Renewable energy technologies often face high upfront costs, making financing conditions highly relevant. Thus far, the dynamics of financing conditions are poorly understood. Here, we provide empirical data covering 133 representative utility-scale photovoltaic (PV) and onshore wind projects in Germany over the last 18 years. These data reveal that financing conditions have strongly improved. As drivers, we identify macroeconomic conditions (general interest rate) and experience effects within the renewable energy finance industry. For the latter, we estimate experience rates. These two effects contribute 5% (PV) and 24% (wind) to the observed reductions in levelised costs of electricity (LCOEs). Our results imply that extant studies may overestimate technological learning and that increases in the general interest rate may increase renewable energies' LCOEs, casting doubt on the efficacy of plans to phase out policy support.

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Given the magnitude of investment needs into low-carbon power generation, the availability and cost of capital is crucial for successful energy transitions. Recently, a strong increase of non-recourse project finance (as compared to corporate finance on a project sponsor's balance sheets) could be observed for power generation projects. Classical economic motivations for project finance are the prevention of contamination risk, and agency conflicts -however, these reasons do not apply for comparably small projects in low-risk environments, such as many renewable energy projects being realized today. This paper therefore assesses the importance of project finance for renewable energy projects in investment-grade countries, and the underlying drivers to use this kind of finance. Eight potential reasons for using project finance are distilled from economic and finance theory, and then empirically evaluated using a novel dataset for new power plant investments in Germany 2010-2015. Results show that in this extreme case with particularly low investment risks, project finance has much larger importance for renewables than for fossil fuel-based power plants. It is not used to reduce contamination risk or agency conflicts, but, instead driven by the "debt overhang" of non-utility sponsors such as independent project developers. We discuss implications for policy makers, the financial sector, as well as energy scholars concerned with power generation investment decisions.