Storing the surplus energy from renewable energy resource is one of the challenges related to intermittent and fluctuating nature of renewable energy electricity production. CO2 methanation is well known reaction that as a renewable energy storage system. CO2 methanation requires a catalyst to be active at relatively low temperatures (250-500 °C) and selectivity towards methane. In this study, the catalytic performance test was conducted using a pressurized bubbling fluidized bed reactor (Diameter: 0.025 m and Height: 0.35 m) with Ni/γ-Al2O3 (Ni70%, and γ-Al2O330%) catalyst. The range of the reaction conditions were H2/CO2 mole ratio range of 4.0-6.0, temperature of 300-420 °C, pressure of 1-9 bar, and gas velocity (U0/Umf) of 1-5. As the H2/CO2 mole ratio, temperature and pressure increased, CO2 conversion increases at the experimental temperature range. However, CO2 conversion decreases with increasing gas velocity due to poor mixing characteristics in the fluidized bed. The maximum CO2 conversion of 99.6% was obtained with the operating condition as follows; H2/CO2 ratio of 5, temperature of 400 °C, pressure of 9 bar, and U0/Umf of 1.4-3.