A Solar Power Purchase Agreement (SPPA) is a financial arrangement in which a third-party developer owns, operates, and maintains the photovoltaic (PV) system, and a host customer agrees to site the system on its roof or elsewhere on its property and purchases the system’s electric output from the solar services provider for a predetermined period.

http://www.epa.gov/greenpower/buygp/solarpower.htm

Solar Power Purchase Agreement ( SPPA).  This is a good way to provide solar energy at your home or business with ZERO upfront cost and ZERO maintenance for life time of system.