RWE Innogy has appointed Alstom and Petrofac to begin the detailed design of the electrical system for the 340 MW Galloper offshore wind farm planned off the coast of Suffolk, UK.

As part of the multimillion-pound contract, the UK-based consortium will provide the onshore and offshore substations and onshore cabling. It will also be responsible for ordering of some major electrical components such as transformers, SVCs and offshore switchgear.

RWE says it expects the scope of the contact to be extended once a final investment decision is made for Galloper later in 2014.

Meanwhile, it says that enabling works for Galloper’s onshore substation located near Sizewell in Suffolk are well underway with onshore cable installation works due to begin in early 2015. Further announcements are expected shortly on the selection of preferred suppliers for other key contracts, says RWE.