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Towards objective evaluation of the accuracy of marginal emissions factors

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  • Koebrich, Sam
  • Cofield, Joel
  • McCormick, Gavin
  • Saraswat, Ishan
  • Steinsultz, Nat
  • Christian, Pierre

Abstract

Marginal Emission Factors are a modeled quantity that measures how a change in demand on the electrical grid affects overall system emissions by considering the carbon intensity of generator(s) that would respond to this change. It is reasonably impossible to record ground truth Marginal Emission Factors, preventing any validation of these models using standard techniques. However, many decision makers are using Marginal Emissions Factors to decide how to optimize load, or where to build new renewable generation to reduce CO2 emissions consistent with the UN Framework Convention on Climate Change Paris Agreement. This paper provides a rubric of empirical tests to evaluate various Marginal Emission Factor models by considering observable behaviors that marginal Emission Factor models would be expected to emulate. This presents a novel step towards the full validation of these models. The rubric of tests is then applied to seven popular Marginal Emission Factor models. The results of this analysis show that models based on simulated results, rather than real-time information, tend to violate the tests more often but still present value when deciding the best location to site new load or generation. Only one model (WattTime), passes all of the proposed tests, however all models demonstrate general alignment with the expectations of the tests.

Suggested Citation

  • Koebrich, Sam & Cofield, Joel & McCormick, Gavin & Saraswat, Ishan & Steinsultz, Nat & Christian, Pierre, 2025. "Towards objective evaluation of the accuracy of marginal emissions factors," Renewable and Sustainable Energy Reviews, Elsevier, vol. 215(C).
    • Handle: RePEc:eee:rensus:v:215:y:2025:i:c:s1364032125001819
    DOI: 10.1016/j.rser.2025.115508
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    References listed on IDEAS

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    1. Stephen P. Holland & Matthew J. Kotchen & Erin T. Mansur & Andrew J. Yates, 2022. "Why marginal CO 2 emissions are not decreasing for US electricity: Estimates and implications for climate policy," Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, vol. 119(8), pages 2116632119-, February.
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    1. Ullah, Sami & Lin, Boqiang, 2025. "Unpacking the role of green supply chain and renewable energy innovation in advancing environmental sustainability: A Quantile-Based approach," Renewable and Sustainable Energy Reviews, Elsevier, vol. 218(C).

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