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The capacity credit of micro-combined heat and power

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  • Hawkes, A.D.
  • Leach, M.A.

Abstract

This article is concerned with development of a methodology to determine the capacity credit of micro-combined heat and power (micro-CHP), and application of the method for the UK. Capacity credit is an important parameter in electricity system planning because it measures the amount of conventional generation that would be displaced by an alternative technology. Firstly, a mathematical formulation is presented. Capacity credit is then calculated for three types of micro-CHP units--Stirling engine, internal combustion engine, and fuel cell systems--operating under various control strategies. It is found that low heat-to-power ratio fuel cell technologies achieve the highest capacity credit of approximately 85% for a 1.1Â GW penetration when a heat-led control strategy is applied. Higher heat-to-power ratio Stirling engine technology achieves approximately 33% capacity credit for heat-led operation. Low heat-to-power ratio technologies achieve higher capacity credit because they are able to continue operating even when heat demand is relatively low. Capacity credit diminishes as penetration of the technology increases. Overall, the high capacity credit of micro-CHP contributes to the viewpoint that the technology can help meet a number of economic and environmental energy policy aims.

Suggested Citation

  • Hawkes, A.D. & Leach, M.A., 2008. "The capacity credit of micro-combined heat and power," Energy Policy, Elsevier, vol. 36(4), pages 1457-1469, April.
    • Handle: RePEc:eee:enepol:v:36:y:2008:i:4:p:1457-1469
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    1. Hawkes, A.D. & Leach, M.A., 2008. "On policy instruments for support of micro combined heat and power," Energy Policy, Elsevier, vol. 36(8), pages 2963-2972, August.
    2. Moisés Costa, Paulo & Matos, Manuel A., 2010. "Capacity credit of microgeneration and microgrids," Energy Policy, Elsevier, vol. 38(10), pages 6330-6337, October.
    3. Tapia-Ahumada, K. & Pérez-Arriaga, I.J. & Moniz, E.J., 2013. "A methodology for understanding the impacts of large-scale penetration of micro-combined heat and power," Energy Policy, Elsevier, vol. 61(C), pages 496-512.

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