G1 and G2 PRO Projects
RTE is connecting the wind farm in the South Atlantic off the coast of Île d’Oléron (1,000 MW) to the French onshore electricity grid.
The 320 kV HVDC link consists of two power cables and one optical cable. The technical solution selected and studied by terrasol for the landfall is directional drilling.
terrasol recommends a route that “dives” into the Kimmeridgian limestone formation, which allows for better control of drilling operations and technical risks.
As technical consultants to the project owner, terrasol carried out feasibility studies (G1) at four potential landing sites, providing the basis for consultations and the selection of the option with the least impact.
The assignment included, in particular, a comparative analysis of technical solutions, namely directional drilling, microtunnelling, or open-cut trenching.
On behalf of RTE, Terrasol defined and then monitored the programme of geotechnical and geophysical investigations.
Finally, Terrasol is carrying out the geotechnical design study (G2 PRO) at the landing site ultimately selected by RTE. In particular, Terrasol is compiling the geotechnical and geophysical data, determining the dimensions of the borehole and casings, and calculating the pulling force required to select a drilling contractor.
Key details
- 320 kV HVDC link comprising two power cables and one optical cable
- Landfall via directional drilling over a length of approximately 500 m
Partners
Setec in vivo
Client
RTE
