It is estimated that as much as another 1.2 GW of capacity remains available to exploit, mostly in the form of micro and small-hydro developments such as those in Knoydart and Kingussie. In reality, environmental constraints and given that the most easily available catchment areas have already been exploited it is unlikely that the full 1.2 GW will exploited. The 100 MW Glendoe Project which opened in 2009 was the first large-scale dam for almost fifty years but is likely to be one of the last of its kind.