## 3 Bibliometric Analysis
### Evolution of Publications and Research Areas
Finally, Cluster 4, centered on \"Biomass\", indicates that biomass remains a niche topic but holds critical applications in specific contexts, such as water supply, which is also reflected in the figure. Table 3 and Figure 5 provide a comprehensive view that renewable energies dominate current research, particularly solar and wind. Meanwhile, areas such as biomass and energy efficiency offer opportunities for future studies to enhance energy resilience and mitigate the effects of climate change and drought. Analyzing keyword clusters reveals key connections between renewable energy and climate change research. The dominant cluster, centered on \"solar power generation\", \"solar energy\", and \"climate change\", underscores solar energy's central role in mitigating climate change. This cluster links to land use, investments, and economic analysis, reflecting broad interest in this technology. Similarly, the \"renewable energies\" and \"wind power\" clusters highlight the significance of wind energy and the diversification of energy sources. Another cluster, focused on optimization and energy resources, includes terms like \"optimization\" and \"renewable energy resources\", emphasizing the need to enhance renewable technology efficiency and reduce fossil fuel dependence. A separate cluster includes \"biomass\", \"water supply\", and \"energy efficiency\", signaling emerging interest in alternative energy solutions, particularly in regions with water scarcity [60; 66; 67; 68]. While solar energy and climate change dominate research, there are opportunities to explore resource optimization and energy efficiency further, guiding future studies. Notably, \"drought\" appears in the renewable energy and wind power cluster, suggesting that wind energy research is linked to studies on drought mitigation. However, \"megadrought\" is absent from the figure, indicating a gap in explicit research. This reinforces the importance of investigating how renewable sources like solar and wind power can address prolonged droughts, especially in countries like Chile, where megadroughts pose significant challenges. The bibliometric analysis identified 1116 keywords, with Table 4 presenting the 20 most frequently used terms. The most common were \"Renewable energy\" (26 occurrences), \"Solar energy\" (24), \"Renewable energies\" (21), \"Climate change\" (19), and \"Wind power\" (17), confirming the field's strong focus on clean energy. The presence of \"Drought\" (15 occurrences), \"Water scarcity\" (9), and \"Optimization\" (12) aligns with keyword clusters, reinforcing solar energy's central role in climate change mitigation. \"Climate change\" and \"Wind power\" also appear prominently, emphasizing wind energy's growing relevance in sustainable energy research. The frequent occurrence of \"Drought\" highlights the need for energy sources independent of water, such as solar and wind power, particularly in regions affected by megadroughts. Furthermore, \"Optimization\" and \"Energy efficiency\" emphasize the ongoing effort to improve renewable energy efficiency, supporting the transition toward sustainable and resilient energy solutions.