However, not all forms of renewable policy create the same system effects and economic distortions. This section takes a look at the different existing regulatory frameworks for promoting renewable energies and their impact on the working and outcome of electricity markets. Despite the benefits of a more unified European support scheme that would mitigate market distortions in and across countries currently a host of national regulatory frameworks prevail (see Table 5.1 and IEA, 2008). As certain technologies such as wind achieve higher levels of maturity, certain support schemes such as feed-in tariffs become less suitable. There is also a link between overall market design and renewable support schemes.