Yellow hydrogen, also known as photochemical hydrogen, is a promising source of energy that utilizes sunlight and water to produce hydrogen through a photocatalytic process. Unlike traditional methods that rely on fossil fuels, yellow hydrogen has minimal greenhouse gas emissions, making it an environmentally friendly solution for energy generation. The production process involves splitting water molecules into hydrogen and oxygen using sunlight and a photocatalyst, with hydrogen being collected for fuel and oxygen released into the air. While yellow hydrogen presents opportunities for local energy production and increased energy security, challenges such as higher costs and the need for improved efficiency persist. Research institutions in the United States, including the National Renewable Energy Laboratory and universities like the University of Colorado Boulder and the University of California, Berkeley, are working on enhancing the technology to make yellow hydrogen production more cost-effective. The future of yellow hydrogen as a medium-term replacement for fossil fuels is promising, especially in solar-rich states like California and Texas, where the integration of yellow hydrogen with other clean energy sources can lead to a diversified and efficient energy mix.