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The document defines 'resource adequacy' as the availability of all necessary resources—including generation, demand-side resources, and interconnection—to meet electricity demand. It outlines how RAAs can be used by campaigners to argue against the need for coal or gas plants and to challenge the legality of capacity mechanisms. It contrasts the limited, non-binding RAA rules of the 2009 Third Energy Package with the more legally binding framework introduced by the recast Electricity Regulation from 2020, which requires the consideration of interconnection and regional adequacy.