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A technology assessment of engines, power source and electrical technologies that can meets the needs of the future U.S. Army (“Army 21”) for cost-effective generator sets is made. Considered in this assessment are: diesel engines; stratified-charge, spark-ignited engines; homogeneous-charge, spark-ignited engines; gas turbine engines; and Stirling engines. Direct energy conversion devices including batteries, fuel cells, thermal-to-electric generators, and nuclear powered systems are also considered. In addition, potential advances in electric alternators and power conditioning, applications of networking, and noise reduction methods are discussed for possible application to the Army environment. Recommendations are made for the potential application of the different technologies for the needs of Army 21.