The Lochluichart project will use 17 Siemens SWT-3.0 101 direct-drive turbines. Additionally, the agreement includes a 15-year service agreement.
It is Eneco's largest UK wind investment to date.
The project will be installed on the Lochluichart Estate and is due to be constructed at the end of the year. Installation is set for Q1 2012.
Eneco said it is setting up a community scheme around the wind farm. The company said it will fund £2,750 per megawatt installed to local projects.
The SWT-3.0 101 is the first direct-drive turbine to be developed by Siemens. It was launched at EWEA last year.
The turbine, which has a 3MW capacity, will principally be available for onshore wind farms. Siemens claims it has a lower weight and half the parts of one of its 2.3MW products.