Section 490.303 - Who must comply(a) Except as provided by paragraph (b) of this section, a covered person must comply with the requirements of this subpart if that person is- (1) A covered person whose principal business is producing, storing, refining, processing, transporting, distributing, importing or selling at wholesale or retail any alternative fuel other than electricity; or(2) A covered person whose principal business is generating, transmitting, importing, or selling, at wholesale or retail, electricity; or(3) A covered person- (i) Who produces, imports, or produces and imports in combination, an average of 50,000 barrels per day or more of petroleum; and(ii) A substantial portion of whose business is producing alternative fuels.(b) This subpart does not apply to a covered person or affiliate, division, or other business unit of such person whose principal business is-(1) transforming alternative fuels into a product that is not an alternative fuel; or(2) consuming alternative fuels as a feedstock or fuel in the manufacture of a product that is not an alternative fuel.