Studies performed by several Brazilian institutions concluded that liquefied natural gas (LNG) could be the best fuel to generate electric power in some non inter-linked networks in the Brazilian Amazonas Region. Based on this assumption, a non-linear model was developed to optimise the LNG supply for such systems in the State of Para. Some properties of the problem allowed a successive linearisation strategy to solve it. The results obtained show that the proposed model is very efficient for optimising LNG supply systems in such cases. (C) 1999 Elsevier Science Ltd. All rights reserved.412153161