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Many business models of power trading systems have been proposed to aim at load reduction by consumers cooperating with electric power suppliers in an electric power market. On the other hand, Web services are regarded as a new application paradigm in the world of the Internet. Then, we propose a network model of power trading systems using Web services in this paper. The adaptability of Web services to power trading systems was checked in the prototype of our network model and we got good results in our simulations. Each server provides functions as a SOAP (simple object access protocol) server, and it is coupled loosely with each other through SOAP. Storing SOAP message in HTTP packet can establish a penetration communication way that is not conscious of a firewall. Switching of dynamic servers is possible by means of rewriting the server point information.