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In recent years, strategic maintenance planning and optimum production management have received rising attention from those who operate in the field of electricity production based on gas turbines. In this context, the knowledge of instantaneous life consumption of Hot Gas Path Parts (HGPPs) is considered as a key requirement for an effective maintenance strategy, thus the application of reliable damage-assessing techniques is essential. According to above, a model concerning the creep damage of high pressure turbine buckets has been developed. Such a model simulates main strain-sources (centrifugal, gas bending and thermal) and radial distribution of blade metal temperatures. The model takes also influence of corrosion into account. The interaction between creep and corrosion has been modelled through a physical reduction of section areas, which causes a corresponding increase in primary stress levels. After having evaluated the equivalent stress through Von Mises criterion and adjusted such a stress according to corrosion actions, the model assesses life consumption by means of rupture curves parameterized on Larson-Miller charts. Through damage modelling, it becomes possible to evaluate the economic implications of components deterioration. Since economic evaluation plays a key role in operational planning, a costing model which includes damage assessment has been developed. Then, the impact of HGPPs deterioration on the planning of the electricity production of a pool of combined-cycle power plants has been studied and results obtained by the numerical simulation have been presented and discussed.