To produce clean energy at low cost without burning fossil fuel and without discharging a carbon dioxide.

A clean energy producing system for a global environment conservation utilizes exhaust gas produced by a reduction reaction of iron oxide by aluminum, reaction heat for a power generation system for producing the clean energy. An MHD power generation, steam turbine power generation utilizing exhaust gas, combustion heat generated in the case of dust incineration by hydrogen jet flame using a reduction reaction of a magnesium are performed. Further, a power generation by a temperature difference using the remaining heat, a fuel cell by hydrogen production using steam as a material are developed.