First Wind will add six turbines to the existing Steel Winds project in Lake Erie, New York.

The scheme is expected to enter full construction within the next few weeks, and is planned to produce energy by early 2012.

Preparation started last week for the new 2.5MW Clipper turbines which will join eight machines that began operating in Lackawanna in 2007.

First Wind originally planned to begin construction of Steel Winds II in late 2010, and blades are understood to have been at the site since last December.

The remaining components are scheduled to be delivered in September.