MARPOL Annex VI requires all ships to use fuels with a sulphur content of 0.50% m/m from 1 January 2020 onwards (in Emission Control Areas, other limits apply). The implementation date is subject to a decision by the Parties to MARPOL Annex VI that these fuels are by then sufficiently available. In order to inform this decision, the IMO has commissioned the present study, which aims to assess the availability of fuel oil with a sulphur content of 0.50% m/m or less in 2020.