The world is gripped with a sense of crisis over the disasters caused by rapid climate change. Various policy and technical attempts are being made to reduce carbon emissions around the world. Since the issue of RE100 was raised in the last presidential debate, interest in RE100 has been increasing. RE100 is a voluntary campaign to cover corporate power with 100% renewable electricity, and is attracting more attention in line with the company's sustainable management policy. In this review, the reality of RE100 and related policies were investigated. Based on this, the institutional direction for the realization of RE100 was presented.