The proposed development lay partly within, and adjacent to, the Flow Country World Heritage Site (FCWHS).
It would have been located on the western side of Strath Halladale on land south of Melvich in Sutherland.
The application was submitted a couple of months prior to the area being formally nominated as a candidate for the status.
That was ultimately secured as it was considered “the most outstanding example of an actively-accumulating blanket bog landscape”.
A public inquiry was held over the energy park proposals which ultimately led to a recommendation to turn down the plans.
Scottish ministers agreed that “significant detrimental effects” had not been adequately addressed and the application should be refused.