Critical examinations of long-range energy forecasts show a remarkable extent of individual and collective failure in predicting actual developments in five distinct areas examined in this article: major energy conversions, primary energy requirements, sectoral needs, exhaustion of energy resources, and energy substitutions. This experiences demonstrates that we should abandon detailed quantitative point forecasts in favor of the decision analysis or contingency planning under a range of alternative (exploratory as well as normative) scenarios. (C) 2000 Elsevier Science Inc.