Feed-in tariffs are considered necessary to promote renewable energy sources in the early stages of development, when production is often economically unenforceable. Feed-in tariffs generally include long-term agreements and prices related to the costs of producing the energy involved. Long-term contracts and guaranteed prices protect producers from some of the risks associated with renewable energy production and encourage investment and development that might otherwise not take place. In many FIT systems, UC investors are also eligible for additional premium payments (i.e. an increase in the basic FIT) for the use of certain biomass-based fuels (e.g. B of manure), cogeneration, repowering older recompagine facilities, providing additional services for the electrical grid or specific innovative applications (z.B. improved geothermal systems). On the one hand, these bonuses can be useful in achieving certain political objectives (for example. B technological innovation) and, on the other hand, they increase the costs of the aid scheme. The repurchase compensation guidelines and the SPRPs differ, as the RPS mandates provide for the level of customer demand that must be met by a renewable energy supply company, while a properly structured food compensation supports new renewable energy supply projects by ensuring investor security in terms of returns and long-term contractual structures.
Since the beginning of 2009, few states have adopted the buyback tariff policy, including California and Washington. Several distribution companies in the United States have also implemented incentive policies based on fixed-price production that can be considered feed-in tariffs. About 14 states are currently considering a right of buy-back and a federal feed-in tariff has been proposed. On 20 September 2014, the Ministry of Electricity announced the new buy-back (FIT) remuneration for electricity generated from new and renewable energy sources for households and private sector enterprises.  The FIT is applied in two phases, the official application date of the first phase is 27 October 2014 and the second phase, which is to be applied after two years from the first phase (launched on 28 October 2016). Since 2019, feed-in tariffs have been introduced in more than 50 countries, including Algeria, Australia, Austria, Belgium, Brazil, Canada, China, Cyprus, Czech Republic, Denmark, Estonia, France, Germany, Greece, Hong Kong, Hungary, Iran, Ireland, Israel, Italy, Kenya, Republic of Korea, Lithuania, Luxembourg, Netherlands, Malta, Pakistan , Portugal, Spain, Switzerland, Tanzania, Thailand, Turkey and the United Kingdom.  In early 2012, Rajoy`s government in Spain suspended the feed-in tariff for new projects.  The European Union does not necessarily exploit or encourage feed-in tariffs, which is the responsibility of the Member States. On June 2, 2008, Israel`s municipal authority authorized a feed-in tariff for solar installations. The tariff is limited to a total installation of 50 MW for 7 years, depending on what is achieved first, with a maximum of 15 kWp installation for residential buildings and a maximum of 50 kWp for commercial.
 The bank proposed 10-year loans for the installation of solar modules The National Ministry of Infrastructure announced that it would increase power compensation for medium-sized solar power plants from 50 to 5 megawatts. The new tariff system prompted solar company Sunday Solar Energy to announce that it would invest $133 million to install photovoltaic solar installations on kibbouzim, which are social communities that share revenue among their members.  Although CRF was raised outside, crF had little effect, as the total amount of “additional” costs to the system was capped. Since about 2009, no projects have been funded.