Digitizing Citizen Energy Communities : A Platform Engineering Approach

Low acceptance and protests against the increasing expansion of renewable generation capacities by local citizens have repeatedly slowed down the ongoing energy transition in western countries. A promising approach to address this issue is the energy community concept, for which the European Union introduced a regulatory framework within the \u27Directive on common rules for the internal market for electricity\u27. It refers to them communities as Citizen Energy Communities. Within these communities, participants can exchange locally generated energy and the community can be represented by a digital platform, which organizes the community\u27s continuous power distribution and financial flows. In the academic literature, these communities are discussed as a tool to actively integrate citizens into the energy system on a local level. They increase the acceptance by benefiting the local value chain and empower the energy sector\u27s decarbonization. However, there is a lack of research on how Citizen Energy Communities can be implemented in practice and how they perform under real-world conditions. This dissertation’s contribution addresses the empirical challenges in the implementation and long-term operating of Citizen Energy Communities. The thesis reports on six studies. In the first study, the necessary IT architecture and digital building blocks are developed based on a literature review and insights from a real-world implementation for Citizen Energy Communities are described. From the resulting experiences, requirements for the individual building blocks and technologies are deducted. Researchers propose that blockchain technology can accelerate the introduction of Citizen Energy Communities. Therefore, a maturity model for blockchain-based Citizen Energy Community projects is established in the subsequent study, which allows assessing the development status of field implementations and identifying necessary next steps. In the third study, a platform-based allocation mechanism is designed, which addresses heterogeneous preferences of participants and thus enables local prices for different local energy sources. Based on an implementation, the mechanism\u27s performance and functionality are evaluated. Besides the technical functionality, user behavior is of central importance for success. Therefore, seven user interface design principles are deducted in the fourth study based on a structured design science research process with the help of expert interviews and a behavioral laboratory experiment. In the fifth study, it is quantified and evaluated if participants are regularly active within the community, willing to pay premium prices for local renewable sources and whether they are responsive to local price signals as often assumed in the literature. The results show that Citizen Energy Communities need to be tested more thoroughly and that the platform\u27s allocation mechanism require a low complexity or additional support systems like automated agents. As a result, the sixth study evaluates the real-world trading performance of automated agents and their impact on the platform market. The results show that a single agent among human traders can minimize the participant\u27s cost. However, this advantage diminishes with the number of additional automated agents in the market. The thesis is concluded with an outlook and pathway for future research

Designing Local Energy Market Applications

Local energy markets and corresponding information systems are a way to integrate and involve residential customers in the energy transition, which can increase acceptance and drive private investment. This study is focused on the generation of design knowledge for these local energy market user applications in general and specifically to ensure long-term user engagement, which is a crucial success factor to maintain long-term effects. To this end, we derive, instantiate and evaluate seven design principles based on a field implementation with user interaction over 13 months using a design science research approach. The design principles and their instantiations are evaluated based on semi-structured interviews with the participants and a consecutive online experiment. The design principles provide fundamental knowledge for the setup of local energy market user applications and are therefore of value for researchers and practitioners alike

Local energy markets - an IT-architecture design

In recent years, local energy markets have become an important concept in more decentralized energy systems. Implementations in pilot projects provide first insights into different hypotheses and approaches. From a technical perspective, the requirements for the IT infrastructure of a local energy market are diverse, and a holistic view of its architecture is therefore necessary. This article presents an IT-architecture, which enables all basic local energy market functionalities, processes and modules based on the available literature. The proposed IT-architecture can serve as a blueprint for future local market projects as it covers the basic processes and is at the same time extendable. Furthermore, we give a detailed description of a real-world implementation of a local energy market using the described IT-architecture and discuss the advantages and disadvantages of the utilized technologies along with this case study

International Consensus Statement on Rhinology and Allergy: Rhinosinusitis

Background: The 5 years since the publication of the first International Consensus Statement on Allergy and Rhinology: Rhinosinusitis (ICAR‐RS) has witnessed foundational progress in our understanding and treatment of rhinologic disease. These advances are reflected within the more than 40 new topics covered within the ICAR‐RS‐2021 as well as updates to the original 140 topics. This executive summary consolidates the evidence‐based findings of the document. Methods: ICAR‐RS presents over 180 topics in the forms of evidence‐based reviews with recommendations (EBRRs), evidence‐based reviews, and literature reviews. The highest grade structured recommendations of the EBRR sections are summarized in this executive summary. Results: ICAR‐RS‐2021 covers 22 topics regarding the medical management of RS, which are grade A/B and are presented in the executive summary. Additionally, 4 topics regarding the surgical management of RS are grade A/B and are presented in the executive summary. Finally, a comprehensive evidence‐based management algorithm is provided. Conclusion: This ICAR‐RS‐2021 executive summary provides a compilation of the evidence‐based recommendations for medical and surgical treatment of the most common forms of RS