OPTIMAL ENVIRONMENTAL POLICY DESIGN IN THE PRESENCE OF UNCERTAINTY AND TECHNOLOGY SPILLOVERS

Patrick Himmes () and Christoph Weber

No 1102, EWL Working Papers from University of Duisburg-Essen, Chair for Management Science and Energy Economics

Abstract: The stylized model presented in this paper extends the approach developed by Fischer and Newell (2008) by analysing the optimal policy design in a context with more than one externality while taking explicitly into account uncertainty surrounding future emission damage costs. In the presence of massive uncertainties and technology spillovers, well-designed sup-port mechanisms for renewables are found to play a major role, notably as a means for compensating for technology spillovers, yet also for reducing the investors’ risks. How-ever, the design of these support mechanisms needs to be target-aimed and well-focused. Besides uncertainty on the state of the world concerning actual marginal emission damage, we consider the technological progress through R&D as well as learning-by-doing. A portfolio of three policy instruments is then needed to cope with the existing externalities and optimal instrument choice is shown to be dependent on risk aversion of society as a whole as well as of entrepreneurs. To illustrate the role of uncertainty for the practical choice of policy instruments, an em-pirical application is considered. The application is calibrated to recent global data from IEA and thus allows identifying the main drivers for the optimal policy mix. In addition to assumptions on technology costs and uncertainty of emission damage cost, the impor-tance of technology spillover clearly plays a key role. Yet under some plausible parame-ter settings, direct subsidies to production are found to be of lower importance than very substantial R&D supports.

Keywords: Externality; technology; learning; uncertainty; climate change; spillover; renewable energy; policy (search for similar items in EconPapers)
JEL-codes: O38 Q21 Q28 Q48 (search for similar items in EconPapers)
Pages: 21 pages
Date: 2011-03, Revised 2011-03
New Economics Papers: this item is included in nep-agr, nep-ene, nep-env, nep-reg and nep-res
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:dui:wpaper:1102

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