## 1 Introduction  
Energy demand in the world continues to rise at an alarming rate. The International Energy Outlook 2017 (IEO2017) projects a 28% increase in world energy consumption between 2015 and 2040 [1]. The current demand is largely met by petroleum, coal, and natural gas. However, the exploitation of these non-renewable energy sources results in pollution of the natural ecosystem, global warming, greenhouse gas emissions, and other harmful environmental effects. Thus, the energy usage is shifting from non-renewable to renewable energy sources. Furthermore, to manage the fast-growing demand, the provider-consumer unidirectional model is transforming into a bidirectional energy and information model. To support this transformation, the use of digital communications in the energy network is proliferating, giving rise to the smart grid concept. The smart grid is defined as \"an electric system that uses information, two-way, cyber-secure communication technologies, and computational intelligence in an integrated fashion across electricity generation, transmission, substations, distribution and consumption to achieve a system that is clean, safe, secure, reliable, resilient, efficient, and sustainable [2].\" It is increasingly becoming popular due to its desirable characteristics and potential promise which includes self-healing, improved reliability, enhanced power quality, moderated peak demand, increased asset utilization, reduced transmission congestion costs, increased security, and improved resistance to malicious attacks or unfavorable natural events [3]. Smart grids differ from traditional utility grids, where consumers use energy from the utility provider and are charged based on their consumption. On the other hand, in the smart grid, energy users may generate, store, or trade energy with other users in the grid [4]. The smart grid framework consists of five main elements that enable seamless energy sharing [5]. These include smart energy and information infrastructures, bidirectional communication, advanced management systems, standards and legislation, and sustainable integration with prosumers [5]. This paper revolves around the fifth element, that is, sustainable integration with prosumers, because numerous studies covering the first four elements already exist in the literature. Reference [6] was one of the first thorough studies in the area of prosumer based smart grids. Hence, we used this reference as a starting point for this systematic literature review. It also introduced the concept of prosumer community groups (PCG) referring to a community of prosumers generating and sharing energy [6]. In the recent literature, a similar concept is described using new terms such as Electricity Prosumer Communities, Integrated Community Energy Systems, and Clean Energy Communities. However, in this paper, we refer to such concepts as PCG. In this study, we aim to understand how the research on prosumers and PCGs has progressed in recent years. As a starting point, we gathered eleven articles [4; 5; 6; 7; 8; 9; 10; 11; 12; 13; 14] on PCGs. We then used Google Scholar to find the citations of these eleven papers, and as a result, we collected 179 papers. These papers were exported to Endnote software to remove duplicates, which resulted in 113 papers for further screening. We screened these articles to select relevant research focusing on prosumer based smart grid management. While doing this, we first checked the title of the paper. If the title did not appear to be about prosumers or smart grids, we read the abstract to determine if the research was relevant to our study. We evaluated the updated list and noticed two areas of interest namely PCGs and prosumer relationships. We then searched additional articles that are closely related to these two themes by querying Web of Science, Scopus, and Google Scholar databases. This process ensured the rigorousness of our research. In total, we selected 105 articles for this systematic literature review.