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The work presented in this paper details the methodology applied to inventory and estimate the power losses in a micro-turbine with counter-rotating runners. The separation between the impact of design parameters and operational parameters on each identified source of power loss provides an efficient framework for optimal design of a family range of standard turbines. The qualitative inventory can be used at early stage of the design for specification purpose while the quantitative aspect can serve for optimizing the system accounting for all the loss sources.