Siemens Gamesa is to supply turbines to MidAmerican Energy Company for the over 429MW repowering of the Rolling Hills wind farm in Iowa.
The deal covers 163 2.7-129 and 18 previously sold 2.3-108 machines totalling 429.3MW.
Rolling Hills is located in Adair, Adams and Cass counties and currently features 193 2.3-101 turbines.
Repowering will include replacement of the blades, hubs and nacelles for all units, and top tower sections for the 2.7-129 turbines.
Commissioning is expected in late 2021.
Siemens Gamesa onshore Americas chief executive Jose Antonio Miranda said: “We are excited to provide upgraded equipment and technology to the Rolling Hills project in Iowa, a national leader in the wind energy industry.
“This new project is a testament to MidAmerican Energy’s confidence in us as well as Iowa, where we have supplied them with more than 2.6GW.
“The blades will be produced right there in Iowa and the nacelles and hubs will come from neighbouring Kansas, making this a truly local project.”