The Transitional National Emission Reduction Plan (TNERP) for the period Article 32 of Directive 2010/75/EU) requires the linear reduction (between 2016 and 2019) of the total annual emissions of the units included in it (for SO2 and particles), enabling for gradual implementation of the necessary environmental investments in them, while for NOx emissions, compliance is required from 01.01.2016.