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How the choice of multi-gas equivalency metrics affects mitigation options: The case of CO2 capture in a Brazilian coal-fired power plant

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  • Moura, Maria Cecilia P.
  • Branco, David A. Castelo
  • Peters, Glen P.
  • Szklo, Alexandre Salem
  • Schaeffer, Roberto

Abstract

This study shows how the assessment of emissions reductions from CO2 capture is critically dependent on the choice of multi-gas equivalency metric and climate impact time horizon. This has implications for time-sensitive mitigation policies, in particular when considering relative impact of short-lifetime gases. CO2, CH4 and N2O emissions from a coal-fired power plant in Brazil are used to estimate and compare the CO2-equivalent emissions based on standard practice global warming potentials GWP-100 with the less common GWP-50 and variable GWP for impact target years 2050 and 2100. Emission reductions appear lower for the variable metric, when the choice of target year is critical: 73% in 2100 and 60% in 2050. Reductions appear more favorable using a metric with a fixed time horizon, where the choice of time horizon is important: 77% for GWP-100 and 71% for GWP-50. Since CH4 emissions from mining have a larger contribution in the total emission of a plant with capture compared to one without, different perspectives on the impact of CH4 are analyzed. Use of variable GWP implies that CH4 emissions appear 39% greater in 2100 than with use of fixed GWP and 91% greater in 2050.

Suggested Citation

  • Moura, Maria Cecilia P. & Branco, David A. Castelo & Peters, Glen P. & Szklo, Alexandre Salem & Schaeffer, Roberto, 2013. "How the choice of multi-gas equivalency metrics affects mitigation options: The case of CO2 capture in a Brazilian coal-fired power plant," Energy Policy, Elsevier, vol. 61(C), pages 1357-1366.
    • Handle: RePEc:eee:enepol:v:61:y:2013:i:c:p:1357-1366
    DOI: 10.1016/j.enpol.2013.05.097
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    4. Portugal-Pereira, Joana & Köberle, Alexandre C. & Soria, Rafael & Lucena, André F.P. & Szklo, Alexandre & Schaeffer, Roberto, 2016. "Overlooked impacts of electricity expansion optimisation modelling: The life cycle side of the story," Energy, Elsevier, vol. 115(P2), pages 1424-1435.

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