The application of the Pareto analysis to determine critical component that cause failure and downtime in low pressure (L.P) steam turbine in Sapele power station of the power holding company of Nigeria, Nigeria have been carried out. Component failures and down time data were obtained from the company for a ten years period (1994-2003) were used for the analysis. The Pareto analysis was used to identify those critical components that cause high downtime and failure. It was o observed that Seven (7) components were responsible for about 72% of all lost hours (downtime) in the steam turbine of which Low Pressure Reaction Turbine rotating Blade accounted the highest downtime of 24%. The other critical components were Low Pressure Turbine Rotor, Low Pressure Turbine Segments (H.P. End), Low Pressure Turbine Segments (GEN.End), Shims for Low Pressure Turbine wedges, Lacing wire for Row 8 Rotating Blades and Lacing wire for Row 7 Rotating Blades. It is hoped that management pay adequate attention to the preventive maintenance of these critical component in order to reduce the downtime and failure to the barest minimum and enhance the performance of the turbine for power generation.