Last month Maine's Department of Environmental Protection (DEP) informed First Wind of its “concern” regarding the financial structure of several of its projects in the wake of a recent ruling by the state’s highest court.

One of the projects – Oakfield, which will employ 48 Veasts V112 turbines – is already under construction.

At the heart of the matter is the 2012 joint-venture formed between First Wind, a Boston-based wind developer, and Emera, a Canada-based electric utility, and owner of Nova Scotia Power.