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What is the difference between a lease and a PPA? Leases and PPAs are fairly similar just with one huge difference: with a solar lease, you are paying a fixed month-to-month payment for the solar panels and the system equipment, and with a PPA, you are just paying for the solar power produced by the solar panels, which will differ from month-to-month. Both choices will help you lower your expenses, but availability varies by city and state.