Welcome to join in the 2025 6th International Conference on Clean and Green Energy Engineering, which will be held in Zagreb, Croatia during August 23-25, 2025 Paper Publishing： Submissions will be peer reviewed by the conference technical committees and internatioal reviewers. Accepted and presented papers at the conference will be published in the proceedings of CGEE 2025 and included into IEEE Xplore, which will be sent to EI Compendex, Scopus for indexing. A set of selected papers with extended version (at least 40% new content) will be sent to Journal of Energy – Energija for review and published as regular papers after the conference, which will be indexed by Inspec, Google Scholar and Scilit. CGEE 2024 Conference Proceedings will be available in IEEE Xplore, indexed by EI Compendex, and Scopus. CGEE 2023 Conference Proceedings available in IEEE Xplore, indexed by EI Compendex, and Scopus. CGEE 2022 Conference Proceedings available in IEEE Xplore, indexed by EI Compendex, and Scopus. Conference Venue: Zagreb, Croatia Call For Paper 1. Clean and Renewable Energy Technologies Clean Energy Systems and Technologies Solar Energy Engineering Biomass Energy Engineering Wind Energy Engineering Hydrogen and Fuel Cell Nuclear Energy Engineering2. Energy Storage and Saving Technologies 2. Energy Storage and Saving Technologies Energy Materials Storage Technology Energy-saving Technology Energy Chemical Engineering Energy-efficient Lighting Products and Technologies Gasification Green Energy Systems Green Power Production and Cogeneration CO2 Capture, Storage, and Utilization Exergetic and Exergoeconomic Analyses The method for submitting your paper: Electronic Submission system: https://confsys.iconf.org/submission/CGEE2025 Please feel free contact with us: Paulina Aydogan (Conference Secretary) E-mail: cgeeconf@163.com For more information about international conferences, please visit our conference website: CGEE 2025 Website: https://www.cgee.org/