Solving societal problems such as climate change requires commercializing new technologies. Yet, due to incomplete information, there are under-developed markets for finance and insurance for these new technologies. Temporary support to bring the first set of projects to market may be warranted to resolve this credit market failure. Sugandha investigates the impact of the UK’s feed-in tariff (FiT) which provides revenue certainty by offering a fixed price for power generated by solar farms over 25 years. Exploiting the presence of bunching at the policy’s eligibility threshold, Sugandha finds the FiT supported the first tranche of commercial solar investments in the country, contributing to at least 2.3 GW of additional capacity from 2010-2015 (equal to one-fifth of all solar in the UK today). Tradable certificates for clean energy that provided similar subsidies at the point of entry, but without the long-term guarantee over price, were not able to induce the same degree of market-creation, illustrating the value of risk reduction. A social cost of carbon equal to £100/tCO2 makes the FiT a net benefit.