This case study analyzes Mizuho Bank's green project financing of a natural gas development project in Indonesia. Mizuho adopted the Equator Principles to fully assess the social and environmental risks. It required the borrower to mitigate risks and committed to environmental protection in the financing contract. More broadly, Mizuho promotes green credit, innovates green financing products, and supports carbon trading to improve the environment. It provides lower interest financing to green projects and assesses customer environmental performance to encourage sustainability.