In 2012, Perennial partnered with Duke Energy Renewables under a 50-50 joint ownership arrangement for two wind farms in Kansas: the 131 MW Cimarron II Wind Power Project located in Gray County and the 168 MW Ironwood Wind Power Project located in Ford and Hodgeman Counties.

Cimarron II utilizes 57 Siemens SWT-2.3-93 turbines while Ironwood utilizes 73 Siemens SWT-2.3-101 turbines. Both facilities are part of the SPP ISO, with their Point of Interconnection located on the Holcomb-Spearville 345kV transmission line. Perennial has a significant role in the project management of both wind projects which have long-term contracts to sell their generated electricity.

Capacity: 169 MW
Technology: Siemens 2.3 MW
COD: Sept 2012
Partner: Duke Renewables
Market: SPP
Project Share: 50%