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Market Power in Electricity Markets: Beyond Concentration Measures

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  • Severin Borenstein
  • James Bushnell
  • Christopher R. Knittel

Abstract

The wave of electricity market restructuring both within the United States and abroad has brought the issue of horizontal market power to the forefront of energy policy. Traditionally, estimation and prediction of market power has relied heavily on concentration measures. In this paper, we discuss the weaknesses of concentration measures as a viable measure of market power in the electricity industry, and we propose an alternative method based oil market simulations that take advantage of existing plant level data. We discuss results from previous studies the authors have performed, and present new results that allow for the detection of threshold demand levels where market power is likely to be a problem. In addition, we analyze the impact of that recent divestitures in the California electricity market will have on estimated market power. We close with a discussion of the policy implications of the results.

Suggested Citation

  • Severin Borenstein & James Bushnell & Christopher R. Knittel, 1999. "Market Power in Electricity Markets: Beyond Concentration Measures," The Energy Journal, International Association for Energy Economics, vol. 0(Number 4), pages 65-88.
    • Handle: RePEc:aen:journl:1999v20-04-a03
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    JEL classification:

    • F0 - International Economics - - General

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