Most industrialized economies depend largely on petroleum energy supplies, and geologic studies of petroleum resources suggest that the global production of petroleum will peak around the year 2000. The Long-Range Energy Alternatives Planning System (LEAP) is designed especially for application in developing countries. It permits the analysis of all the major commercial fuels used in the modern sector as well as the biomass fuels used in the traditional sector. LEAP is a flexible and accessible tool that enables energy planners and decision makers to identify and quantify the long-range implications of energy policy alternatives. The Charcoal Production Model attempts to deal with the economics of charcoal, a critically important component of traditional energy economics. The model computes energy demand for six major sources of energy in nine geographic regions. The energy sources are oil, gas, nuclear, solar, solids such as coal and biomass, and resource-constrained renewables such as hydroelectric power.