Various types of the energy storage system (ESS) have been developing to compensate for the renewable power generation. The objective of the study is to develop the novel renewable hybrid system composed of the reversible solid oxide fuel cell (SOFC)/solid oxide electrolyser cell (SOEC) system and waste steam. In case of SOEC operation mode, the surplus electricity and the steam of 3 bar and 750 ℃ are supplied to the SOEC system to generate the hydrogen. The steam is generated by the boiler using the solid refuse fuel (SRF). The generated hydrogen is de-humidified by flowing through the heat exchanger and dryer, then heated and compressed to be stored at the metal hydride. In case of the SOFC operation mode, the hydrogen from the metal hydride enters to the SOFC system to generate the power. In order to improve the system efficiency, the off gas from the hydrogen electrode of the SOFC/SOEC system is recirculated by regenerative blower or ejector. And the system exhaust heat could be used for the hydrogen storage/release. The system analysis has been conducted to determine the system efficiency by Aspen Plus®. In order to achieve the system optimization, the efficiency of the various system configurations have been compared.