46According to recital 8 of Decision 2011/278, the Commission used, for the determination of benchmark values, as a starting point the arithmetic average of the greenhouse gas performance of the 10% most greenhouse gas efficient installations in 2007 and 2008 for which data were collected. It verified that the starting point sufficiently reflected the most efficient techniques, substitutes, alternative production processes, high efficiency cogeneration, efficient energy recovery of waste gases, use of biomass, and the capture and storage of carbon dioxide, where such facilities are available. Subsequently, the Commission supplemented those data by using, in particular, the data collected by or on behalf of the various European sector associations, based on defined rules, so-called ‘sector rule books’. As reference for these rule books, the Commission provided guidance on quality and verification criteria.
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