NOVELTY - The method involves measuring properties of vicinity of a storage location by a measuring device (1) and moisture content of biofuel stored in the storage location by another measuring device (2). Measurement result of the moisture content and measurement results of property of close vicinity in a mathematical model for estimating energy content of the biofuel are entered. The mathematical model for determining estimate on the energy content of the biofuel is run on basis of the moisture content of the biofuel stored in the location and the property of the vicinity.    USE - Method for optimizing time of transportation or use of biofuel i.e. fuel wood (claimed), stored in a storage location. Uses include but are not limited to free length wood, bark, wood chip, logging residue, stump piece, crushed stump and small-dimensioned wood in a forest, a field, a road and a storage area i.e. terminal storage.    ADVANTAGE - The method enables measurements on the vicinity of a biofuel storage to be taken at a storage location, thus improving reliability of the measurements. The method enables reducing the content of water carried entrained in the biofuel, thus reducing cost of transportation of the biofuel. The method enables optimizing the time of storage or transportation of the biofuel, thus avoiding unnecessary transportation or burning of a water in the biofuel. The method enables determining the energy content for a supply chain to operate in a cost-efficient way, thus delivering the biofuel in a reliable manner on basis of accurate data.    DETAILED DESCRIPTION - The measuring device is selected from a group consisting of a fuel wood measuring device, remote readable measuring device and a storing measuring device. An INDEPENDENT CLAIM is also included for a system for optimizing time of transportation or use of biofuel.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of a system for optimizing time of transportation or use of biofuel.    Measuring devices (1, 2)    Data (3)    Control system (4)