I suppose they wouldn't really pay for your storage, but being able to pay you to discharge into the grid would create an incentive for people to buy their own solar + battery storage.
Otherwise you are correct. There is a lot of room for solar, but who is supposed to pay for it? We have a lot of roof top access as well (65k square feet), and the costs simply don't line up for payback. Unless the government subsidizes it a lot more than they currently are, hard to see how it works.
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