Mission accomplished? A post-assessment of EU ETS impact on power sector emissions reduction

Ethan Eslahi, Anna Creti and María-Eugenia Sanin ()
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Ethan Eslahi: LEM - Lille économie management - UMR 9221 - UA - Université d'Artois - UCL - Université catholique de Lille - ULCO - Université du Littoral Côte d'Opale - Université de Lille - CNRS - Centre National de la Recherche Scientifique
Anna Creti: Université Paris Dauphine-PSL - PSL - Université Paris Sciences et Lettres
María-Eugenia Sanin: ERUDITE - Equipe de Recherche sur l’Utilisation des Données Individuelles en lien avec la Théorie Economique - UPEC UP12 - Université Paris-Est Créteil Val-de-Marne - Paris 12 - Université Gustave Eiffel, CEPS - Centre d'Economie de l'ENS Paris-Saclay - Université Paris-Saclay - ENS Paris Saclay - Ecole Normale Supérieure Paris-Saclay

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Abstract: The debate on the capacity of the European Union Emissions Trading System (EU ETS) to effectively induce CO emissions reduction is still ongoing. This is particularly noteworthy in the case of the power sector, where numerous decarbonization policies overlap. This paper contributes to this discussion by leveraging a methodological approach that circumvents the challenges of constructing credible counterfactuals for causal inference and allows for disentangling the impact of the EU ETS from other measures on the power sector's abatement efforts, alongside influencing factors such as weather. Specifically, we employ a Bayesian structural time series (BSTS) model, conceptually related to synthetic control techniques, to assess the effectiveness of the three completed phases of the EU ETS (2005-2020) in reducing CO emissions in the power sector across 24 Member States. We analyze the policy implementation effect over the course of each phase by comparing actual power sector emissions with counterfactual estimates derived from contemporaneous predictors related to such emissions. The results indicate a statistically significant emissions reduction in the second and third phases, with no significant reduction in the first phase. The power sector's centrality to the EU ETS, and its critical role in our economies emphasize the importance of our findings in evaluating emissions reduction objectives.

Date: 2026-01
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Published in Ecological Economics, 2026, 239, pp.108784. ⟨10.1016/j.ecolecon.2025.108784⟩

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Persistent link: https://EconPapers.repec.org/RePEc:hal:journl:hal-05363088

DOI: 10.1016/j.ecolecon.2025.108784

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