There are 4 ways to get solar. Loans, PPA, Lease, or Cash
PPA is short for Power Purchase Agreement. A customer who signs up for a PPA agrees to pay for the production of the solar system monthly. (No tax credit)
Lease- Customers pay a fixed amount monthly for the expected amount of production of their solar system will produce in a year.  (No tax credit)
Financed- You can finances the system anywhere from 5yr up to 25yrs.  The interest rate is as low as 1.5%  (Eligible for a tax credit)
Cash– You can pay cash for a system and own your energy at any time. (Eligible for a tax credit)