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Transition to Centralized Unit Commitment An Econometric Analysis of Colombia's Experience

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  • Álvaro Riascos, Miguel Bernal, Luciano de Castro and Shmuel Oren

Abstract

This paper attempts to shed light on the relative merits of centralized electricity markets with multipart bids and dispatch using an MIP-based unit commitment optimization approach vs. self-committed markets with linear energy supply curves. We conduct an empirical study of data from the Colombian market, which in 2009 transitioned from a self-commitment paradigm to a centralized unit commitment approach where generators offer a linear supply function for energy along with start-up costs while the commitment and dispatch are determined by the system operator using MIP-based optimization. The results indicate that the transition to centralized dispatch has resulted in productive efficiency gains through a decrease in production costs. However, these gains have not translated into wholesale price decreases; in fact, wholesale prices increased after the change in the dispatch approach. These results suggest that productive efficiency gains have been captured by suppliers through the exercise of market power.

Suggested Citation

  • Álvaro Riascos, Miguel Bernal, Luciano de Castro and Shmuel Oren, 2016. "Transition to Centralized Unit Commitment An Econometric Analysis of Colombia's Experience," The Energy Journal, International Association for Energy Economics, vol. 0(Number 3).
  • Handle: RePEc:aen:journl:ej37-3-oren
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    References listed on IDEAS

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    1. Ramteen Sioshansi & Emma Nicholson, 2011. "Towards equilibrium offers in unit commitment auctions with nonconvex costs," Journal of Regulatory Economics, Springer, vol. 40(1), pages 41-61, August.
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    5. Severin Borenstein & James B. Bushnell & Frank A. Wolak, 2002. "Measuring Market Inefficiencies in California's Restructured Wholesale Electricity Market," American Economic Review, American Economic Association, vol. 92(5), pages 1376-1405, December.
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    Cited by:

    1. Jorge Balat & Juan Esteban Carranza & Juan David Martin & Alvaro Riascos, 2022. "The effects of changes in the regulation of the Colombian wholesale electricity market in a structural model of complex auctions," Borradores de Economia 1211, Banco de la Republica de Colombia.
    2. Jorge Balat & Juan E. Carranza & Juan D. Martin, 2015. "Dynamic and Strategic Behavior in Hydropower-Dominated Electricity Markets: Empirical Evidence for Colombia," Borradores de Economia 12906, Banco de la Republica.
    3. John J. García Rendón & Alex F. Pérez-Libreros, 2019. "El precio spot de la electricidad y la inclusión de energía renovable no convencional: evidencia para Colombia," Documentos de Trabajo de Valor Público 17393, Universidad EAFIT.
    4. Suarez, Carlos, 2022. "Private management and strategic bidding behavior in electricity markets: Evidence from Colombia," Energy Economics, Elsevier, vol. 111(C).
    5. Camelo, Sergio & Papavasiliou, Anthony & de Castro, Luciano & Riascos, Álvaro & Oren, Shmuel, 2018. "A structural model to evaluate the transition from self-commitment to centralized unit commitment," Energy Economics, Elsevier, vol. 75(C), pages 560-572.
    6. Alvaro J. Riascos Villegas & Julian Chitiva & Carlos Salazar, 2022. "Detección de Anomalías y Poder de Mercado en el Sector Eléctrico Colombiano," Borradores de Economia 1217, Banco de la Republica de Colombia.
    7. Perez, Alex & Garcia-Rendon, John J., 2021. "Integration of non-conventional renewable energy and spot price of electricity: A counterfactual analysis for Colombia," Renewable Energy, Elsevier, vol. 167(C), pages 146-161.
    8. Jorge Barrientos Mar n & Fernando Villada, 2020. "Regionalized Discount Rate to Evaluate Renewable Energy Projects in Colombia," International Journal of Energy Economics and Policy, Econjournals, vol. 10(2), pages 332-336.
    9. Jesús M. López-Lezama & David Tobón-Orozco & Esteban Velilla & Jorge Barrientos & Fernando Villada, 2018. "Long-term seasonal forwards in electricity generation markets: an application to Colombia," Revista Cuadernos de Economia, Universidad Nacional de Colombia, FCE, CID, vol. 37(74), pages 287-314, July.
    10. Gallego, Camilo A., 2022. "Intertemporal effects of imperfect competition through forward contracts in wholesale electricity markets," Energy Economics, Elsevier, vol. 107(C).
    11. Karimi, Ali & Tarashandeh, Nader & Kouchakzadeh, Amirmasoud & Kouchakmohseni, Farshad & Naghiloo, Mitra, 2022. "Iran's day-ahead electricity market: Structural assessment and solutions," Utilities Policy, Elsevier, vol. 75(C).
    12. David Rios & Alex Perez & Jaime Carabali & Luis Meneses, 2024. "Poder de mercado y eventos climáticos adversos en un mercado de electricidad hidro-dominado," Borradores de Economia 1266, Banco de la Republica de Colombia.

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