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Under Frequency Load Shedding, UFLS, is the last step and the most extreme in protecting electric power systems from black outs and severe damages. Adaptive UFLS methods using df/dt are unreliable. SCADA is too slow to achieve a proper protection of the power system under severe over load condition. This paper presents an adaptive under frequency load shedding using phasor measurement unit ,PMU, AUFLS, method depends on power measurement using the advantage of high speed wide area protection system. The simulation results demonstrate a considerable advantage to improve power system stability.