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Impact of tertiary reserve sharing in Portugal


  • Frade, P.M.S.
  • Santana, J.J.E.
  • Shafie-khah, M.
  • Catalão, J.P.S.


Ancillary services play a fundamental role in the operation of electricity systems. In the Iberian Peninsula, since mid-2014, ancillary services have gained a transnational dimension, namely through the introduction of cross-border balancing replacement reserves between the Portuguese and the Spanish Transmission System Operators (TSOs). This paper evaluates the impact of replacement reserves on the Portuguese electricity system, from the onset of this mechanism until the end of 2017, as a new contribution to earlier studies. It also describes the pecuniary impact of tertiary transactions, the identification, and categorization of possible different scenarios of tertiary mobilization, and the respective impact on the internal tertiary mobilization. On the one hand, the Iberian electricity system is one of the most influenced by a high penetration of intermittent renewables, and therefore one of the best candidates to experience increased benefits from the platform. On the other hand, the Portuguese TSO is one of the most peripheral TSOs in Europe that benefits more from the market integration in various dimensions of the electricity sector.

Suggested Citation

  • Frade, P.M.S. & Santana, J.J.E. & Shafie-khah, M. & Catalão, J.P.S., 2018. "Impact of tertiary reserve sharing in Portugal," Utilities Policy, Elsevier, vol. 55(C), pages 167-177.
  • Handle: RePEc:eee:juipol:v:55:y:2018:i:c:p:167-177
    DOI: 10.1016/j.jup.2018.10.008

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    References listed on IDEAS

    1. Dallinger, Bettina & Auer, Hans & Lettner, Georg, 2018. "Impact of harmonised common balancing capacity procurement in selected Central European electricity balancing markets," Applied Energy, Elsevier, vol. 222(C), pages 351-368.
    2. Figueiredo, Nuno Carvalho & Silva, Patrícia Pereira da & Cerqueira, Pedro A., 2015. "Evaluating the market splitting determinants: evidence from the Iberian spot electricity prices," Energy Policy, Elsevier, vol. 85(C), pages 218-234.
    3. Jenkins, J.D. & Zhou, Z. & Ponciroli, R. & Vilim, R.B. & Ganda, F. & de Sisternes, F. & Botterud, A., 2018. "The benefits of nuclear flexibility in power system operations with renewable energy," Applied Energy, Elsevier, vol. 222(C), pages 872-884.
    4. González-Aparicio, I. & Kapetaki, Z. & Tzimas, E., 2018. "Wind energy and carbon dioxide utilisation as an alternative business model for energy producers: A case study in Spain," Applied Energy, Elsevier, vol. 222(C), pages 216-227.
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    Cited by:

    1. Edmunds, Calum & Martín-Martínez, Sergio & Browell, Jethro & Gómez-Lázaro, Emilio & Galloway, Stuart, 2019. "On the participation of wind energy in response and reserve markets in Great Britain and Spain," Renewable and Sustainable Energy Reviews, Elsevier, vol. 115(C).


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