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The Analytic Hierarchy Process (AHP) method is used to prioritize plant assets according to their criticality. The Analytic Hierarchy Process (AHP) method allows the decision makers to model the problem into hierarchical structure with relationship between goal, objectives and alternatives. This paper describes an application of Analytic Hierarchy Process (AHP) applied for identification of critical equipments of thermal power plant. For this AHP based analysis, four criterion are considered for criticality analysis viz. Effect on failure of equipment on power generation, environment and safety, frequency of failure and Maintenance Cost. The major equipments of thermal power plant have considered for this study viz. Turbine, Generator, Induced Draft fan, Forced Draft Fan, Primary Air fan, Boiler feed pump, Cooling water pump, Condensate Extraction Pump, HT motors of mills.