Rapid developments in the wind turbine industry may mean that larger and even more efficient turbines can be used in the later phases of the project. For this reason, it is expected that the London Array turbines will range between 3MW and 7MW in electrical capacity, depending on when they are installed. The exact size of the turbines is uncertain at this stage, but the hub heights will be between 85m and 100m above sea level, and the total turbine height won’t be greater than 175m.

The wind turbines will typically begin generating electricity at a minimum wind speed of 3 metres per second (m/s) or approximately 7mph, with full power being achieved from 13m/s (approx. 29mph). For safety reasons they would begin to shut down at wind speeds greater than 25m/s (approx. 56mph or a force 9 gale).

The turbines will have three blades, as commonly used on onshore wind farms and as shown on the picture to the right. The colour of the turbines is decided by the consenting authorities but would typically be grey. There may also be a requirement for a brightly coloured band on the lower part to increase their visibility to boats. Navigation lights and markings would be installed. Red aircraft warning lights would also need to be installed to meet safety requirements.

To minimise risk to recreational craft, the distance between the maximum sea level (Mean High Water Springs or MHWS) and the blade tip at the lowest point will be more than 22 metres.