I don't see why solar in Arizona would not help Maine.

If Maine has a shortage, they aren't going to get power directly from Arizona, but couldn't they get power from New Hampshire? If New Hampshire doesn't have any spare capacity, couldn't they still supply Maine and get some from Massachusetts to cover for what they send to Maine? And if Massachusetts doesn't have any spare, can't they similarly go ahead and supply New Hampshire, making it up with power from whoever is next west of them, ultimately ending up with Arizona's extra solar power allowing Maine to get through a shortfall?