# Ranking of Electricity Accumulation Possibilities: Multicriteria Analysis
## 5 Conclusions  
The accumulation of renewable electricity serves as the primary catalyst for advancing a sustainable, carbon-neutral, and competitive energy sector. Given the current global challenges and increasing concerns about energy security, understanding these technological solutions has a critical role to play. While energy storage technologies are widely recognised as critical enablers of energy security and fundamental elements for maintaining uninterrupted power supply through peak load balancing, policy makers often face a knowledge gap regarding the availability and optimal suitability of different energy storage technologies. Figure 5: TOPSIS sensitivity analysis for battery alternatives changing the weight of indicators as follows: (**a**)—system response time; (**b**)—efficiency of the storage system; (**c**)—environmental impact; (**d**)—technological readiness of the system for commercialization; (**e**)—social factor, direct benefit to society. technologies for specific national and local contexts. This knowledge gap arises from the multitude of factors that influence decision making in the energy sector. Considering the challenges of the modern world, electricity storage technologies are evolving very rapidly, and thought is constantly being given to how to improve their operational capacity, extend their life cycle, reduce the cost of technology, and make other improvements. Similarly, a large portion of the electricity storage alternatives studied have reached the technology development stage for broader integration into the power transmission infrastructure. The information found in the literature sources on the technical parameters of the storage technology also allowed conclusions to be drawn about the criteria and threshold values for their sizes. The values used in the analysis were determined based on the experience of energy experts. This research demonstrates a comprehensive and easily reproducible methodology that can be used by policy makers, energy planners, and local public authorities in making decisions about the selection of the most optimal and appropriate energy storage solution, taking into account multiple influencing factors. After conducting the relevant analyses, reviewing the literature sources, the most innovative solutions, weighing the influencing criteria and summarizing the results, it has been possible to achieve the goal of this research, to determine the potentially best renewable electricity storage alternatives and to provide a general overview of the current stage of technological development in this field. Using the TOPSIS MCDA method, it was found that lithium-ion batteries are the best alternative in the battery group, considering their efficiency, sustainability, and technological readiness, although the amount of investment is currently the largest for this type. In the accumulation systems group, the pumped-hydro storage was the closest to the ideal solution for the moment, however, weighing all the factors, it was concluded that the technologies with more potential were hydrogen and green ammonia. The sensitivity analysis applied for battery types gave insight into the main factor inhibiting the commercialization of technologies--the high cost of installation and individual components, and total necessary investments. In general, research has provided insight into the renewable electricity technology sector, evaluating the positive and negative factors of different accumulation systems, as well as future development opportunities, by weighing the best solutions. The methodology of this study is useful for various policy makers, ranging from local municipal development plans to national and international targets and their implementation mechanisms, and is the first step in selecting and ranking technologies based on a broader list of criteria.