This study examines the role of legal mechanisms in scaling climate finance by leveraging public funding to incentivize private investment, which is essential to bridge the climate finance gap in line with Nationally Determined Contributions (NDCs) under the Paris Agreement. The paper analyzes existing legal frameworks and proposes methods to de-risk private investments through public finance, with a focus on enhanced roles of multilateral and public financial institutions, reforms in international investment law, and minilateral initiatives, such as Climate Clubs.