and regulatory authorities, while investors and developers also Abstract-This paper deals with the probabilistic analysis of express their interest, since a high yield can be guaranteed for islanded power systems with connected wind parks comprised by their investment. In the Aegean Sea, there exist 56 nonvariable speed -pitch controlled wind turbines. The analysis is interconnected islands where wind generation is already based on actual load data available from measurements and installed or production permits have been granted. The takes into account the penetration constraints that rise from the conventional generation units and system's safe operation. A integration of a high percentage of wind power into the simple probabilistic approach is used in order to give a more generation system however, poses a number of questions completive picture about the repercussions from the connection regarding the percentage of the capacity provided by the wind of wind parks on the operation of isolated power systems than without degrading seriously the operating performance of the deterministic techniques.power system.Due to the isolated nature of Greek islands, power Index Terms-is d nes,limitations are imposed to the output of wind farms presenting probabilistic analysis, wind turbrines. a number of unique characteristic and special problems. As a