In the future Smart Grid, numerous stakeholders within the electric power grid need to exchange information in order to realize applications like customer energy feedback, billing and invoicing of variable tariffs, demand side management and efficient charging of electric vehicles. Using a Service-oriented Architecture (SOA) based on Web services promises a convenient way to provide a data infrastructure capable to realize the required interactions in a flexible way. A main concern in such an

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... chitecture is how access to data can be controlled in order to prevent security or privacy violations. Access control depends strongly on authentication and authorization mechanisms. Therefore, this paper contributes i) a SOA for the Smart Grid and ii) an access control mechanism that is taken into consideration from the early beginning of the system design. Furthermore, a proof of concept implementation and a scalability analysis are used to investigate the requirements on computational resources in a large scale deployment. Facilitating a SOA based on Web services allows to build a flexible integration layer that makes it possible to reuse existing information sources for a variety of application scenarios. Key concerns within such an information infrastructure are security and privacy. Smart meter values tracked and transmitted in a high temporal resolution offer a detailed insight into the daily life of a household and allow to profile individual behaviour patterns [3]. Therefore, in this