“…In the past, significant levels of public and private R&D funding have taken place in the energy-intensive industries and led to a series of pilot projects (for example in Europe in the steel sector funded by the Horizon 2020 program, as well as the NER 300 fund ( Kushnir et al., 2020 )), bringing technologies (close) to large-scale maturity. In the long-run, sufficient carbon pricing (including carbon leakage protection) promises to provide a framework to ensure private investments in clean processes ( Bataille et al., 2018 ), potentially complemented or substituted by phasing-out policies at later stages of the diffusion process, such as product carbon requirements ( Gerres et al., 2021 ). However, currently private investments in these technologies face the challenges of (i) first-of-kind costs (ii) higher operation and investment costs than conventional carbon-intensive processes and (iii) insufficient and uncertain carbon prices, which partly stem from political uncertainty, and which, owing to incomplete risk markets ( Greenwald and Stiglitz, 1986 ), can usually not be hedged over sufficient time horizons ( Newbery et al., 2019 ).…”