Unsubsidized PV: The vast solar resources of mature solar markets such as Spain and Italy may not be enough to ensure the viability of big PV projects conceived for the spot market of the private power purchase agreement (PPA) sector, because diversified portfolios and sophisticated financial models are key for their bankability. European solar association SolarPower Europe has already identified several different business models, but the standardization of these models and the contracts for the supply of power are poised to increase as more volume is deployed.
