in addition irena estimates that about of ukraine s renewable energy potential is in biomass where most biomass operations could be undertaken by agricultural companies a commission establishes the level of green tariffs the feedin tariffs are paid both to new and existing renewable energy plants the tariff system was revised in july reducing the level of tariff for solar which had been among the highest in the world establishing a fairer system of quarterly euroindexation and restructuring the local component requirements moving to a bonus rather than a mandatory requirement which had been acting as a barrier to investment the revised tariffs are listed in table