We investigate cross-border dynamics between the Spanish and French electricity markets in the light of EU’s market integration. The analysis is highly relevant given the isolation of the Iberian Peninsula from the rest of European markets and its unique electricity market design. Results show the shift in the merit order curve in each market. Electricity prices in Spain follow the dynamics of the French ones, fostered by Spain’s import-dependence. Benefits of grid integration are asymmetric, with Spanish users taking advantage of the market integration with France. The substitution effect between domestic fuel-based units and imported green electricity allows Spain to further decarbonize its energy mix and increase the security of supply. The expansion of the cross-border grid until 2030 will be key for a successful phasing out of the remaining coal-based units. Our findings should be considered in support schemes for integration projects to align the incentives of participants.
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