OPTIMATION OF ENERGY USAGE IN ELECTRIC REACTORCOOGENERATION SYSTEM AND HYDROGEN PRODUCTION WITH.GT-MHR(GAS TURBINE MODULAR HELIUM REACTOR). Akhmad KhoiruI Anam, Andang Widi Harto, Kusnanto; UGM. Review on two aspects HTGR aselectric (cQnversiQn) or heat energy source and hydrogen production is developing.Electrolyze on hydrogen production process. is most established technology frum"wa,tersplitting", by using DC current to divide water into oxygen and hydrogen gas.For high efficiency on industry scale, this process called as "high temperatureelectrolysis of steam "utilizing high temperature. Study and· consideration fromproduction and economiaspect is required so that found optimation from HTGR inusing temperature about 850 - 950 0