Iberdrola and Navantia sign the contract for the East Anglia 1 substation

Iberdrola and Navantia have signed, in London, the contract to construct the electrical substation for the East Anglia 1 offshore wind farm in the UK. The scope of the contract includes the construction of one module, its jacket support structure, at the Puerto Real shipyard and the offshore support for its connection and commissioning in the North Sea.

The contract will involve an estimated workforce of on average 350 people, however there will be peaks of up to 600 over the next two years. The works will start shortly and will conclude in around 2 years’ time with the installation of the jacket and the module in the North Sea.


Navantia is expected to collaborate with and support Iberdrola over the coming months in the initial project phase, in the development of the engineering works as well as in other activities with the aim of guaranteeing delivery periods and the quality of the supplies from the main collaborators. Manufacturing will start next spring.

The East Anglia 1 wind farm is situated in the south-eastern area of the North Sea, some 45 km south-east of the town of Lowestoft and covers an area of some 300km2. East Anglia 1 comprises 102 wind turbines with a total installed capacity of up to 714 MW. The wind turbines will be assembled on jacket-type steel structures.

Navantia also has a pre-agreement in place, expected to be signed soon, to construct 42 jackets that will support the wind turbines. These parts will be manufactured at the Navantia shipyard in Fene, Ferrol.

The wind farm is equipped with an electric substation (OSS) and two AC circuits connected to an onshore substation in Bramford (north of Ipswich), adjacent to the existing National Grid substation. The module consists of four housings supported by 4 feet covering a surface of 22 x 26 m. The total estimated weight of the module is around 3,500 tonnes.

The total height of the jacket is 58 m, including 12 J-tubes for the cables array and a further 2 for the transmission cable. It will also be equipped with two boat landings so that vessels can moor to the substation. The total weight of the jacket structure is approximately 2,400 tonnes and that of the 4 piles is 1,167 tonnes.