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Market Power in the England and Wales Wholesale Electricity Market 1995-2000

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  • Sweeting, A.
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    Abstract

    This paper shows that generators exercised increasing market power in the England and Wales wholesale electricity market in the second half of the 1990s despite declining market concentration. It examines whether this was consistent with static, non-cooperative oligopoly models, which are widely used to model electricity markets, by testing the static Nash equilibrium assumption that each generator chose its bids to maximise its current profits taking the bids of other generators as given. It finds a significant change in behaviour in late 1996. In 1995 and 1996 generator behaviour was consistent with the static Nash equilibrium assumption if the majority of their output was covered by financial contracts which hedged prices. After 1996 their behaviour was inconsistent with the static Nash equilibrium assumption given their contract cover but it was consistent with tacit collusion.

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    File URL: http://www.econ.cam.ac.uk/electricity/publications/wp/ep55.pdf
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    Bibliographic Info

    Paper provided by Faculty of Economics, University of Cambridge in its series Cambridge Working Papers in Economics with number 0455.

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    Length: 44
    Date of creation: Oct 2004
    Date of revision:
    Handle: RePEc:cam:camdae:0455

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    Web page: http://www.econ.cam.ac.uk/index.htm

    Related research

    Keywords: static oligopoly models; market power; Nash equilibrium; tacit collusion; electricity markets;

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    References

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    1. Green, R., 2004. "‘Did English Generators Play Cournot? Capacity Withholding in the Electricity Pool’," Cambridge Working Papers in Economics 0425, Faculty of Economics, University of Cambridge.
    2. Natalia Fabra & Juan Toro, 2003. "The Fall in British Electricity Prices: Market Rules, Market Structure, or Both?," Industrial Organization 0309001, EconWPA.
    3. Mark Armstrong & Simon Cowan & John Vickers, 1994. "Regulatory Reform: Economic Analysis and British Experience," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262510790, December.
    4. von der Fehr, Nils-Henrik Morch & Harbord, David, 1993. "Spot Market Competition in the UK Electricity Industry," Economic Journal, Royal Economic Society, vol. 103(418), pages 531-46, May.
    5. Green, Richard, 1999. "The Electricity Contract Market in England and Wales," Journal of Industrial Economics, Wiley Blackwell, vol. 47(1), pages 107-24, March.
    6. 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.
    7. Green, Richard & Newbery, David M G, 1991. "Competition in the British Electricity Spot Market," CEPR Discussion Papers 557, C.E.P.R. Discussion Papers.
    8. Natalia Fabra, 2003. "Tacit Collusion in Repeated Auctions: Uniform Versus Discriminatory," Journal of Industrial Economics, Wiley Blackwell, vol. 51(3), pages 271-293, 09.
    9. Severin Borenstein & James B. Bushnell & Frank A. Wolak, 2002. "Measuring Market Inefficiencies in California's Restructured Wholesale Electricity Market," American Economic Review, American Economic Association, vol. 92(5), pages 1376-1405, December.
    10. Rafael Macatangay, 2002. "Tacit Collusion in the Frequently Repeated Multi-Unit Uniform Price Auction for Wholesale Electricity in England and Wales," European Journal of Law and Economics, Springer, vol. 13(3), pages 257-273, May.
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    Cited by:
    1. Roques, F. & Newbery, D.M. & Nuttall, W.J., 2004. "Generation Adequacy and Investment Incentives in Britain: from the Pool to NETA," Cambridge Working Papers in Economics 0459, Faculty of Economics, University of Cambridge.

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