3. Member States may exempt existing medium combustion plants which do not operate more than 500 operating hours per year, as a rolling average over a period of five years, from compliance with the emission limit values set out in Tables 1, 2 and 3 of Part 1 of Annex II.
Member States may extend the limit referred to in the first subparagraph to 1 000 operating hours in the following cases of emergency or extraordinary circumstances:
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for backup power production in connected islands in the event of an interruption of the main power supply to an island,
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medium combustion plants used for heat production in cases of exceptionally cold weather events.
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In all cases set out in this paragraph, an emission limit value for dust of 200 mg/Nm3 shall apply for plants firing solid fuels.