<P> Performance - based rates give incentives to producers to maximize the output and efficiency of their project . </P> <P> As of 2010, feed - in tariff policies had been enacted in over 50 countries, including Algeria, Australia, Austria, Belgium, Brazil, Canada, China, Cyprus, the Czech Republic, Denmark, Estonia, France, Germany, Greece, Hungary, Iran, Republic of Ireland, Israel, Italy, Kenya, the Republic of Korea, Lithuania, Luxembourg, the Netherlands, Pakistan, Portugal, South Africa, Spain, Switzerland, Tanzania, Thailand, Turkey and the United Kingdom . In early 2012 in Spain, the Rajoy administration suspended the feed - in tariff for new projects . </P> <P> In 2008, a detailed analysis by the European Commission concluded that "well - adapted feed - in tariff regimes are generally the most efficient and effective support schemes for promoting renewable electricity". This conclusion was supported by other analyses, including by the International Energy Agency, the European Federation for Renewable Energy, as well as by Deutsche Bank . </P> <P> A feed - in tariff can differentiate on the basis of marginal cost . This is a theoretical alternative which is based on the concept of price differentiation (Finon). Under such a policy the tariff price ranges from some level slightly above the spot rate to the price required to obtain the optimal level of production determined by the government . Firms with lower marginal costs receive prices on the lower end of the spectrum that increase their revenue but not by as much as under the uniform feed - in tariff . The more marginal producers face the higher tariff price . This version of the policy has two objectives . The first is to reduce the profitability of certain production cites . </P>

What is the current solar feed in tariff