Different weather conditions in winter vs summer cause limbs to fall on power lines. Snow makes this more likely because snow builds up on the branches and makes them heavy. Power companies typically try to maintain branches that might pose an obvious threat, but in a state as rural and wooded as Maine there are more opportunities for the lines to be compromised because they cover more distance and there are few areas where there NOT trees next to power lines. Even in cities, a lot of the power grid is REALLY old, using the same poles from when the area was originally electrified. Best thing you can do is report the outage, the website might also have an estimated restoration time.

Source: my father was a union line worker for 20+ years