# Innovative Strategies for Combining Solar and Wind Energy with Green Hydrogen Systems
###### Abstract
Cost analyses indicate that the levelized cost of hydrogen (LCOH) derived from wind energy for PEMWE fluctuates between USD 5.3 and USD 9.29 per kilogram; in contrast, AWE ranges from USD 7.49 to USD 7.59 per kilogram. Moreover, solid oxide electrolyzers (SOEs) exhibit costs varying from USD 6 to USD 9.34 per kilogram, with the possibility of a significant reduction to USD 1.9 per kilogram by 2050. This analysis underscores that wind speed significantly influences the production costs of GH. However, the interaction of various factors complicates the overall scenario, because it creates a multifaceted landscape that requires careful consideration. [PERSON] et al. [13] explored the synergy between solar photovoltaic (PV) and wind systems in order to provide energy for a green building located at Rajasthan Technical University in Kota, India. By employing the iHOGA algorithm, the researchers optimized a hybrid system that yields 6988 kWh/year of energy, which effectively meets the building's demand of 6759 kWh (with minimal surplus). The system, however, reduces energy loss to 276 kWh/year and mitigates an impressive 5273.14 kg of CO2 emissions annually. Furthermore, the integration of these renewable sources significantly decreases other pollutants--most notably, 9601.512 kg of SO2 and 32,424.32 kg of NOx each year--thus underscoring the environmental advantages of this approach. Although the results are promising, the study invites further investigation into optimizing such systems, because the potential for greater efficiency and sustainability remains. [PERSON] et al. [14] introduced a system based on solar and wind energy for the production of liquid hydrogen and ammonia--two sustainable energy carriers--addressing urban demands for electricity, cooling, heating, and freshwater. The research evaluates three scenarios: the exclusive production of liquid hydrogen, ammonia and a dual production approach. An artificial neural network facilitates predictions, while a genetic algorithm optimizes the entire system. When utilizing 40% of net power in the electrolyzer, the system achieves energy and exergy performances of 56.78% and 44.69%, respectively, producing 13.2 MW of net power. This is coupled with substantial outputs of liquid hydrogen, ammonia, freshwater, and cooling load. Exergy analysis reveals high destruction rates in the Rankine cycle and electrolyzer. However, the optimal production rates and efficiencies are identified for the dual production scenario, which highlights the complexity of the system. Although the findings are promising, further research is necessary to enhance performance and sustainability. This review paper shows a thorough evaluation of the novel approaches used to combine wind and solar energy with green H2 systems. The article classifies and examines existing techniques, emphasizing their technological and economic benefits, as well as the problems they face. It also looks at the most recent technological advances that are being researched to address these difficulties and improve the efficiency of integrated renewable energy systems. This review is unique in that it takes a comprehensive approach to the integration of wind and solar energy with green H\({}_{2}\) systems, providing a full examination of both established and new techniques. Unlike prior evaluations, which frequently focus on either wind or solar energy integration with H\({}_{2}\) generation in isolation, this research conducts an unbiased study of various hybrid configurations and possible synergies. Additionally, the paper presents a novel paradigm for evaluating the sustainability and effectiveness of these integrated systems, taking into consideration the most recent advances in materials science, design of systems, and energy management systems. By presenting a roadmap for future research and development, this review intends to bridge the gap between theoretical study and practical application, eventually contributing to the growth of sustainable energy systems.