This paper presents a pre-feasibility study for a proposed demonstration wind farm of about 6 MW in Zwara, 125 km west of Tripoli. This study is based on previous work, which will be modified according to the latest developments in wind energy converter system sizes. It includes an economic evaluation for this project based on different assumptions for the financial parameters. RETSceen software was used for the economic evaluation of this demonstration project. Three different sizes of WECSs (0.6, 1 and 1.5 MW) were studied as candidate sizes to be proposed for this demonstration wind farm. The pre-feasibility study indicated that the project is economically feasible for the three cases. (C) 2002 Published by Elsevier Science Ltd.