Results of efficiency measurement at two units equipped by doubled Pelton turbines in the Castelpietra power plant near Fiera di Primiero in Dolomites, Italy has been handed over to the the customer (Gruppo ACSM, S.p.A.) at beginning of April.  The Turbine efficiency measurement was made using a thermodynamic method, measuring of the generators efficiency was carried out by the calorimetric method. The customer ordered the measurements to decide whether to upgrade the machine.