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Current projects

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Creation of an underground electric link to the Calvados wind farm

In March 2021, building works began to the wind farm off the Calvados coast, with commissioning scheduled for 2024. RTE entrusted SADERTELEC with the creation of the project’s dual electric land link. Works were carried out in synergy with the Rouen RD up to February 2022.

Very High Voltage

Located 10 to 15km off the Courseulles-sur-Mer coastline, this wind farm will consist of 64 wind turbines capable of producing 450MW, i.e. 90% of the power needs of the Calvados area (approximately 630,000 inhabitants). Its production will be transported to the Ranville electrical substation via a dual three-phase 225,000-volt link, which extends 15km offshore and 24km underground onshore, with the intersection point at Bernières-sur-Mer.

Dual link

From this landing point to Ranville, SADERTELEC’s task, with the support of the Rouen RD teams, is to build the underground facilities for the wind farm’s electrical cable and control network, with 36 cable and connection pits, and to lay 108 electric cable reels averaging 1.4km in length using the unwinding-traction technique.

Outstanding synergy

SADERTELEC has been a shining example of in-house cooperation since its creation. Specialised in RTE works, this expert entity operates throughout France and calls on the support of the Group’s local resources whenever possible. For these works, the largest project entrusted by RTE to SADERTELEC to date, the Rouen RD teams carried out most of the excavation, civil engineering and backfilling works.

Rouen RD excavates, builds and pours

In concrete nozzle blocks poured on site, the two electric links are laid along symmetric, parallel and individually insulated paths. Each link is three-phase, and therefore composed of three 200mm-diameter PVC sleeves, lined with three 50mm-diameter PVC sleeves housing the optic fibre. These blocks were sized by RTE and built according to a strict protocol of precise measurements. A protocol followed to a T on a daily basis by the Rouen RD teams, organised in workshops and progressing at an average rate of 60m per day: opening, shoring, laying of supports and sleeves, concrete casting, shoring removal and backfilling. Within 11 months, the total contents of 2000 concrete mixer trucks will have been poured on site.

SADERTELEC unwinds

In addition to steering the works and building most of the 36 connection pits, the SADERTELEC teams are also laying this imposing underground facility, and from pit to pit, 108 cable sections, mainly in aluminium (ø 1,600mm² and 2000mm²), with a small proportion of enamelled copper (1,600mm²). Delivered in reels weighing 24 to 32 tonnes, they are laid under supervision using the unwinding-traction technique, a demanding method which prohibits any form of damage to the cable or its protective tube.

Top-of-the-range equipment!

To manage this sensitive phase, SADERTELEC is equipped with the latest generation of high-performance equipment: reel jacks, a traction unwinder and a 150KN winch holding the reels of Dyneema® traction cables, which are lighter and more resistant than steel.

Safety: a joint concern

While SADE Group operators are naturally vigilant as to risk prevention and work safety, they are nevertheless subject to frequent inspections by RTE and its agents. Work safety is joint concern, and these inspections provide an ideal opportunity for discussion and the continuous improvement of processes.

SADERTELEC’s expertise, SADE’s solid national network and the teams’ ability to work in total synergy are all strengths. They enable us to respond to RTE’s needs on a nationwide level, with the resources and know-how to guarantee high quality and compliant lead times.

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23-25 av. du Docteur Lannelongue
75014 Paris

  • IN BRIEF
    • Profile
    • Anchoring
    • Path
  • PROFESSIONS
    • Systems
    • Infrastructure
  • SERVICES & SOLUTIONS
    • Regional authorities
    • Industries
    • Major infrastructures
  • REFERENCES
  • CSR
  • APPLICATIONS
  • NEWS
  • CONTACT

Legal notice Ι Anticorruption code of conduct Ι Occupational gender equality index Ι Personal Data Protection Policy Ι Suppliers relationship © 2021 All rights reserved

Fraud Warning

It has come to our attention that emails have been sent by individuals falsely claiming to be SADE employees. The objective of these emails is to place false orders using our company’s name. Read more…

In the emails detected to date, the fraudsters are writing from the addresses “[email protected]” or “[email protected]”. They use our logo and Paris 75014 address.

We wish to draw your attention to the fact that these email addresses do not correspond to SADE’s email address, which bears the domain name sade-cgth.fr.

We thus advise caution in your communication and request that you do not exchange documents or information with persons other than your usual contacts at SADE. If you are in any doubt, we advise you to speak to your usual contacts prior to the transmission of any document or information.

As fraudsters regularly change their operating mode, we also recommend you alert all your employees likely to have dealings in this area (purchasing, accounting or payroll, etc.).

SADE systematically lodges an official complaint in response to such acts. We would be grateful if you could notify us at the following address of any contact you may have had with individuals claiming to be employees of our company: [[email protected]]