Hydrogen is gaining increasing attention as an encouraging future energy. Hydrogen as secondary energy carrier is produced from natural gas, biomass, and water by electrolysis, thermolysis, and biological process photolitically. Hydrogen has the potential to be a clean alternative to the fossil fuels currently used in the transportation sector. This is especially true if the hydrogen is manufactured from renewable resources. Hydrogen has the potential to solve two major energy problems: reducing dependence on petroleum and reducing pollution and greenhouse gas emissions. Biomass can be thermally processed through gasification or pyrolysis to produce hydrogen. Future energy technology will utilize hydrogen with an increasing trend in steady as well as unsteady combustion processes. Hydrogen could be advantageously used as a clean energy carrier for heat supply and transportation purposes.