The World Energy Council Commission's report Energy for Tomorrow's World was published in September 1993.(I) The Commission's three year study of world energy problems involved bath bottom-up studies, undertaken by groups of experts in nine main regions of the world, and cop-down studies of global aspects, The latter included the preparation of energy demand and supply projections up to the study horizon of 2020, together with a brief look at prospects up to 2100. This Paper is based on the Commission's work.