Law firm Mayer Brown on Tuesday (28 July) said Brazil’s National Agency of Petroleum, Natural Gas and Biofuels (ANP) has launched a 45-day public consultation on proposed revisions to the country’s marine fuel specifications, paving the way for routine use of up to 100% biofuel (B100) in vessels while streamlining biofuel blending requirements : On July 27, 2026, Brazil’s National Agency of Petroleum, Natural Gas and Biofuels (“ANP”) published Public Consultation and Hearing Notice No. 15/2026, for the review of ANP Resolution No. 903/2022, which establishes the specifications for waterborne fuels marketed in Brazilian territory (marine diesel oil and marine fuel oil). The purpose is to incorporate biofuels and renewable fuels into Brazilian waterborne transport, in the context of the energy transition and the International Maritime Organization’s (“IMO”) international decarbonization targets. The proposal (i) aligns national specifications with ISO 8217/2024; and (ii) is encouraged by the progress of IMO discussions on carbon pricing and incentives for new fuels. In terms of market context, operations involving the use of biofuels in Brazilian waterborne transport already exist, such that harmonizing national rules with ISO 8217 and the MARPOL Convention will standardize the regulatory treatment applicable to these operations. The main changes proposed in the draft resolution are as follows. The specification tables for waterborne fuels will be restructured, including classes for fuels containing biodiesel. Limits and test methods from ISO 8217/2024 will be selectively incorporated, on a partial basis, in line with Brazilian market realities. Biodiesel content of up to 100% (“B100”) for regular use in vessels (no longer as an exception), which could be sold directly to the end user. Green diesel (“HVO”) and synthetic/GTL (Gas-to-Liquids) fuels will be treated as “drop-in” components, meaning chemically similar to fossil fuels and capable of replacing th