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The electricity spot markets can be considered as capacity constrained markets (Kreps and Scheinkman, 1983), where market price definition depends on the quantity strategies. In this theoretical framework, the main target of the present paper is to show to what extent a spot market organized like a Uniform Price Auction (UPA) is naturally inclined to develop anti-competitive practices, in particular through quantity strategies. To achieve this objective, multivariable models are defined for each daily demand period of the Iberian electricity market. Each model correlates the hourly market price change and the bid quantities of the two main Iberian producers (Endesa and Iberdrola), for every summer between 2001 and 2004. To apply those models one has to solve the endogeneity problem.
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