11. The competent authority may grant a derogation for a maximum period of six months from the obligation to comply with the emission limit values provided for in paragraphs 2 and 7 for SO2 in respect of a medium combustion plant which normally uses low-sulphur fuel, in cases where the operator is unable to comply with those emission limit values because of an interruption in the supply of low-sulphur fuel resulting from a serious shortage.
Member States shall inform the Commission, within one month, of any derogation granted under the first subparagraph.