Clemessy SA

What Clemessy SA does

Clemessy SA is a French multitechnical engineering services provider headquartered in Mulhouse, France, operating as the dedicated industrial brand of Eiffage Énergie Systèmes, a division of the publicly listed Eiffage Group (EPA: FGR). The company traces its heritage to 1908 and delivers end-to-end services spanning audit, conception, integration, realization, commissioning, and maintenance for demanding industrial clients in France and internationally.

Its core offering is organized around three service pillars: Multitechniques (multitechnical on-site services), Bureaux d'études (engineering offices designing customized solutions), and Ingénierie de maintenance (industrial maintenance engineering). Underlying competencies span electrical engineering (génie électrique), industrial engineering (génie industriel), and climate engineering (génie climatique), increasingly augmented by digital technologies including data science, augmented reality, and cybersecurity, plus new decarbonation solutions. Turnkey design (conception clés en main) based on innovative testing, control, and production equipment is a notable technical differentiator.

The business model is enterprise B2B services sold through direct field sales to large industrial buyers across 15+ verticals, including aerospace and space (ArianeGroup), nuclear research and energy (CEA, EDF), environment (Véolia), defense (ESID Brest / Île Longue), pharmaceutical and cosmetics, petrochemical and chemical, automotive, agri-food, metallurgy, shipbuilding, gas, and photovoltaic energy. Revenue is generated via professional services (design, integration, realization) and managed/industrial maintenance services, with quote-based, project-specific pricing that is not publicly disclosed. Marketing is conducted primarily through corporate social channels under the Eiffage Énergie Systèmes brand umbrella.

Name

Clemessy SA

Legal name

Clemessy

Website

https://fr.clemessy.com

Company type

Private

Founded year

1908

Operating status

Operating

Short description

Clemessy SA is a French multitechnical engineering services provider, the industrial brand of Eiffage Énergie Systèmes, delivering design, integration, commissioning, and maintenance solutions to enterprise and government clients across nuclear, aerospace, defense, pharmaceutical, petrochemical, energy, and related industrial sectors in France and internationally.

Ownership category

akta.pro rank

Headquarters

HQ city

Mulhouse

HQ country

France

HQ region

Europe

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Industrial Engineering Services: Design, integration and realization of technical installations; engineering, organization and management of maintenance processes; turnkey design based on innovative technologies for testing, control and production equipment
2. Maintenance Services: Industrial maintenance engineering and execution services for industrial clients

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

Clemessy SA provides multitechnical engineering services for industrial clients, covering the full project lifecycle from audit, conception, and integration through realization, commissioning, and maintenance. The company combines electrical engineering (génie électrique), industrial engineering (génie industriel), and climate engineering (génie climatique) capabilities, complemented by digital technologies such as data science, augmented reality, and cybersecurity, to deliver turnkey design and maintenance solutions for demanding sectors including nuclear, aerospace, defense, pharmaceutical, petrochemical, and energy.

Product overview

Clemessy SA operates as a unified service offering within Eiffage Énergie Systèmes, providing comprehensive industrial engineering services rather than a modular software platform. The portfolio centers on three core service lines: Multitechniques (multitechnical services), Bureaux d'études (engineering office solutions), and Ingénierie de maintenance (maintenance engineering). These are delivered through the Industries du futur framework, covering the full project lifecycle from audit and design through integration, realization, commissioning, and maintenance. The company specializes in delivering turnkey solutions (conception clés en main) for complex industrial infrastructure across sectors including nuclear, aerospace, automotive, pharmaceutical, petrochemical, food, metallurgy, and energy industries. Core technical competencies include electrical engineering (génie électrique), industrial engineering (génie industriel), climate engineering (génie climatique), and digital technologies such as data science, augmented reality, and cybersecurity.

Differentiator

Problem solved

Functional benefit

Products and services

• Multitechnical Services (Multitechniques)

Named customers5 records

Segments13 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Three partnerships are on record, tiered core.

• NexanscoreStrategic or Co-development PartnerEiffage Énergie Systèmes, under which Clemessy operates, is participating in the Celtic Interconnector project for electrical interconnection between Ireland and France with Nexans.
• Hand & WerkcoreStrategic or Co-development PartnerEiffage took a majority stake in Hand & Werk to develop data center capabilities, expanding services in this growing sector.
• Eiffage Énergie SystèmescoreOthersClemessy is the brand of Eiffage Énergie Systèmes dedicated to industry, federating all competencies and expertise for industrial markets.

Recent moves1 record

Expansion highlights5 records

Broad incumbents

• Capgemini Engineering: Engineering and R&D services arm of Capgemini serving industrial, aerospace, and energy clients. Overlaps with Clemessy's digital engineering, systems integration, and industrial transformation offerings.
• VINCI Energies: Subsidiary of VINCI Group offering electrical engineering, ICT, and multi-technical services globally. Overlaps with Clemessy across industrial, energy, and infrastructure projects but at significantly larger scale and broader scope.
• Worley Limited: Global engineering and project delivery firm focused on energy, chemicals, and resources. Comparable to Clemessy on industrial EPCM and maintenance services, particularly in nuclear, petrochem, and power.
• Engie Solutions: Engie Group's B2B services arm delivering multi-technical, energy efficiency, and decarbonation services to industrial and public-sector clients. Overlaps with Clemessy on decarbonation, electrical, and HVAC work for industrial accounts.

Direct peers

• SNEF: French electrical engineering and multi-technical services firm serving industry, energy, and infrastructure. Competes head-to-head with Clemessy on industrial electrical and instrumentation work in France and internationally.
• Assystem: France-headquartered engineering and project management consultancy with a deep specialization in nuclear energy, defense, and complex industrial infrastructure. Directly comparable to Clemessy in nuclear and regulated industrial verticals.
• Akkodis (AKKA Technologies): European engineering consulting and digital services firm serving aerospace, defense, automotive, and industrial clients. Comparable to Clemessy on multitechnical industrial engineering and digital integration.
• Ingeteam: Spanish-based provider of electrical engineering, automation, and energy solutions for industrial, renewable, and water/wastewater clients. Comparable to Clemessy on industrial electrical and multitechnical site work.
• SPIE SA: French-listed multi-technical services group providing electrical, mechanical, and digital engineering services to industrial and energy clients across Europe. Closest like-for-like competitor to Clemessy on multitechnical industrial site services.
• Cegelec: VINCI Energies subsidiary providing electrical, HVAC, and multi-technical services to industrial clients. Comparable delivery model and customer base to Clemessy, particularly in process industries and energy.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/playlist?list=PLK4ZS9ji6MZe34Tx5MxCq5NfslvKQXToJ
• Facebookfr-fr.facebook.com/EiffageEnergieSystemes
• LinkedInlinkedin.com/company/clemessy
• Instagraminstagram.com/eiffageenergiesystemes/?locale=en-us

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Clemessy SA