Cyanobacteria, with their metabolic versatility, hold promise for sustainable energy solutions like biohydrogen production. The research showcases a 30-fold increase in H2 production rate by heterocystous cyanobacterium, with the process extended to 46 days, yielding up to 67% H2. These findings highlight the potential of cyanobacteria in biohydrogen production, leveraging abundant natural resources and aligning with global carbon reduction goals. By exploring genetic and metabolic strategies, researchers aim to enhance the yield, efficiency, and scalability of cyanobacterial biohydrogen production. Furthermore, the integration of cyanobacterial biohydrogen production with carbon capture technologies presents a cost-effective solution for reducing fossil fuel reliance and advancing renewable energy goals. Optimizing cyanobacterial metabolic pathways not only contributes to renewable energy portfolios but also plays a crucial role in addressing climate challenges. The study underscores the importance of cleaner and sustainable energy sources, positioning hydrogen derived from biological sources as a key player in the transition to a greener energy landscape.