Initially a satellite of $100 \text{ kg}$ is in a circular orbit of radius $1.5R_E$. This satellite can be moved to a circular orbit of radius $3R_E$ by supplying $\alpha \times 10^8 \text{ J}$ of energy. The value of $\alpha$ is ___________. (Take Radius of Earth $R_E = 6 \times 10^6$ m and $g = 10$ m/s²)