This working paper, published by the US-based Center for Global Development, outlines a market-oriented approach to funding the development and deployment of low-carbon energy technologies in developing countries. It describes how a green venture fund, with money coming from public and private investors, could help the development of green technologies suitable for use in low-income countries "in time to avoid catastrophic climate change". The authors discuss the commercialisation of these technologies; the structure and rationale of the funding strategy; and how the fund could operate, addressing key issues such as setting technology priorities, geographic focus, and the treatment of public and private investors.