RT journal article T1 Collective hydrogen stand-alone renewable energy systems for buildings in Spain. Towards the self-sufficiency A1 Gil Mena, Antonio José A1 Abderraouf, Bouakkaz A1 Abelleira Pereira, José María A1 Segovia Guerrero, Luis A1 Martín Rodríguez, María de la Luz A2 Ingeniería Eléctrica A2 Ingeniería Industrial e Ingeniería Civil A2 Ingeniería Química y Tecnología de Alimentos K1 Hydrogen-PV systems K1 Residential sector K1 Net-zero energy buildings K1 Techno-economic analysis K1 Levelized cost of energy AB The article examines the feasibility of implementing standalone hydrogen-based renewable energy systems in Spanish residential buildings, specifically analyzing the optimization of a solar-battery and solar-hydrogen system for a building with 20 dwellings in Spain. The study initially assesses two standalone setups: solar-battery and solar-hydrogen. Subsequently, it explores scenarios where these systems are connected to the grid to only generate and sell surplus energy. A scenario involving grid connection for self-consumption without storage serves as a benchmark for comparison. All system optimizations are designed to meet energy demands without interruptions while minimizing costs, as determined by a techno-economic analysis. The systems are sized using custom software that incorporates an energy management system and employs the Jaya algorithm for optimization. The findings indicate that selling surplus energy can be economically competitive and enhance the efficiency of grid-connected self-consumption systems, representing the study's main innovation. The conclusion highlights the economic and technical potential of an autonomous hybrid energy system that includes hydrogen, with the significant remaining challenge being the development of a regulatory framework to support its technical feasibility in Spain. PB Elsevier SN 0360-3199 YR 2024 FD 2024-06-27 LK http://hdl.handle.net/10498/32581 UL http://hdl.handle.net/10498/32581 LA eng DS Repositorio Institucional de la Universidad de Cádiz RD 21-sep-2026