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A thorough analysis of the pattern of energy flow and usage in typical large turbine-generator systems was made with the objective of determining those loss areas which are affected by tribological events. Carrying out the analysis in the framework of the energy consumption pattern of the USA, it was concluded that improvements in the areas of bearings and seals on the main T-G unit and similar areas on the accessories could reduce national energy consumption by about 0.5 %. Even more important seems to be the finding that the influence of better tribological design on the overall reliability of the plant system is significant, and can result not only in 0.1 to 0.2 % energy savings but can 44also reduce total plant investment due to increase in availability of the generating unit.