Yes, this ID will be necessary to complete the CDX registration process. You may look up your company ID number at http://epa.gov/otaq/regs/fuels/rfs-list.xls (in Excel spreadsheet format).
Question and Answer was originally posted at http://www.epa.gov/otaq/renewablefuels/420f07041a.pdf
Does a plant have to have their EPA-issued company ID number before they register for CDX?
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