An onsite solar PPA is a contract between a developer and a customer with suitable space to install a solar PV system. The developer installs and maintains the solar PV system for a fixed term and sells the electricity to the customer at a tariff much lower than the grid. The customer pays no upfront costs (CAPEX) for the solar PV system and enjoys the savings, energy security and sustainability of solar power delivered at a fixed tariff. The customer only pays for the energy actually produced by the plant. Hence the incentives of both parties are fully aligned.