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Capacity credit information


Capacity credit (CC, also capacity value[1] or de-rating factor[2]) is the fraction of the installed capacity of a power plant which can be relied upon at a given time (typically during system stress),[3] frequently expressed as a percentage of the nameplate capacity. A conventional (dispatchable) power plant can typically provide the electricity at full power as long as it has a sufficient amount of fuel and is operational,[1] therefore the capacity credit of such a plant is close to 100%; it is exactly 100% for some definitions of the capacity credit (see below).[4][better source needed] The output of a variable renewable energy (VRE) plant depends on the state of an uncontrolled natural resource (usually the sun or wind), therefore a mechanically and electrically sound VRE plant might not be able to generate at the rated capacity (neither at the nameplate, nor at the capacity factor level) when needed,[1] so its CC is much lower than 100%. The capacity credit is useful for a rough estimate of the firm power a system with weather-dependent generation can reliably provide.[5] For example, with a low, but realistic (cf. Ensslin et al.[6]) wind power capacity credit of 5%, 20 gigawatts (GW) worth of wind power needs to be added to the system in order to permanently retire a 1 GW fossil fuel plant while keeping the electrical grid reliability at the same level.

  1. ^ a b c Dent, Keane & Bialek 2010.
  2. ^ "Resource adequacy in the 2030s".
  3. ^ Jorgenson et al. 2021, p. 1.
  4. ^ Brand, Stambouli & Zejli 2012.
  5. ^ Jorgenson et al. 2021, pp. 1–2.
  6. ^ Ensslin et al. 2008, p. 3.

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