New England is all part of one electric grid, and shares a single grid operator and power market (ISO New England). You can look at individual states' power generation, but a lot of power gets exported between New England states so it doesn't paint an accurate picture (e.g. Vermont's in-state generation is almost 100% renewable (including biomass), but it imports 75% of its power so it ends up being very inaccurate).

Massachusetts also imports about 75% of its electricity from surrounding areas, so looking at just in-state generation doesn't paint an accurate picture either.