“…Electricity production support mechanisms in EU member states differ in terms of renewable energy source types (for biogas (BG), biomass (BM), hydropower (HY), solar energy (SO) and wind energy (WI)), in terms of support mechanisms (subsidies, grants, loans, procurement tariffs, premium tariffs, quota system, tax system), and financial rules (support rules and amounts). There are countries that support the use of only one of solar energy, hydropower, or wind energy, but there also are countries, that support all types of renewable energy sources [7]- [9].…”