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Capacity factor: Difference between revisions
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==Capacity value== | ==Capacity value== | ||
Grid operators have to be able to call on the various generating plants as needed to meet demand. The ability to do so can be expressed as a plant’s ''capacity value'', the percentage of time that it can be called on to provide power to the grid. | Grid operators have to be able to call on the various generating plants as needed to meet demand. The ability to do so can be expressed as a plant’s ''capacity value'', the percentage of time that it can be called on to provide power to the grid. It is a measure of dispatchability. The capacity value of most plants is effectively 100%. | ||
Wind turbines can not be “called on” except by the wind, which has only a random relationship to user demand for electricity.<ref>https://wind-watch.org/pix/displayimage.php?pid=494</ref><ref>https://wind-watch.org/pix/displayimage.php?pid=493</ref><ref>https://wind-watch.org/pix/displayimage.php?pid=660</ref><ref>https://wind-watch.org/pix/displayimage.php?pid=73</ref> Therefore, their capacity value is effectively zero. This means that to meet the needs of the grid, other – dispatchable – sources have to be maintained and built | Wind turbines, however, can not be “called on” except by the wind, which has only a random relationship to user demand for electricity.<ref>https://wind-watch.org/pix/displayimage.php?pid=494</ref><ref>https://wind-watch.org/pix/displayimage.php?pid=493</ref><ref>https://wind-watch.org/pix/displayimage.php?pid=660</ref><ref>https://wind-watch.org/pix/displayimage.php?pid=73</ref> Therefore, their capacity value is effectively zero. This means that to meet the needs of the grid, other – dispatchable – sources have to be maintained and built just as if wind turbines were not on the grid. | ||
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