ETA has been involved with offshore renewable projects since ‘North Hoyle’, the UK’s first major offshore windfarm project. ETA has provided support on all aspects of the cable installation and maintenance, offering services from total project management as ‘cable package managers’, to 'one-off' consultancy assignments, design work, planning, and technical studies.
Alongside our work in the offshore wind market below, ETA’s expertise have been acquired from their background in the installation and maintenance of subsea cable in the traditional fields of power cable, telecom, or offshore oil and gas projects as well as from their extensive involvement with other offshore renewables such as Tidal Energy.
A sample of ETA’s varied experience in the Offshore Wind market can be found below.
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Teesside Offshore Windfarm is a 62 MW windfarm constructed just east of the mouth of the River Tees. ETA were brought in by owners EDF Energy Renewables to act as Offshore Cable Package Managers for the project.
Constructed in summer 2003, National Wind Power (NWP)'s North Hoyle Offshore Wind Farm was the first of the 'Round 1' UK offshore wind farms to provide power to the grid. Working for Mayflower through their appointed electrical systems consultant Econnnect, ETA provided detailed input to marine cable installation specification and tender processes.
Following this, ETA provided ongoing project management and engineering support to both Econnect and Mayflower. Key areas of responsibility included technical aspects of infield and export cable installation, planning and logistics, including use of GIS to integrate survey and installation drawings and data. ETA provided the Offshore Superintendent for the installation of the infield cabling, utilising Mayflower's innovative subsea cable lay and burial tractor.
ETA's engineering division also supplied additional cable installation equipment under a bespoke design and build contract.
Q7, now known as Princess Amalia Wind Farm, is a 120MW (60 turbine) windfarm off Ijmuiden in the Netherlands. The cable system consists of 2x120kV (27km) export cables to shore and a 22kV (45km) infield cable network.
ETA project managed the full cable procurement and installation package on behalf of the windfarm owners (Eneco) including route survey, burial assessment and final determination of the cable lengths, types, routes and burial strategies. Soil types varied between mobile sands and clays.
Cable protection was achieved utilizing a jetting tracked ROV and rock placement at foundations which also provided scour protection.
Belwind Wind Farm is a 165MW (55 turbines), windfarm located 46km from the Belgian port of Zeebrugge. The cable system comprises 150kV export and 33kV infield cables. ETA acted as offshore cable package manager for the main contractor throughout the project.
Particular seabed soil conditions included sand waves requiring careful management. Cable protection was achieved utilizing a Jetting tracked ROV, Jetting sledge and rock placement at foundations.