I believe they will sell you a system outright and they had a long term financing option called "MyPower" but I think that's been stopped. They sold bonds to cover those loans.
The lease is probably the most popular. Until there is some sort of expandable DIY option that you can gradually grow out, I think the only really popular way to sell these systems will be either baked in to the mortgage or with leases and creative financing. The lease and financing does seem to frighten a lot of people though, SolarCity modeled loan payments off energy use and in the contract there is even a clause that says if there is a prolonged non-sunny period, you might owe a large chunk on the loan when it comes due...
The lease is probably the most popular. Until there is some sort of expandable DIY option that you can gradually grow out, I think the only really popular way to sell these systems will be either baked in to the mortgage or with leases and creative financing. The lease and financing does seem to frighten a lot of people though, SolarCity modeled loan payments off energy use and in the contract there is even a clause that says if there is a prolonged non-sunny period, you might owe a large chunk on the loan when it comes due...