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 and iea as certain technologies such as wind achieve higher levels of maturity certain support schemes such as feedin tariffs become less suitable there is also a link between overall market design and renewable support schemes