A method of producing heat for industrial purposes such as power generation can use at least one, if not two exothermic reactions. First, methane may be produced from carbon dioxide and hydrogen in a reactor. This reaction produces heat. The methane may be burned, or oxidized (which is also an exothermic reaction) to produce carbon dioxide and hydrogen. Oxygen and/or hydrogen may supplement the process as could be produced from the electrolysis of water. Carbon dioxide may be obtained from a variety of sources.