2. The Commission shall, where appropriate, adopt delegated acts in accordance with Article 29 to supplement this Regulation by establishing a list of chemical production processes for which the use of ozone-depleting substances listed in Annex I as feedstock shall be prohibited on the basis of the technical assessments carried out under the Protocol, in particular the quadrennial reports prepared by the assessment panels under the Protocol, that include assessments of available alternatives to existing feedstock uses and of emission levels of existing feedstock uses.