Spanish engineering company Siemens Gamesa has won an order from MidAmerican Energy for the Rolling Hills wind power project. With a capacity of just over 429MW, the order will be the largest repowering order in North America.

The company will supply and install 163 SG 2.7-129 wind turbines, operating at 2.38MW, and 18 previously sold SWT-2.3-108 wind turbines to repower the project, with an option for 12 additional wind turbines.

Located in Iowa, the Rolling Hills wind power project currently features 193 SWT-2.3-101 turbines. The repowering project also includes replacement of blades, hubs and nacelles for all units, and top tower sections for the SG 2.7-129 units.

The nacelles and hubs will be brought from the company’s nacelle and hub assembly facility in Hutchinson, Kansas, while the blades will come from the blade manufacturing facility in Fort Madison, Iowa. The project is expected to be commissioned in 2021.

Siemens Gamesa Renewable Energy CEO of onshore Americas José 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 2.6 GW.

“The blades will be produced right there in Iowa and the nacelles and hubs will come from neighboring Kansas, making this a truly local project.”

Siemens Gamesa has installed more than 10,000 wind turbines in the US with a total installed capacity of approximately 20GW. In Iowa, the company has installed nearly 1,400 wind turbines for a total of almost 3.5GW.