It depends. In the southwest, peak is noon to 6 PM and these systems are reliable in 330 days of sunshine per year.
On the east coast, not so much.
The customer pays 80% via the lease, the utility 20% is typical. Whether the 20% is worth it from the utility's point of view is questionable. It depends on assumptions regarding electricity inflation and value of money.
At least it is voluntary for the customer.
The impact on all customers because the utility is forced to rebate some cost to some customers is the question.
The southwest is not a bad place for solar, but solar city advertises all over the east coast. Their ads are misleading implying that you gain independence from the grid (then they caveat that the grid is there “when you need it”) Yeah, it’s there “when you need it” to pay too much for your power. One thing I noticed about the states they do business in is they are mostly green leaning so they can persuade the utility regulators to give them a sweet deal for politically correct electrons.