Omexom CEM Services



Our company

Omexom CEM Services is the specialist of rotating machines, especially alternators, and offers solutions and electrical turnkey services. The company has about fifty employees, highly qualified in their field.
For over 50 years, we assist our clients in French hydropower fleet (EDF, CNR, SHEM) and we export worldwide our know-how for major suppliers of hydropower, thermal and gas electricity.

  • Site Interventions: commissioning engineers and expertise in situ
  • Experienced protagonists for repair and assembly on site
  • Study and engineering control of alternators offices
  • Responsiveness and sense of service: ability to face unexpected technical problems
  • Strong expertise and proximity to customers in France and in foreign countries
  • Innovation and investments: SS3 and SS4 asbestos qualification, soldering tools, software and analysis tools, test facilities, AFAQ ISO 9001, ISO 14001, OHSAS 18001 qualifications, etc.


  • Strengthening our expertise and proximity through the mesh between the VINCI Energies business,
  • Sharing our expertise and our knowledge management by expertise capitalization system
  • Solid partnerships with strong value added for turnkey projects
  • Local and international presence with Omexom expert entities
  • VINCI Energies Workshops


Study and engineering office:

  • 3D modeling and developing plans folders
  • Electromagnetic and thermal design of stators
  • Mechanical design of carcasses
  • Turnkey study of electrical projects


Shelf project management:

  • Sales managers
  • Dedicated technical managers

Inspection and Quality Control:

  • Quality monitoring of outsourced achievements


  • International intervention
  • Reactive and specialized autonomous Team (foremen, technicians, assemblers)
  • Testing and commissioning
  • Facilities expertise and audit



Our expertise

Omexom CEM Services realizes turnkey projects in France and abroad thanks to its technical and organizational skills.

Our expertise allows us, starting from a specification, to study, to supply, install and commissioning of complete installations in accordance with customer requirements.


Hydropower, thermal and gas alternators:

  • Renovation and reconstruction of frames, magnetic circuit, coils and auxilary
  • Rotors and stators maintenance
  • Remonval, lineage and rotor poles extraction
  • Works under asbestos, in SS3 and SS4 subsection

Excitation system:

  • Supply, renovation and maintenance of excitators
  • Replacement of DC generators by reverse alternators with rotating diode system
  • Supply of voltage regulators and excitation cabinets of rotating machines

Synchronous compensation:

  • Turnkey project of rotating machines to supply reactive power to the power grid

Nuclear alternators:

  • Winding and rewinding works on 900MW and 1300MW alternators

Mechanical maintenances:

  • Polar extractions process
  • Disassembly and reassembly of the whole generator
  • Shaft alignment and balancing

Modification and mechanical maintenance:

  • Ring sets supplying
  • Upper block of stud bearing
  • Air flow guides replacement
  • Modification & replacement of generator cooling system





Power benches:

Study, engineering, supplying and installation of:

  • motors’ turnkey test bench, transformers, selfs, etc.
  • 50 – 60 Hz frequency converters
  • reactive power compensation

Testing and diagnostics:

  • Diagnostic of electrical machines insulations and specific tests (tg δ, partial discharge, vibration analysis, infrared thermal measurements, etc.)

Remote control of rotating machines:

  • Remote control study and supply
  • Electrical protections suply and/or control
  • Remote control refurbishment.

Voltage regulation:

  • Supply and replacement of excitation cabinets of rotating machines




The team training is our priority

The quality of services is based on skill, experience and precision of our teams, which is why we attach great importance to maintaining and developing the skills of our employees.

Our certifications

  • Quality: ISO 9001 V. 2008
  • Environment: ISO 14001 V. 2004
  • Safety: OHSAS 18001 V. 2007


  •  Asbestos: subsection 3 and 4

EDF Certification for the following activities

  • Tooling & Expendables
  • Operations Big Components
  • Coppersmith / Pipes
  • Rotating machines
  • Electricity and Control-System
  • Intellectual services and technical assistance

Contact us

Omexom CEM Services

Parc du Moulin à vent – Bât 58
33, avenue Docteur Georges Lévy
69200 VENISSIEUX – France

Tel.: +33(0)4 37 53 01 01
Fax: +33(0)4 37 53 01 00


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