A RIN assigned to a volume of renewable fuel is separated by the party that owns that volume of renewable fuel at the time of blending. If a downstream customer is the owner of the volume of renewable fuel when it is blended into gasoline or diesel, he will own the separated RINs and be subject to all the registration, recordkeeping, and reporting requirements. In the case of a blender and a downstream customer who might both lay claim to the right to separate any assigned RINs, these two parties would need to come to agreement between themselves regarding which party will own the separated RINs.
Question and Answer was originally posted at: Questions and Answers on the Renewable Fuel Standard Program (PDF) (55 pp, 221 K, EPA420-F-07-041a, August 2007, About PDF)