Design of an eco-friendly hybrid energy supply system for none-electrified Lake Ziway island in Ethiopia

Tedecha Island, Ethiopia, faces unique energy challenges due to its isolation and reliance on traditional energy sources. This research proposes a sustainable hybrid power system for the island’s 2,500 residents, integrating solar, wind, and pumped hydro storage (PHS). Wind data, collected over a year, informed the system design. The PHS utilizes Lake Ziway and a nearby crater pond, with a GIS-LiDAR based 3D model guiding its development. Solar energy potential was assessed using PVGIS 5.2 and local data. Homer Pro optimized hybrid configurations, including a 245 kWh PHS component, resulting in a cost-effective wind-solar-PHS microgrid with a COE of $0.130-$0.162/kWh. Crucially, the system design aligns with the Water-Food-Energy Nexus (W-F-E-N) approach. Analysis of upper reservoir water levels (0-100%) demonstrated robust operation within a 0-75% range, maintaining energy supply. This study showcases the viability of an environmentally friendly hybrid system for Tedecha Island, leveraging existing natural reservoirs to minimize costs and environmental impact, providing a valuable model for similar off-grid communities.