# Smart Meter Gateways: Options for a BSI-Compliant Integration of Energy Management Systems
## 7 Conclusions  
As more and more SMGWs will be installed in Germany in the upcoming years, the topic of EMS and SMGW interaction will become increasingly relevant. Although the solution is currently exclusive to the German market, other countries may follow and implement similar approaches in the future. In this paper, we provide a structured overview of the requirements for German SMGWs that are important for energy management. We also illustrate relevant options to integrate an EMS into _Smart Metering Systems_ in a BSI-compliant way, showing that a local EMS in the HAN, a remote EMS in the WAN, and even combinations of both are possible. Furthermore, we outline key factors that need to be considered when implementing the given options. A major challenge is the access to the latest meter measurements due to the respective requirements, as well as the lack of standardized interfaces. These issues will probably be addressed in the future. TRuDI, for example, is a first step in this direction, allowing to access the _Consumer Interface_ of SMGWs from different manufacturers.  
It is important to understand that the German _Smart Metering System_ only sets the basis for a secure and reliable communication between local and remote entities. Information flows and details regarding CLS control are not defined. Future work may in particular address the balance between a centralized optimization performed by remote EMSs (e.g., operated by distribution grid operators), and a decentralized optimization performed locally (e.g., in buildings). The advancement of regulations regarding DSM incentives and flexibility markets, the optimizations performed by EMSs and their distribution, as well as interfaces of _Smart Metering Systems_ go hand in hand. Consequently, new possibilities for the integration of EMSs into the SMGW architecture may come up in the future. In the presented German regulatory environment, this may be based on either new versions of the BSI technical guideline, or demand-driven SMGW advancements that provide further optional functionality considering the degrees of freedom provided by the relevant specifications.  
[PERSON] and [PERSON] conceived and designed the research; [PERSON] and [PERSON] developed the basic concept from which the options presented in this paper were derived; [PERSON] and [PERSON] derived the presented options, assessed them and wrote as well as polished the paper; [PERSON] helped in the assessment; and [PERSON] provided feedback, supervision, organization of funding and resources for this collaboration. All authors have read and approved the final manuscript.  
We gratefully acknowledge the financial support from the _Federal Ministry for Economic Affairs and Energy_ (BMWi) for the project C/sells (funding No. 03 SIN121).  
The authors would like to point out that two of the co-authors are employed by Power Plus Communications AG, a manufacturer of Smart Meter Gateways. However, this had no impact on the design of the study; the collection, analyses, or interpretation of data; the writing of the manuscript, or the decision to publish the results.