In particular, as the proportion of power generation from variable renewable energy sources increases, maintaining the stability of the power grid becomes a more important task. Demand for minerals essential for clean energy related technologies is expected to increase, however, production of these minerals is concentrated in specific countries. Major concerns related to carbon neutrality or clean energy investment include whether sufficient investment is being made, whether funds are being directed to countries or sectors in urgent need of financial support, and how to induce private investment through public funds. Accordingly, our study analyzed energy security from the perspective of energy transition, and derived key issues and notable cases of international cooperation to ensure energy security and carbon neutrality. Based on our findings, we suggested policy implications for Korea.