy systems, including heat recovery, geothermal energy, and advanced Building Management Systems (BMS). You will learn how to navigate the technical and regulatory landscape of mission-driven energy services in France. Furthermore, the role offers deep exposure to multi-stakeholder coordination, allowing you to refine your ability to align technical requirements with financial constraints and environmental goals. Mentorship from senior technical directors and exposure to innovative renovation technologies will be central to your professional development.

How does the ideal candidate look like (experience, skills)?

The successful candidate is an Engineer by training, specialized in thermal energy, HVAC, or building services, with a minimum of 8 to 10 years of experience. You must possess strong skills in energy cost estimation (CAPEX/P4) and be proficient with energy simulation software. Beyond technical skills, the ideal profile shows a high degree of rigor and autonomy. Because this role requires national mobility and cross-functional collaboration, strong communication skills and the ability to influence diverse internal and external partners are essential.

Advice to stand out and make a successful application

To stand out, emphasize your track record in managing large-scale renovation projects where energy performance was the primary KPI. Clearly quantify the carbon impact or energy savings achieved in your previous roles to demonstrate alignment with Idex's status as a mission-driven company. Preparing a detailed discussion on how you handle financial trade-offs between initial investment and long-term energy performance will show that you understand the operational reality of energy service contracts. Familiarize yourself with Idex's recent territorial projects to show genuine interest in their local impact strategy.

What aspects of the company's sustainability is this role likely to focus on?

This role is directly focused on territorial decarbonization, which is the cornerstone of Idex's sustainability strategy. You will be working on reducing the Scope 1 and 2 emissions of their clients' infrastructures, which contributes significantly to France's national carbon reduction targets. Specifically, you will focus on energy efficiency and the replacement of fossil-fuel-based heating with renewable sources like biomass or geothermal. Your work ensures that the group's transition to a mission-driven company is backed by measurable technical achievements on the ground.

What are the main challenges someone in this role might face?

One of the primary challenges will be balancing technical innovation with financial viability. You will often need to find creative solutions to renovate aging buildings while meeting strict budget constraints and ambitious energy performance guarantees. Another challenge is the transverse coordination required between design offices, local regions, and external partners. Ensuring everyone remains aligned on technical standards and deadlines across multiple national sites requires high-level organizational skills and resilience.

How could a typical day look like for someone in this position?

A typical day might begin with a technical review of a new hospital renovation project, followed by a meeting with a design office to refine energy simulation models. You would spend time building detailed CAPEX and P4 cost structures to ensure project profitability and performance. Afternoons might involve site visits or virtual check-ins with regional teams to monitor the progress of ongoing installations. You will likely end the day synthesizing data into a decision dossier for the project committee or researching new energy-saving technologies to integrate into future offers.

What are the opportunities for professional growth and development in this role?

This role offers a clear path toward Technical Director or Regional Management positions within the group. Given Idex's vertical integration, there are also opportunities to move into specialized roles in renewable energy production or strategic asset management. You will have high visibility on strategic projects, providing a platform to influence the group's technical standards. As Idex continues its growth as a mission-driven entity, leaders in decarbonization will be at the forefront of the group's long-term leadership team.

The main stakeholders you might be interacting with

Internal stakeholders include the Technical and Bidding Departments, as well as regional operational teams who will eventually manage the facilities. You will also collaborate closely with energy experts to validate technical assumptions. External interactions will focus on design offices (BET), equipment suppliers, and public or private clients. You will also represent Idex before institutional partners, ensuring that the projects comply with local regulations and sustainability subsidies.

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