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To meet future world energy demands, the engineer’s task will be to develop, through research, means of supplying new sources of energy. Though nuclear processes and solar energy will provide future energy, they are not readily adaptable to portable power systems due to inherent shortcomings. Energy can be supplied to portable power systems by energy storage systems using chemical, mechanical, or electrical forms, or it may be supplied through energy-in-transit systems. Technical discussion of various systems is presented. To develop suitable energy storage systems, thought must be given to problems of construction, operation, maintenance, and economics. Research is necessary to determine which chemical fuels are most adaptable for internal combustion engines.