Increasing the objectivity of comparison and ranking of working efficiency of steam-turbine installations of thermal power-stations' power-generating units under conditions when the accuracy of technical and economic indices (TEI) to be calculated by energy characteristics leaves much to be desired; in other words, the results of TEI analysis are far from objective, and the improvement of analysis techniques of TEI is not only actual but also necessary. Traditionally, the analysis consists of comparison of actual and normal values of TIEs. The discrepancies of these values define the reserve of thermal economy and recommendations ensuring the enhancement of working efficiency of thermal power stations (TPS). Systematic improvement of recommendations' reliability is ensured by experimental clarification of energy characteristics 4 years on average after the major repair of a power-generating unit (PGU). In time, wear leads to increasing the calculation error of rated values of techno-economic indices and amendments taking into account aging. Finally, there comes a point when a manual clarification of rated TEIs becomes economically unsuitable. In accordance with the Rules for Technical Operation, the analysis results of TEIs are needed to ensure the most economical operation of powergenerating units, the development of schedules of repair and adjustment and alignment of power-generating units, the estimation of quality of operational personnel work, and drawing up of accounts on the thermal efficiency. Personnel should solve all these problems, as well as many others, depending on the difference of the actual average monthly and approximate rated values of dozens of TEI. It is proposed, along with the methods of analysis, to apply the methods of synthesis of TEI. The methods of synthesis require overcoming the influence of difference in dimensions, the influence of interrelation of TEI, and the operating conditions of powergenerating units. The possibility for synthesis of TEI manually is practically excluded, since their bulkiness and multiplicity cause a high risk of erroneous decisions. An automated analysis and synthesis system of TEI of thermal power stations' power-generating units was developed. It provides, along with the information support of personnel, methodological support in the form of recommendations for enhancement of working effectiveness of both individual power-generating units and thermal power stations as a whole. The objectivity of these recommendations is undoubted within the framework of initial data.