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Abstract: The paper aims to contribute to the longstanding technology-push vs. demand-pull debate and to the literature on renewable energy diffusion and renewable energy policy assessment. The authors argue that in addition to the traditional push-pull dichotomy, the drivers of technological change must be differentiated by whether they are exogenous or endogenous to the economic system. They maintain that a specific type of endogenous demand-pull mechanism (i.e. economic growth) is a major catalyst of environmental innovation. We apply this perspective to study the diffusion of renewable energy (RE) technologies in 15 European Union countries from 1990 to 2012. Applying different panel data estimators, the authors find that public R&D investments, policies supporting RE and per capita income all have a positive impact on RE diffusion, whereas the variability of policy support has a negative impact. However, they also find that economic growth is a stronger driver than either public R&D investments or policies supporting RE, and that models that do not take it explicitly into account tend to overestimate the importance of exogenous drivers. Most importantly, they note that the effect of economic growth on RE diffusion exhibits a nonlinear, U-shaped pattern that resonates with the well-known Environmental Kuznets Curve hypothesis. RE penetration remains negligible at low levels of growth whereas it increases sharply only after income per capita has reached a given threshold and the demand for environmental quality rises. Their findings have implications for policy making. They suggest that for RE diffusion to increase, government action should be directed not only at shielding renewables from competition with fossil fuel technologies but also at stimulating aggregated demand and economic growth.

Keywords: Deployment policy; Technological innovation; Renewable Energy; Environmental Kuznets Curve; Nonstationary Panel

JEL-codes: C23; O31; O33; O38; O44

33 pages, December 1, 2014

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