Earlier, DEME Offshore had transported the 2,100-metric ton (2,315-ton) structure, also performing pre-piling works.
The Pioneering Spirit lifted the electrical substation onto its jacket foundation yesterday, having installed the 50-m (164-ft) high supporting structure earlier this week.
A consortium of Atlantique Offshore Energy, GE Grid Solutions and DEME Group’s French subsidiary SDI constructed the OSS for the 480-MW offshore wind project, developed by EDF Renouvelables and EIH S.à r.l, a subsidiary of Enbridge Inc and CPP Investments.
The Saint-Nazaire wind farm (Parc du Banc de Guérand) is due to start operating in 2022. The substation measures 15 x 27 x 39 m (49 x 88.6 x 128 ft), while the jacket is 26 x 26 x 48 m (85 x 85 x 157 ft) and weighs 1,250 tons.
Chantiers de l’Atlantique managed the topsides and jacket foundation design, manufacturing and commissioning.
GE Grid Solutions’s ACS division in Saint-Priest, France, designed and integrated the high and medium-voltage systems.
These include five 220-kV gas-insulated switchgears manufactured in Aix Les Bains, southern France; two 220/33kV transformers made in Mönchengladbach, western Germany; two SCADA systems developed in Montpellier, southern France; and one 33-kV gas insulated switchgear and a telecommunication system.