The German group willsupply its 3.6MW turbines, a transformer platform and 15 years-worth of serviceto the wind farm in Nantucket Sound south of Cape Cod, Massachusetts.

Siemens is not currently releasing the number of turbines involved in the agreement, said a spokeswoman for the company in the US.

Cape Wind hasa nameplate capacity of 468MW, representing 130 of the turbines, and has so farsecured power purchase agreements equivalent to 77.5%