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Competition effects of mergers: An event study of the German electricity market


  • Keller, Andreas


This paper investigates the competition effects of the entry of Vattenfall into the German electricity market. While the competition authorities supported the entry by approving Vattenfall's acquisition of three regional utilities, other market participants raised concerns over the emergence of an upcoming oligopoly in the German market for power generation. We contrast the efficiency hypothesis postulating pro-competitive effects of mergers with the market power hypothesis postulating anti-competitive effects. For the analysis of the two opposing hypotheses, we use an event study approach to the stock prices of Vattenfall's competitors in the German market. While we find no empirical evidence for increased market power in the German electricity market due to Vattenfall's mergers, there is some indication for efficiency increases. We therefore cannot oppose the view of the competition authorities predicting an overall positive effect for consumers as a result of Vattenfall's entry into the German electricity market.

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  • Keller, Andreas, 2010. "Competition effects of mergers: An event study of the German electricity market," Energy Policy, Elsevier, vol. 38(9), pages 5264-5271, September.
  • Handle: RePEc:eee:enepol:v:38:y:2010:i:9:p:5264-5271

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    References listed on IDEAS

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    Cited by:

    1. Mulder, Machiel & Schoonbeek, Lambert, 2013. "Decomposing changes in competition in the Dutch electricity market through the residual supply index," Energy Economics, Elsevier, vol. 39(C), pages 100-107.
    2. Suphi Sen & Marie-Theres von Schickfus, 2017. "Will Assets be Stranded or Bailed Out? Expectations of Investors in the Face of Climate Policy," ifo Working Paper Series 238, ifo Institute - Leibniz Institute for Economic Research at the University of Munich.
    3. repec:dgr:rugsom:13003-eef is not listed on IDEAS
    4. Kamiński, Jacek, 2014. "A blocked takeover in the Polish power sector: A model-based analysis," Energy Policy, Elsevier, vol. 66(C), pages 42-52.
    5. Kishimoto, Jo & Goto, Mika & Inoue, Kotaro, 2017. "Do acquisitions by electric utility companies create value? Evidence from deregulated markets," Energy Policy, Elsevier, vol. 105(C), pages 212-224.
    6. Pompei, Fabrizio, 2013. "Heterogeneous effects of regulation on the efficiency of the electricity industry across European Union countries," Energy Economics, Elsevier, vol. 40(C), pages 569-585.
    7. Yoo, Kyungjin & Lee, Youah & Heo, Eunnyeong, 2013. "Economic effects by merger and acquisition types in the renewable energy sector: An event study approach," Renewable and Sustainable Energy Reviews, Elsevier, vol. 26(C), pages 694-701.


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