Everyone in the Netherlands producing energy from solid biomass and consquently eligible for an SDE+ subsidy must anually demonstrate this solid biomass meets the legal sustainability criteria. The Netherlands Enterprise Agency (RVO) website tells you which types (Dutch) of solid biomass these sustainability criteria apply to. The Dutch Emissions Authority (NEa) is the public regulator monitoring compliance with these sustainability criteria since 1 January 2018. Througout 2018, a transitional arrangement for these criteria was in effect.