Rolling Hills is located in Adair, Adams and Cass counties in Iowa and currently features 193 SWT-2.3-101 turbines. The repowering project includes replacement of the blades, hubs and nacelles for all units, and top tower sections for the SG 2.7-129 units. Commissioning of the project is expected for late 2021.

The SG 2.7-129 turbine builds on the robust and successful 2.3 MW geared product series.