This book offers novel ideas for solving power system reliability estimation problems by the way of providing scalable and enhanced remote services in a heterogeneous environment. An innovative and comprehensive strategy has been implemented for power system reliability data representation, which is capable of accessing power system data from any data source and converts them into a common format using pre-defined XML document template. An XML annotation scheme is adopted for power system reliability data generation service. The XMLised representation of power system data offers reliable data exchange between legacy power system applications.