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Characterization of Bidding Zone Robustness under Medium and Long-Term System Evolution Scenarios

In line with several European legislations, academic and industry representatives are considering revising bidding zones as a means to both improve the coupling of European wholesale electricity markets and ensure efficient operating conditions for the interconnected transmission system. As energy transition objectives foster a quick and profound transformation of the electric industry, a comprehensive, multi-dimensional approach is needed in order to assess the short to long-term impacts of a zone revision on system operation, market efficiency and investment dynamics. Zone robustness to medium and long-term system evolutions would therefore be essential in building consensus. In this paper, we provide a methodology to assess bidding zone robustness to evolutions of the corresponding power system. We then apply it to a generic 30-bus model by introducing minor and more structural variations in the generation mix, grid topology and demand distribution, so as to capture different time scales.