Towards Integrated Water–Energy Systems in Mountain Environments: Insights from a Systematic Literature Review

Mountain regions are increasingly affected by the interplay of climate change, infrastructure stress, and evolving socio-ecological systems, intensifying pressure on both water and energy systems. This systematic review investigates how recent scientific literature addresses the management and integration of water and energy systems in mountainous contexts. Following PRISMA guidelines, 88 peer-reviewed studies from 2022 to 2025 were selected through structured database queries and thematic screening. Two key imbalances emerge. First, a geographical imbalance is evident: while the majority of studies come from Asia, Europe shows a strong record of applied efforts, the Americas are moderately represented, and research from Africa remains scarce. Second, a thematic imbalance: water management research is conceptually and methodologically mature, while energy-focused studies remain limited in number and scope. Efforts toward integrated water–energy management are emerging but are mostly confined to pilot projects or modelling exercises, often lacking systemic framing and institutional support. From these findings, three priority directions are identified: advancing adaptive co-design approaches that link water supply, energy storage, ecological flows, and human demand; harmonizing methods, metrics and cross-regional benchmarks to enhance comparability and transferability; strengthening social and institutional pathways to foster resilient, adaptive water–energy systems in mountain environments.