  Many research projects are devoted to biomass production, selection of new
crops and bio-refinery processes but in comparison, the biomass supply chain to
satisfy the planned demands of refineries are relatively neglected, although it
could constitute the Achille's heel of the system. Indeed, an important
fraction of biomass cost at refinery gates resides in logistic costs. This
paper briefly presents a mathematical model to locate several refineries over a
large territory and optimize their supplies over one year divided into weeks.
Two objectives are minimized: the total cost of the system, GHG emissions, and
energy consumptions.
