I wish solar installations were so common that we could move past of tallying how much solar power each state has installed as a sort of virtuous race but we’re not. Still, it has progressed: I can remember tallying it town by town, because it was so rare.
As is shown by the above chart from the federal Energy Information Agency, Vermont and Massachusetts remain the per-capita leaders in the Northeast. new Hampshire is somewhat of a laggard, although not as feeble as Maine.
As far as climate goes, of course, none of this really matters unless it is displacing fossil fuel-fired electricity, rather than just slowing its increase. I see no evidence of that happening.