Residual mix represents the attribute profile (the renewable status of procured energy) left after certificate retirements remove tracked generation from regional pools. Calculated annually by organizations like AIB (European Attribute Mix), DESNZ (United Kingdom's Residual Mix Data), Green-e (North American residual mix methodologies), these organisations use the residual mix to, in-effect, assign market-based emissions factors to those who consume electricity, yet who do not retire certificates.

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‍Residual Mix is not to be confused with the grid-average emissions factors used in location-based reporting.