Increasing atmospheric pollution and problems with the use of nuclear fission have necessitated the development of alternative energy production systems that will minimize the use of fossil fuels and nuclear fission. Solar energy, wind and geothermal energy are examples of renewable energy sources that could be utilized to replace fossil fuels. Unfortunately, these alternatives are subject to changes with respect to location and  have a low energy density. On the other hand, these low density sources can be utilized conveniently if they are first converted into a common energy carrier such as hydrogen. As the METU biohydrogen group, we have been developing processes for production, storage and utilization of hydrogen, in projects supported by METU and TUBITAK.