 Supercritical water gasification is an alternative method of converting wet biomass into a product gas that can be used as substitute natural gas. It uses water in its supercritical state, which has drastically different physical properties than when it is in its liquid form. Research on this technology dates back to the 1970s, and it has been studied extensively ever since. The process involves heating wet biomass in a pressurized vessel with steam until it reaches its supercritical state, where it undergoes chemical reactions that convert the biomass into a product gas. The process is still being developed and refined, but it holds great potential for renewable energy production. This article was authored by O'Nursell Yacoboylu, John Herring, K. G. Smit, and others.