This document provides information on basket heating tests for characterisation of self-heating properties of solid biofuel pellet. This document includes: – A compilation of basket heating test methods. – Guidance on the applicability and use of basket heating tests for solid biofuel pellets. – Information on the application of basket heating test data for calculations of critical conditions in storages. Data on spontaneous heat generation determined using this document is only associated with the specific quality and age of the sample material. This document is applicable to solid biofuel pellets only. NOTE – The information derived using this document is for use in quality control and in hazard and risk assessments related to the procedures given in ISO/DIS 20024:2019.