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An Empirical Analysis of the Impact of Hedge Contracts on Bidding Behavior in a Competitive Electricity Market

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  • Frank Wolak
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    Abstract

    A major concern in the design of wholesale electricity markets is the potential for the exercise of market power by generating unit owners. To better understand the determinants of generating unit owner market power and how it is exercised, this paper derives a model of bidding behavior in a competitive electricity market which incorporates various sources of uncertainty and the impact of the electricity generator's position in the financial hedge contract market on its expected profit-maximizing bidding behavior. The model is first used to characterize the profit-maximizing market price that a generator would like set by its bidding strategy for several hedge contract and spot sales combinations. This model is applied to bid and contract data obtained from the first three months of operation of the National Electricity Market (NEM1) in Australia. This analysis illustrates the sensitivity of expected profit-maximizing bidding strategies to the amount of financial hedge contracts held by the generating unit owner. It also provides strong evidence for the effectiveness of financial hedge contracts as a means to mitigate market power during the initial stages of operation of a wholesale electricity market. [L 94]

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    Article provided by Taylor & Francis Journals in its journal International Economic Journal.

    Volume (Year): 14 (2000)
    Issue (Month): 2 ()
    Pages: 1-39

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    Handle: RePEc:taf:intecj:v:14:y:2000:i:2:p:1-39

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    1. Klemperer, Paul D & Meyer, Margaret A, 1989. "Supply Function Equilibria in Oligopoly under Uncertainty," Econometrica, Econometric Society, vol. 57(6), pages 1243-77, November.
    2. Green, Richard, 1999. "The Electricity Contract Market in England and Wales," Journal of Industrial Economics, Wiley Blackwell, vol. 47(1), pages 107-24, March.
    3. Green, Richard & Newbery, David M G, 1991. "Competition in the British Electricity Spot Market," CEPR Discussion Papers 557, C.E.P.R. Discussion Papers.
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