29 October 2012 Last updated at 14:31 ET

First electricity produced at London Array wind farm

The first phase of the London Array project is due to be completed by the end of 2012, with 151 of the 175 turbines installed so far

Electricity has been produced for the first time at an offshore wind farm which will become one of the world's largest.

The first phase of the London Array project is due to be completed by the end of 2012 with 151 of the 175 turbines installed so far.

It is being built in the Thames Estuary and will produce enough power for an estimated 470,000 homes.

A second phase with a further 166 turbines is yet to be approved.

The projects consortium is made up of energy companies E.On, Dong Energy and Masdar.