Demand Elasticity and Market Power in the Spanish Electricity Market
In this paper we check whether generators' bid behavior at the Spanish wholesale electricity market is consistent with the hypothesis of pro?fit maximization on their residual demands. Using OMEL data, we ?find the arc-elasticity of the residual demand around the system marginal price. The results suggest that the larger ?firms are not actually pro?fit-maximizing on their residual demands while smaller generators' behavior is consistent with profit maximization. We argue how the regulatory environment may drive these results. Finally, we repeat the analysis for the ?first session of the intra-day market where presumably ?firms may not have the same incentives as in the day-ahead market
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