Solar thermal power plants use the sun?s rays to heat a fluid, from which heat transfer systems may be used to produce steam. The steam, in turn, is converted into mechanical energy in a turbine and into electricity from a conventional generator coupled to the turbine. Solar thermal power generation is essentially the same as conventional technologies except that in conventional technologies the energy source is from the stored energy in fossil fuels released by combustion. Solar - thermal technologies use concentrator systems due to the high temperatures needed for the working fluid. The three types of solar-thermal power systems in use or under development are: parabolic trough, solar dish, and solar power tower. Presently, only hydro and wind power plant at good sites can generate electricity in an acceptable cost range .The potentials of hydro and wind power on the other hand are limited. However solar electricity generation is a nearly unlimited source. Photovoltaic is one promising technology .The sun has produced energy for billions of years. Solar energy is the solar radiation that reaches the earth. Solar energy can be converted directly or indirectly into other forms of energy such as heat and electricity. Electricity can be produce directly from solar energy using photovoltaic devices or indirectly from steam generators using solar thermal collectors to heat a working fluid. Photo voltaic energy is the conversion of sunlight into electricity through a photovoltaic cell commonly called a solar cell. A photovoltaic cell is non mechanical device usually made from silicon alloys. Renewable power plants are needed if a high amount of hydrogen shall be produce for the use in climate-compatible energy market. This solar electricity generation will take over an important part in the near future solar powered desalination offers now opportunities for hydrogen production. Hydrogen produced with electricity from solar thermal plants will be one major option for clean fuel alternatives and electricity supply when storage possibilities are needed. solar thermal power generation technology consists of three types thermal power system. The three systems are parabolic through system power tower system and dish engine system. Together they are key technologies for a sustainable energy industry with a main focus on climate protection.