Energy poverty remains a pressing challenge in low-income regions, particularly in sub-Saharan Africa, South Asia, and Latin America, where over 733 million people lack access to electricity. Centralized grid expansion has failed to bridge this gap due to high infrastructure costs, technical inefficiencies, and vulnerability to climate-induced disruptions. Decentralized renewable energy (DRE) systems, including solar mini-grids, wind microgrids, biomass energy, and micro-hydro solutions, present a cost-effective, climate-resilient, and scalable alternative that leverages locally available resources. However, DRE adoption is hindered by financial constraints, weak regulatory frameworks, and fragmented policy implementation. This study employs a scoping review and comparative case study approach to assess the effectiveness of DRE solutions in expanding energy access, enhancing climate resilience, and fostering economic development in low-income regions. Case studies from Kenya’s solar-wind hybrid mini-grids, Rwanda’s pay-as-you-go (PAYG) solar expansion, Ethiopia’s biomass and biogas systems, Nigeria’s off-grid solar initiatives, and South Africa’s community-led wind energy projects reveal that DRE systems significantly reduce reliance on fossil fuels, improve local economic stability, and mitigate the impact of climate variability. However, key gaps persist in long-term resilience assessments, cross-sector policy harmonization, and the comparative viability of different DRE technologies. The study underscores the need for integrated policy frameworks, innovative financing mechanisms such as green bonds and PAYG solar, and governance models that facilitate equitable energy transitions. Scaling DRE is critical for achieving sustainable development, climate adaptation, and energy equity in low-income regions.
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