In the quest to meet the most basic needs of human survival, water and energy stand at the forefront—especially in remote island communities where infrastructure is scarce and logistics are costly. A recent study from Telkom University in Indonesia, led by engineering physicist Tri Ayodha Ajiwiguna, proposes a groundbreaking solution: a dual water–energy supply (DWES) system that integrates reverse osmosis desalination with photovoltaic solar power. This integrated approach not only addresses the dual scarcity of clean water and electricity but does so in a way that is both technically robust and economically viable.
The DWES system, as outlined in the paper published in *Desalination and Water Treatment*, combines two core components: a battery-less photovoltaic reverse osmosis (PV-RO) water supply system and an off-grid PV-based electric energy supply system (EESS) with battery storage. The innovation lies in the synergy between these systems. Excess electricity generated by the RO unit during peak solar hours is not wasted—it is redirected to power the EESS, thereby fulfilling local energy demand without additional infrastructure.
Ajiwiguna highlights the system’s efficiency: “The EESS in the DWES system requires only 9.3% more photovoltaic capacity than a standalone electricity system, yet it successfully meets both water and energy needs.” This modest increase in PV capacity belies the system’s transformative potential. For remote islands, where diesel generators and imported freshwater are the norm, this integrated model could slash operational costs and reduce environmental impact.
The study’s techno-economic analysis reveals compelling figures. The cost of water produced by the DWES system is approximately $1.74 per cubic meter, while electricity costs $0.67 per kilowatt-hour. These costs are competitive with traditional systems, particularly when considering long-term sustainability. More impressively, the system achieves a minimum payback period of 6.1 to 10.0 years—even without government subsidies—suggesting strong commercial viability.
For energy sector professionals, this research signals a shift toward modular, scalable, and sustainable infrastructure solutions. The integration of water and energy systems not only optimizes resource use but also enhances resilience in off-grid environments. As climate change intensifies pressure on freshwater supplies and energy grids, innovations like DWES could redefine how we approach decentralized resource management.
The findings, published in a respected journal, underscore a practical pathway forward. It’s not just about generating power or purifying water in isolation—it’s about creating a unified system that delivers both, efficiently and affordably. For island nations and remote communities, this could mean the difference between scarcity and self-sufficiency.