Hydropower emerges as hub for multi-technology renewable hybrid systems

⚡ AI Executive Summary

A comprehensive review examines how hydropower's inherent flexibility and controllability can serve as a central platform for integrating variable renewables alongside floating solar, battery storage, and green hydrogen production. The research synthesizes existing literature on hybrid configurations, identifying both the complementary roles these technologies play and significant gaps in how they are modeled and optimized together. The analysis reveals critical insights for system designers: the choice of modeling tools can systematically bias conclusions about battery integration economics, and hydrogen investment recommendations diverge sharply depending on whether analysis occurs at the plant or grid level. These findings suggest that while hydropower-anchored hybrids offer genuine promise for high-renewable grids, no single configuration serves all conditions—the optimal mix depends on boundary conditions, local resources, and operational constraints. The research identifies five structural barriers preventing fully integrated four-technology systems and calls for standardized techno-economic reporting, multi-timescale optimization frameworks, and real-world operational validation to unlock this potential.