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The increasing amount of application software in power system demands for an effectual software integration pattern. Web services satisfy the requirement. But WSDL and UDDI standards lack the capability of semantic representation. In this paper, we present a semantic description for service based on OWL-S, and design an exactor which gets IPOE information from WSDL/UDDI, propose an architecture SM4PS based on OWL-S and power system domain ontology for service discovery and composition. A prototype of composing service for a provincial power system operation management is shown. [ABSTRACT FROM AUTHOR]