The two vessels, namely the CWind Alliance and CWind Artimus, will be used to support operation and maintenance (O&M) activities at the wind farm.
Both the vessels will be operating from Ramsgate in Kent. CWind Alliance was earlier used at the site in 2012.
CWind business development manager Bruce Clements said: "We are delighted to have won this contract following a challenging competitive tender process and we look forward to working with London Array Ltd and its partners over the coming years."
London Array wind farm is owned by E.ON, Dong Energy, Masdar and Canadian pension fund La Caisse de dépôt et placement du Québec.
Located 20 km off the Kent coast in the outer Thames Estuary in the UK, the wind farm features 175 turbines.
Construction on the first phase of the project started in March 2011 and was completed by mid 2013.
Phase one generates enough energy to power about 500,000 households in the UK and helps in cutting down more than 900,000 tons of CO2 emissions per year.
The second phase of the project was refused planning consent in 2014 due to concerns on impact on a particular species of bird that passes through within the wind farm’s boundaries.
Image: London Array offshore wind farm. Photo: courtesy of London Array.
