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Adjusting the aim of capacity mechanisms: Future-proof reliability metrics and firm supply calculations

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  • Brito-Pereira, Paulo
  • Mastropietro, Paolo
  • Rodilla, Pablo
  • Barroso, Luiz Augusto
  • Batlle, Carlos

Abstract

Capacity mechanisms are now deemed a regulatory mainstay in liberalised power system decarbonisation. These instruments aim to ensure sufficient resource adequacy with a mix able to meet the reliability target set by the regulator. Remuneration in capacity mechanisms depends on so-called firm supply (calculated from de-rating factors or capacity credits), taken as a proxy for each resource’s expected long-term contribution to system adequacy. Most adequacy assessment and de-rating methods used to calculate security of supply were developed for power systems very different from today’s and tomorrow’s, in which renewables account for a higher share of the mix and demand is more elastic. Regulators the world over are already revising these methods, although that seldom involves an overall rethink of their general approach. Drawing from theoretical considerations and international best practice, this article defines an updated theoretical framework for the resource adequacy problem against the backdrop of the challenges ahead for the power sector. The conclusions include recommendations for resilient reliability metrics and de-rating calculation methods.

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  • Brito-Pereira, Paulo & Mastropietro, Paolo & Rodilla, Pablo & Barroso, Luiz Augusto & Batlle, Carlos, 2022. "Adjusting the aim of capacity mechanisms: Future-proof reliability metrics and firm supply calculations," Energy Policy, Elsevier, vol. 164(C).
    • Handle: RePEc:eee:enepol:v:164:y:2022:i:c:s0301421522001161
    DOI: 10.1016/j.enpol.2022.112891
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    1. Chaves, J. P. & Cossent, R. & Gómez San Román, T. & Linares, P. & Rivier, M., 2023. "An assessment of the European electricity market reform options and a pragmatic proposal," Cambridge Working Papers in Economics 2325, Faculty of Economics, University of Cambridge.
    2. Mastropietro, Paolo & Rodilla, Pablo & Rivier, Michel & Batlle, Carlos, 2024. "Reliability options: Regulatory recommendations for the next generation of capacity remuneration mechanisms," Energy Policy, Elsevier, vol. 185(C).
    3. Christos K. Simoglou & Pandelis N. Biskas, 2023. "Capacity Mechanisms in Europe and the US: A Comparative Analysis and a Real-Life Application for Greece," Energies, MDPI, vol. 16(2), pages 1-32, January.
    4. Brito-Pereira, Paulo & Rodilla, Pablo & Mastropietro, Paolo & Batlle, Carlos, 2022. "Self-fulfilling or self-destroying prophecy? The relevance of de-rating factors in modern capacity mechanisms," Applied Energy, Elsevier, vol. 314(C).
    5. J.P. Chaves & R. Cossent & T. Gómez San Román & P. Linares & M. Rivier, 2023. "An assessment of the European electricity market reform options and a pragmatic proposal," Working Papers EPRG2305, Energy Policy Research Group, Cambridge Judge Business School, University of Cambridge.
    6. Huclin, Sébastien & Ramos, Andrés & Chaves, José Pablo & Matanza, Javier & González-Eguino, Mikel, 2023. "A methodological approach for assessing flexibility and capacity value in renewable-dominated power systems: A Spanish case study in 2030," Energy, Elsevier, vol. 285(C).

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