Inthispaper,anewapproachbasedonhybridParticleSwarm-Based-SimulatedAnnealingOptimizationtechnique(PSO-B-SA)isproposedforsolvingunder-voltageloadshedding(UVLS)problem.Undervoltageloadshedding(UVLS)isoneofthemostimportanttoolsforavoidingvoltageinstability.Inthis