Guest Editors
Dr. Panagiotis Grammelis
Email: grammelis@certh.gr
Affiliation: Centre for Research & Technology Hellas, Chemical Process and Energy Resources Institute, 6th km. Charilaou-Thermis, Thermi, GR 57001, Greece
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Research Interests: Energy production, storage and conversion technologies; low carbon energy systems; alternative fuels and hybrid energy solutions; advanced energy systems; renewable energy hybrid storage integration; environmental sustainability

Summary
The world is facing a continuous development of the global energy landscape thus there is an evident ever-increasing demand for efficient, reliable, and sustainable energy storage solutions. In order to achieve the aforementioned, Hybrid Energy Storage Systems (HESS) pose as a promising approach that can assist to overcome the obstacles and limitations of individual thermal and electric energy storage technologies by integrating a vast field of technological advancements including batteries, supercapacitors, TES- thermal energy storage, hydrogen storage, and mechanical storage systems. By coupling the complementary characteristics of these various energy storage solutions, HESS can play a decisive role in: a) enhancing and improving energy density as well as the power capabilities of the systems, b) extending the lifecycle efficiency/potential/expectancy of these systems and c) optimizing the adaptability for a range of various applications such as renewable energy integration, grid stability, e-mobility, industrial processes and energy management as a whole. This proposed Special Issue of the Journal of Energy Engineering seeks to highlight recent advancements, challenges, and emerging trends in HESS by exploring innovative materials and processes, new system architectures, AI-driven implementation as well as control mechanisms, optimization strategies, and practical applications of various multi-energy systems, expanding from micro-grids to large-scale energy networks. Thus, this Special Issue aims to bring together interdisciplinary fields of research in order to provide a comprehensive understanding of HESS as well as cutting edge technology advancements of these systems and to highlight their role in driving a more resilient, efficient, and sustainable global energy transition.
The special issue welcomes original research articles, review papers, and case studies on topics including but not limited to:
· Thermal and Electrochemical Energy Storage Integration
· Hybrid energy storage system configurations
· Materials and component innovations
· Optimization and control strategies and AI applications
· Applications in Renewable Energy and Smart Grids
· Hybrid Storage for Sustainable Mobility
· Thermal management in hybrid storage
· Techno-economic and environmental assessments - LCA
· Applications in smart grids and industry
Graphic Abstract
Keywords
Hybrid Energy Storage Systems (HESS), Battery-Supercapacitor Hybrid Storage, PCM, Electrochemical - Thermal Energy Storage, Smart Grids, AI Management & Applications, RES Integration, Hydrogen Technologies, LCA