New stationary sources 11 . In Bulgaria , Croatia , the Czech Republic , Denmark , Finland , Germany , the Netherlands , Romania , Slovakia , Slovenia and Spain limit values for SO2 emissions from new stationary sources varied between 5 milligrams per cubic metre ( mg/Nm3 ) ( for liquefied gas ) to 850 mg/Nm3 ( for solid and liquid fuels in power plants of 50 - 100 megawatt thermal ( MWth ) ) , well within the limits set in annex IV to the Gothenburg Protocol .