# Boat-to-Grid Electrical Energy Storage Potentials around the
## 2 Materials and Methods
Figure 3: The passenger ports of Lake Balaton, based on [55]. Figure 2: The number of sailing marinas per town/village at Lake Balaton, based on [55]. Figure 1: Location of the study area, based on [55]. The Direction of the Development of the Sailing Marinas at Lake Balaton and Its Connections to Energy Storage Developments  
Figure 2 illustrates well that sailing marinas have a great significance in the shipping activities of Lake Balaton. A part of this study was also the determination of the number of permanent berths and visitors' berths at the sailing marinas of the towns/villages of Lake Balaton, since in possession of this data, the numbers of small electric boats at present and in the future could also be established. The initial data and information for this were provided by the Government Agency of the City of Budapest [57] and the atlas of the ports and marinas of Lake Balaton [58]. Moreover, how large the present and the predicted energy storage capacities of the small electric boats moored in the sailing marinas are has also become a timely question by now. The input information necessary for answering this was supplied by the Government Agency of the City of Budapest [57], AQWIA Ltd. (Balatonfuzfo, Hungary) [59] and Stickl Yachts Ltd. (Gardony, Hungary) [60]. Stickl Yachts Ltd. [60] and AQWIA Ltd. [59] together have a share of 60% of the market of the registered electric boats in Hungary. This study considered the number of berths in the marinas to remain constant in the future, since the construction of further facilities around the lake is unlikely [61] because of environmental reasons, among others [62]. The economic environment that supports the spread of small electric boats is extremely important, since it will contribute not only to the development of the green infrastructure at the lake, but also to the process of these vehicles becoming an organic part of virtual generation integration, local energy communities and micro-grid solutions, in accordance with Hungary's energy strategy for 2030, as these boats can provide a possibility for creating new flexibility services. The development of the present sailing marinas at Lake Balaton is of utmost importance. Based on the characteristics of the region and considering the potentials for future development as well, the main areas for development have been identified: mitigating the imbalances caused by seasonality, ensuring sustainable operation, increasing tourism-related revenue and aligning with the directions of tourism development. These development areas can also facilitate electric marina development constructions. In the sailing marinas of Lake Balaton, a prominent region of tourism development in Hungary, the construction of charging systems for electric watercraft that can serve both sailboats with electric motors and electric boats is underway. Recently, support has been granted to projects aiming at the creation of tourism services of high added value whose main goal is the building of a network that will make it possible for small electric boats to travel all around the whole lake. The charging points integrated into a network are able to ensure optimal capacity utilization by communicating with one another via various applications. A positive outcome of the charging network investments around Lake Balaton is the improvement of the quality of ground services in the marinas. Furthermore, the use of further services during the charging time is likely to increase the revenue of the marinas and other providers of services. Thanks to the developments, collaborations in partnerships and  
Figure 4: The number of anglers’ ports per town/village at Lake Balaton based on [55]. agreements with tourist attractions may generate further growth in revenue and visitor numbers [63; 64]. In the longer run a remarkable increase is expected in the spread of PV systems in Hungary.