The impact of alternative relevant market on concentration

An empirical analysis on the French electricity market

5th March 2009, from 10 am to 12 pm.

GIS LARSEN, Campus de Fontenay

Speakers : D. Perrot and G. Zachmann (LARSEN)

Abstract : The aim of this study is to show the impact of European electric markets integration on the value of the most frequently used concentration indicator, i.e. the HHI (Herfindahl-Hirschman Index), applied to the French case. The prices of the different European Electricity markets allow us to determine the probability of coupling between the French market and the nearby markets (Belgium, Netherlands, Germany, Spain and Italy). We can then attribute different probabilities in three alternative measures of HHI, which correspond to three situations of the French market: isolated, interconnected, integrated.The results show very important variations in terms of concentration indicators as the value of the HHI can vary from 6457 to 979, indicating a structure of market going from strongly concentrated to an absence of concentration.

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