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The RES-Induced Switching Effect Across Fossil Fuels: An Analysis of Day-Ahead and Balancing Prices

The empirical literature on electricity markets has highlighted a strong cointegrating relationship governing the dynamics of electricity and fuel prices. More recently the massive introduction of RES in electricity generation, fostered by generous supporting schemes, has influenced the shape and position of the supply function and consequently the equilibrium prices. We believe that the new competitive scenario may have influenced the fuel-electricity nexus with a different impact in day-ahead and balancing markets. Empirical evidence of the evolving fuels-electricity nexus is shown looking at one Italian zone across two samples characterized by a significant change in the level of RES penetration. We conduct the analysis taking into account both day-ahead and, for the first time, balancing market sessions. Results indicate that fuel prices are much less relevant in determining the dynamics of electricity prices in recent years characterized by high RES penetration. On the contrary, taking into account flexible thermal sources, we show that in the second sample balancing and fuel prices (especially gas) are in a long run equilibrium.

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Keywords: Renewable sources, Electricity, Coal, Oil, Gas, Cointegration

DOI: 10.5547/01956574.40.1.agia

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Published in Volume 40, The New Era of Energy Transition of the bi-monthly journal of the IAEE's Energy Economics Education Foundation.


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