A novel technology model is presented that simplifies the technical requirements to produce hydrogen and clean energy from water splitting high temperature electrolysis process. Thus the model developed was applied to progress research in water based /hydrogen Internal Combustion Engines (ICE) with potentials of meeting the carbon footprints targets. Thus, the hydrogen (H2) from water splitting high temperature electrolysis process when reacted with CO2 produces methane (CH4) in their thermodynamic ratio to combust internal combustion engines and power plants. The thermodynamic simulation data derived from Aspen Plus software environment was used to simulate volume–temperature expansion at high pressure which has been applied to further water based/hydrogen internal combustion engine at different thermodynamic temperature requirements of 25°C, 100°C, 400°C, 800°C and 2000°C. A seamless and safe transition from fossil based economy to hydrogen economy is now feasible with new insights in thermodynamics theory where water as a raw material that could power the next hydrogen internal combustion engines and hydrogen power plants for future energy industry offer a cheaper and more sustainable fuel.