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Cournot versus Supply Functions: What does the data tell us?

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  • Willems, Bert
  • Rumiantseva, Ina
  • Weigt, Hannes

Abstract

This paper compares two popular models of oligopolistic electricity markets, Cournot and the Supply Function Equilibrium (SFE), and then tests which model best describes the observed market data. Using identical demand and supply specifications, both models are calibrated to the German electricity market by varying the contract cover of firms. Our results show that each model explains almost the same fractions of the observed price variations. We therefore suggest using Cournot models for short-term analysis, since these models can accommodate additional market details, such as network constraints, and the SFE model for long-term analysis (e.g., the study of a merger) since it is less sensitive to the calibration parameters selected.

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Bibliographic Info

Article provided by Elsevier in its journal Energy Economics.

Volume (Year): 31 (2009)
Issue (Month): 1 (January)
Pages: 38-47

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Handle: RePEc:eee:eneeco:v:31:y:2009:i:1:p:38-47

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Web page: http://www.elsevier.com/locate/eneco

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Keywords: Supply Function Equilibrium Cournot competition Electricity markets;

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  8. James B. Bushnell & Erin T. Mansur & Celeste Saravia, 2007. "Vertical Arrangements, Market Structure, and Competition An Analysis of Restructured U.S. Electricity Markets," NBER Working Papers 13507, National Bureau of Economic Research, Inc.
  9. Jordi Brandts & Paul Pezanis-Christou & Arthur Schram, 2003. "Competition with Forward Contracts: A Laboratory Analysis Motivated by Electricity Market Design," Levine's Bibliography 666156000000000172, UCLA Department of Economics.
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  11. Ciarreta, Aitor & Gutierrez-Hita, Carlos, 2006. "Supply function vs. quantity competition in supergames," International Journal of Industrial Organization, Elsevier, vol. 24(4), pages 773-783, July.
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  13. Hu, X. & Ralph, D. & Ralph, E.K. & Bardsley, P. & Ferris, M.C., 2004. "Electricity Generation with Looped Transmission Networks: Bidding to an ISO," Cambridge Working Papers in Economics 0470, Faculty of Economics, University of Cambridge.
  14. Bolle, Friedel, 1992. "Supply function equilibria and the danger of tacit collusion : The case of spot markets for electricity," Energy Economics, Elsevier, vol. 14(2), pages 94-102, April.
  15. Borenstein, Severin & Bushnell, James & Knittel, Chris, 1999. "Market Power in Electricity Markets: Beyond Concentration Measures," Staff General Research Papers 31548, Iowa State University, Department of Economics.
  16. Green, Richard J, 1996. "Increasing Competition in the British Electricity Spot Market," Journal of Industrial Economics, Wiley Blackwell, vol. 44(2), pages 205-16, June.
  17. Delgado, Juan & Moreno, Diego, 2004. "Coalition-proof supply function equilibria in oligopoly," Journal of Economic Theory, Elsevier, vol. 114(2), pages 231-254, February.
  18. Ventosa, Mariano & Baillo, Alvaro & Ramos, Andres & Rivier, Michel, 2005. "Electricity market modeling trends," Energy Policy, Elsevier, vol. 33(7), pages 897-913, May.
  19. Neuhoff, Karsten & Barquin, Julian & Boots, Maroeska G. & Ehrenmann, Andreas & Hobbs, Benjamin F. & Rijkers, Fieke A.M. & Vazquez, Miguel, 2005. "Network-constrained Cournot models of liberalized electricity markets: the devil is in the details," Energy Economics, Elsevier, vol. 27(3), pages 495-525, May.
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