It isn't that simple though. Look at the list of people opposing the project, there are some strange bedfellows. Also, as I mentioned in a previous post, Hydro-Quebec isn't exactly an innocent, clean energy producer.
Here is a link to the Natural Resources Council of Maine's take on how environmentally friendly Hydro-Quebec is.
https://www.nrcm.org/news/hydro-quebec-offers-misleading-claims-powers-climate-impact/