The most commonly used method for control over the turbine island efficiency variation is turbine balance test. However, this test requires many various resources and is therefore rarely performed. Besides, such tests are performed for a simplified variant of the cycle that’s why the test results are not suitable for the real operational conditions. For these reasons the balance test can not solve a variety of important problems: - to keep track of heat losses caused by the deviation of the operational parameters from their optimal values and, overall, by an unsuccessful operation of the equipment; - to evaluate the heat losses caused by the equipment degradation which is necessary in order to optimize the start and duration of repair works; - to compare an operation quality of different units with different operational conditions. All the above mentioned problems can only be solved by using the efficiency monitoring systems. But for these monitoring systems to have practical significance the following principal requirements must be fulfilled: - the integral diagnostic factor has to be found; this factor must have a high sensitivity to the turbine cycle efficiency variation as well as to the variation of turbine cycle equipment conditions; - the low uncertainty of the diagnostic factor calculation results has to be provided, the uncertainty value must be sufficiently close to the one of the traditional test results. In the presented paper our experience of operating the online turbine cycle Efficiency Monitoring System is described.

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