The paper deals with characteristic and evaluation of support mechanisms for the promotion renewable energy sources (RES). The two main mechanisms price system and quota system was introduced in first part of paper. In price system government determine the electricity prices paid to the renewable producer and lets the market to determine the quantity of renewable energy, in quota system government determine the quantity of renewable electricity and leaves it to the market to determine the price of renewable energy. All variant of measures of each system is presented in latter part of paper. In second part of paper Feed in Tariff (FiT) and Tradable Green Certificates (TGC) was introduced and evaluated. Those mechanisms are methods of creating a protected market, separated from the open electricity market where electricity from renewable energy sources would have difficulties competing with existing, subsidized and already depreciated conventional (fossil-based) power plants. The first mechanism (FiT) is price system based, and second (TGC) quota system based. FiT is utilized in most of European Union countries (18) and TGC in 6 countries, at rest countries of UE there is other system implemented (tax incentives and subsidies). Both systems have a pros and cons - which was introduced in article too - and its efficiency depends on many individuals factors. In comparison to TGC system, FiT system perform better and its more effectiveness as shown analysis.