I actually had Solar City come down and give me a bid. It was last year, so some mixed notes/thoughts on the whole process.
-- I seem to remember three options. 1 was a 20 year lease, the other was an outright purchase and I can't remember the 3rd. (They sent me a proposal which linked to their website and has since disappeared, so I can't just post it here.)
-- They do recommend a new roof on the house if there are only a few years left on the existing one. They did say that if a new roof had to be put on later, they would come down remove the equipment and reinstall it later. I seem to remember a fee; maybe it was free if you leased and a fee if you owned.
-- If you leased, they were responsible for all upkeep. They all insured the system in case of damage.
-- There was no battery storage. It all fed onto the grid or was consumed in your house. They claimed this was SMECO's doing/fault.
-- When you do this, SolarCity becomes your power provider, not SMECO. You pay SolarCity every month. Any money SMECO pays you for the power you generate goes to SolarCity directly.
-- They showed me an estimated 15% monthly savings. Saving $15-30/mo hardly seemed like the hassle, so I blew it off.
-- You pre-negotiate your kWH rate with SolarCity and that gets locked in for some time period. I seem to recall that there was a way to lock it in for a longer timeframe. If power cost were to double or triple in coming years, this would be a great deal. But who has a crystal ball.
The one thing that annoyed me is they sent a saleswoman down who had little technical knowledge. Their proposal was also full of pretty color graphs, but lacked any technical details. I told them I needed a detailed bill of materials so I could tell if the system and price they were giving me was a good deal, or if I could do better on my own. That never came. Then a few weeks later I got a call from some guy who wanted to know why I never went ahead with their great proposal. So, I told him about the lack of details and the revised proposal that never came, and he assured me he would see what could do---which of course was nothing. Then a few weeks later---you guessed it. Another guy called with the same pitch. I blew off that call and yet one more after that.
Overall, I would say that if you we going to save 40-50%/month on your power bill, it would be the way to go. But for 15% and all of those ugly panels and wires on your house??? I understand that they have to recoup their costs and then make some money. The problem is that solar power equipment is just too expensive at this time.
Here are some videos they sent me:
[video=youtube;qwvuSNcG96w]https://www.youtube.com/watch?v=qwvuSNcG96w[/video]