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Cost-efficiency of the EU emissions trading system: An evaluation of the second trading period

: Cludius, Johanna; Duscha, Vicki; Friedrichsen, Nele; Schumacher, Katja


Economics of energy & environmental policy 8 (2019), Nr.1, 17 S.
ISSN: 2160-5882
ISSN: 2160-5890
Fraunhofer ISI ()
EU emission trading system (EU ETS); cost efficiency; ex-post analysis; alternative policy; counterfactual scenario

Cap and trade systems are considered to be one of the most cost-efficient options to achieve emission reduction targets. This paper extends the literature on the evaluation of emissions trading systems (ETS) by providing insights into the methodology of the ex-post evaluation of cost-efficiency. Based on data from the second trading period of the EU ETS, this paper compares different settings for ex-post cost-efficiency analyses. A highly disaggregated base scenario reveals average cost savings from trade of about 865 million Euro p.a., an efficiency gain of 47% compared to the alternative policy scenario without trade. Sensitivity scenarios indicate lower efficiency gains in cases with higher sectoral and regional aggregation emphasising the importance of intra-industry and inter-country trade. Furthermore, assumptions regarding the abatement requirements under the alternative policy play a key role, along with the choice of marginal abatement cost curves. In line with ex-ante results from the literature, the backward looking empirical results of this paper uniformly support the theoretical cost-efficiency of the EU ETS.