Clemessy SA
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.
- Company typePrivate
- Founded1908
- HeadquartersMulhouse, France
- Headcount—
- GTM typeB2B
- OfferingServices
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.
Clemessy SA firmographics
Firmographics- 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
Where Clemessy SA is headquartered
LocationHeadquarters
- HQ city
- Mulhouse
- HQ country
- France
- HQ region
- Europe
Markets served
Clemessy SA business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales
Revenue model
- 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
- Maintenance Services: Industrial maintenance engineering and execution services for industrial clients
Go-to-market motion1 record
Distribution channels1 record
Marketing channels6 records
Clemessy SA product offering
Product offeringCore 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)
Companies that use Clemessy SA
Customer profileNamed customers5 records
Segments13 records
Ideal customer profiles2 records
Clemessy SA technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
Clemessy SA partnerships and signals
Strategic signalPartnerships
Three partnerships are on record, tiered core.
- NexanscoreEiffage Énergie Systèmes, under which Clemessy operates, is participating in the Celtic Interconnector project for electrical interconnection between Ireland and France with Nexans.
- Hand & WerkcoreEiffage took a majority stake in Hand & Werk to develop data center capabilities, expanding services in this growing sector.
- Eiffage Énergie SystèmescoreClemessy is the brand of Eiffage Énergie Systèmes dedicated to industry, federating all competencies and expertise for industrial markets.
Recent moves1 record
Expansion highlights5 records
Clemessy SA competitors and assessment
Company assessmentBroad 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
Clemessy SA social profiles
Digital presenceClemessy SA financial estimates
Financial estimateRevenue estimate
Valuation estimate
Clemessy SA leadership team
Management profileNumber of profiles
Clemessy SA funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Clemessy SA M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Clemessy SA
What does Clemessy SA do?
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.
Is Clemessy SA a public or private company?
Clemessy SA is a private company. It is classified as corporate owned and is currently operating.
When was Clemessy SA founded?
Clemessy SA was founded in 1908.
Where is Clemessy SA based?
Clemessy SA is headquartered in Mulhouse, France, in the Europe region.
How does Clemessy SA make money?
Two revenue lines are on record. Industrial Engineering Services are the primary driver. The others are maintenance Services.
Who are Clemessy SA's main competitors?
Broad incumbents on record are Capgemini Engineering, VINCI Energies, Worley Limited and Engie Solutions. Direct peers are SNEF, Assystem, Akkodis (AKKA Technologies), Ingeteam, SPIE SA and Cegelec.
Does Clemessy SA have an API?
No public API is recorded for Clemessy SA.