PNE's proposed plants are the first to come out of the agreement. The company said it will start the official planning process for two sites in Perth & Kinross and one site in Argyll and Bute, in tandem with the FCS. The company said it is unable to reveal the size of the individual projects.
A spokesperson for the FCS said: "Developments on the national forest estate will always be carried out in a manner sensitive to the environment and all projects will go through the full planning process.
"There is plenty of potential to develop wind energy projects on the national forest estate and a key aim is to ensure that communities across Scotland benefit too."
On the issuing of the lots in 2011, the companies agreed to pay £5,000 per MW of installed capacity per year to a fund for the benefit of communities near to any developments.
The areas are:
- Lot 1 - South-west Scotland covering Dumfries & Galloway and Arran - ScottishPower Renewables.
- Lot 2 - Central Scotland, covering Stirlingshire, Cowal, the Trossachs and Tayside - PNE Wind UK.
- Lots 3 and 5 - West and North-west Scotland, covering West Argyll, Lochaber, Invernesshire, and the Northern Highlands - E.ON Climate & Renewables UK Developments Ltd.
- Lot 4 - North-east, covering the Grampian area - Fred Olsen Renewables.