This chart displays that Maine has wind resources suitable with large scale wind power generation. The good and very good wind supply areas are concentrated in two main locations. The first region contains the offshore islands in bays and the Gulf of Maine. The second region contains the ridge crests in the north-central and northwestern section of Maine.

A source of clean energy, wind is categorized by wind power classes, which are based on normal wind velocity. The classes vary from Class 1 (the lowest) to Class 7 (the maximum). In general, at 50 meters , wind speed Class 4 or greater is practical for generating wind power with substantial turbines. Class 4 and over are considered excellent resources. Specific locations in the Class 3 zones could have greater wind power classes at 80 meters than revealed on the 50 meter map as a consequence of possible elevated wind shear. Due to the advances in machinery, a number of locations in the Class 3 zones may proper for utility-scale wind power development.