Developing economies face a growing climate finance challenge: climate needs are expanding faster than public budgets, while many climate projects remain insufficiently visible, bankable, measurable, and structured for investment. This technical note examines how Public-Private Partnership models can support the conversion of climate ambition into bankable investment pipelines. Drawing on examples from South Africa, Morocco, Egypt, India, Kenya, Colombia, and Brazil, it demonstrates how BOO, BOOT, BOT, IPP/PPA, DBFOM, concession, availability-based, and energy performance models can be applied to different climate assets. The paper argues that developing economies, particularly in Africa, must move from climate vulnerability narratives to climate investment readiness through project preparation, PPP structuring, MEAL systems, and institutional capacity.