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Article 32 of the industrial emissions Directive (2010/75/EC) provides for the establishment of a transitional national plan (TNP) for emissions of sulphur dioxide, nitrogen oxides and dust for certain existing large combustion plants.

Within the period 1 January 2016 to 30 June 2020, plants placed in the TNP will be exempt from the emission limit values (ELVs) which would otherwise apply under Article 30(2) of the Directive. But they will each need to comply with an annual 'ceiling' emission for each of the pollutants concerned.

As participation in the TNP is optional, DEFRA, the Scottish Government and the other devolved administrations have released a letter to large combustion plant operators. This letter asks whether and on what basis operators wish the large combustion plant(s) under their control to be included in the United Kingdom's TNP and seeks responses as soon as possible (by the 8th of May at the latest).