Integration of Fluid Renewable Energy and Integrated Energy Systems: From Traditional Hydropower to Emerging Ocean Energy Technologies

Dear Colleagues,

The global transition toward carbon neutrality necessitates rapid advancements in renewable energy integration. Fluid renewable energy—encompassing hydropower (including pumped hydro storage) and marine energy (tidal, wave, thermal gradient)—represents a critical pillar for achieving grid stability, flexibility, and sustainability in comprehensive energy networks. As variable renewables like wind and solar scale up, the role of dispatchable, storable fluid energy sources become paramount for balancing supply–demand gaps, enhancing grid resilience, and enabling high-penetration renewable systems. We are pleased to invite you to contribute to this Special Issue, which seeks to explore cutting-edge innovations and systemic solutions in this dynamically evolving field.

This Special Issue aims to compile high-impact research on technological breakthroughs, grid integration challenges, and socio-economic strategies for fluid renewable energy within modern multi-energy networks. By bridging traditional hydropower expertise with emerging marine technologies, we will address scalability, environmental synergy, and digitalization pathways for sustainable energy transitions. The scope aligns with the journal’s focus on renewable energy systems, grid stability, storage solutions, and cross-sectoral energy policy. We welcome submissions that advance theory, modeling, real-world applications, and policy frameworks to foster resilient, low-carbon energy infrastructures.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following:

• Hydropower and PSH Innovations: Couple field analysis, stable operation and control, efficiency upgrades, ecological retrofitting, small-scale systems, and hybrid pumped storage designs.
• Marine Energy Harvesting: Tidal/wave converter optimization, ocean thermal energy conversion (OTEC), and durability in harsh environments.
• Grid Integration and Flexibility: Role in ancillary services, multi-energy complementarity, and stability control with variable renewables.
• Digitalization and AI: Predictive maintenance, smart grid interoperability, and digital twin applications.

Dr. Chen Feng
Prof. Dr. Yuquan Zhang
Dr. Changliang Ye
Dr. Chengyi Li
Guest Editors

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