In this final rule EPA is amending the definition of "heating oil" in the regulations for the Renewable Fuel Standard (RFS) program under section 211(o) of the Clean Air Act. This amendment expands the scope of renewable fuels that can be used to show compliance with the RFS renewable fuel volume obligations by adding an additional category of compliant renewable fuel referred to as "fuel oils," produced from qualifying renewable biomass and used to generate heat to warm buildings or other facilities where people live, work, recreate, or conduct other activities. Producers or importers of fuel oil that meets the amended definition of heating oil will be allowed to generate Renewable Identification Numbers (RINs), provided that the fuel oil meets all other requirements specified in the RFS regulations. Fuel oils used to generate process heat, power, or other functions are not included in this additional category of heating oil. All fuels previously included in the definition of heating oil continue to be included as heating oil for purposes of the RFS program. We are also finalizing specific registration, reporting, product transfer document, and recordkeeping requirements applicable specifically to these fuel oils, necessary to demonstrate that the fuel oil volume for which RINs were generated was or will be used to heat buildings for climate control for human comfort prior to generating RINs. The final rule is being adopted with only minor changes from the rule proposed on October 9, 2012, and responses to public comments are provided.