Omexom Nuclear Projects


52-58 av. Jean Jaurès, 92700 Colombes

Other locations :
Bâtiment Le SUNWAY
257-259 Av. Jean Jaurès, 69007 Lyon
ISDEL ENERGY LIMITED (a Vinci Energies company)
160 Aztec West, Park Avenue,
Almondsbury, Bristol BS32 4TU, UK

Who we are ?

Omexom Nuclear Projects (ONP) is the business unit of the Nuclear Division of Vinci Energies dedicated to the electrical installations of the EPR, EDF’s Nuclear new build program.
Our vocation is to design and build the electrical installations of these new Nuclear Power Plants in accordance with the required quality and nuclear safety standards.
The business unit is based in Colombes, close to Paris, but can also rely on its locations in Lyon and Bristol (UK) to address our international projects.

Key figures

  • collaborators
  • M€
  • years
    of expertise
  • Major references
    Flamanville EPR, Hinkley Point C EPR (UK), Activated waste conditioning and storage facility (ICEDA)
  • Our expertises

    • Our engineering specialities are:

      • High & low voltage – single line diagrams, sizing, technical specifications
      • Installation of equipment and cable trays & cable routing (IEG & IED)
      • Seismic stress resistance calculations (supports, etc.)
      • Design & manufacturing of electrical cabinets & boxes
      • K3 qualification of equipment
      • Fire detection (JDT), CCTV/PA, access control, lighting (IED)
      • Instrumentation & Control’s – architectures, functional analyses, specifications
    • The business unit also has strong expertise in Site Management & Construction:

      • Logistics
      • Sourcing
      • Sub-contractors management
      • Scheduling
      • Co-activity management

    Our jobs

    • Project Director,
    • Project Manager,
    • Project Controls Manager,
    • Design Engineer, CAD Designer,
    • Planning Engineer,
    • Construction Manager,
    • QHSSE Manager,
    • Tender Engineer, etc.

    Join us by applying directly on and following us on LinkedIn.

    YR5301 – IEG FA3 (Flamanville 3) EPC contract (including K3 qualification)

    – 2.500 drawings, specifications & other documents
    – 150km of cable trays
    – 2.200km of cables
    – 63.000 terminations
    – 3.000 cabinets & boxes
    – 5 turnkey systems
    > 1.000.000 engineering manhours
    > 5.500.000 site manhours


    • Control systems, supervision of waste container handling
    • Engineering and installation of cable trays and seismic supports
    • Design and installation of electrical cabinets according to nuclear requirements
    • Radiation protection studies
    • Fire detection system, communication, video surveillance, access control (C2 EVEREST detection gate, CPO SMART, etc)…

    HK5301.01 – IEG HPC Manufacturing & execution design

    Scope :Design, qualification & support to site activities

    – 200km of cable trays

    – 60.000 supports

    – Earthing & bonding

    – Pre design for electrical cabinets & boxes

    – Turnkey systems (KSC, LYS, LAI)

    > 360.000 manhours at 2022 end

    290.000 engineering manhours

    70.000 project controls, quality & project management manhours


    Nuclear safety : ISO 19443
    Quality : ISO 9001
    H&S : ISO 45001
    Fire detection : APSAD I7
    Radiation protection : certification Qualianor
    Qualified by UTO (EDF supply chain management)
    CSR (Corporate social responsibility) : Afnor ISO 26000

    15/02/2024 Norway

    Norway: Otera AS celebrates rebranding, joins Omexom network

    On February 2, Omexom in Norway welcomed close to 300 new colleagues with a rebranding event spread in the locations of Kristiansand, Lyngdal, Evje and Møre.
    Read more
    30/10/2023 Overhead transmission lines, Substations, Sweden

    Omexom in Sweden starts construction on three major projects, marks milestone in collaboration with both TSOs and DSOs

    The Omexom business unit in Sundsvall has secured three new contracts with a total order amount of €70 million. Building on long-standing partnerships with clients Svenska kraftnät and Sundsvall Elnät AB, the projects include the reconstruction and new construction of Odensala which is the largest air-insulated switchgear in Sweden so far.
    Read more
    21/08/2023 Environment, Sweden, Underground distribution lines

    Omexom in Sweden reduces environmental impact in distribution project

    ‘Groundbreaking’ takes on a new meaning at an underground distribution site for Omexom in Sweden:  the business unit and its project partners have inherently redesigned the project to adopt a comprehensive environmental approach.
    Read more
    31/05/2023 Distribution, Finland

    Eitech and Omexom sign contract for major power distribution project in Finland

    Eitech in collaboration with Omexom has won the assignment to deliver and install the entire power distribution in an extensive infrastructure project in Finland. The large and complex project will begin in 2023 and will last for almost two years with completion scheduled by spring of 2025.
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    20/04/2023 New Zealand

    New Zealand: Electrix rebrands to Omexom

    This April, New Zealand energy services contractor Electrix begins operations under its new name, Omexom. Founded in New Zealand in 1955, Electrix established itself as a leading provider of engineering, construction, and maintenance services to asset owners in the electricity and gas utility, industrial, commercial, resources, and infrastructure sectors.
    Read more
    05/04/2023 Belgium, High voltage, Substations

    Omexom Belgium refurbishes Noordschote substation

    Located in a rural village of only 600 inhabitants, the Noordschote high-voltage substation is an important node in its area as it supplies the entire Westhoek region with electricity. To prepare for higher electricity demands in the future, Omexom in Belgium is modernising the installation, making it more sustainable.
    Read more
    24/01/2023 Distribution, Finland, Transmission

    Omexom broadens its activities in Finland by welcoming TLT-Building and TLT-Connection

    VINCI Energies acquired two multi-technical companies providing global solutions for electrical and telecommunication network operators in October 2022, and is accelerating their integration with two rebrandings: TLT-Building and TLT-Connection activities in transmission and distribution join Omexom in Finland, while TLT-Connection telecommunication business becomes Axians.
    Read more
    29/11/2022 Portugal, Power, Solar

    Ready for takeoff: Omexom in Portugal finishes first Portuguese solar farm at Faro airport

    The only international airport in the Algarve region, Faro welcomes about 9 million passengers yearly. Starting this summer, the airport, operated by VINCI Airports, is expected to self-produce 30% of its energy needs with solar energy and save an equivalent of 1,500 tons/ year of CO2 thanks to its solar farm. The Faro Airport project exemplifies the strength of the VINCI companies’ network, spanning various expertise, including that of Omexom in Portugal.
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    14/09/2022 France, Hydro, Power

    Omexom modernised the Takamaka hydroelectric power plant on Reunion Island

    The Takamaka hydroelectric plant nestles in a tropical valley in Reunion’s national park. The power plant – the island’s primary source of renewable energy – requires modernisation work in which Omexom Montélimar is playing its part.
    Read more
    08/09/2022 Biodiversity, Environment, France, Omexom Green Story

    Episode 10 – Omexom Green Story: Providing safe nesting spots for birds

    In line with one of the three key areas of VINCI’s environmental ambition: Preserving natural environments, the Omexom business unit Omexom Nîmes LA has been taking important steps to protect birds in its territory of intervention.
    Read more