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How Intermittent Is Wind Power?

By Paul Homewood | Not A Lot Of People Know That | May 1, 2015

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According to Gridwatch, wind power averaged 1901GW during April, some 5.9% of UK total demand. Hardly awe inspiring, but the reality is really far, far worse, as this average hides huge variations within the month, as the chart below makes clear. (The Grid reports at 5-minute intervals).

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http://www.gridwatch.templar.co.uk/

As the wind ebbed and flowed, wind’s contribution ranged from a low of 79MW, or 0.2% of demand, up to 21.2%. Even within a day, there have still been huge variability, for instance on the 26th:

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During the month, less than 1% of demand was being supplied by wind on 789 occasions, i.e. 9% of the time, For 34% of the time, it failed to exceed 3% contribution.

While wind farms are still no more than Mickey Mouse operations within the overall UK mix, the National Grid can cope with this sort of variability. When, however, wind capacity is tripled or quadrupled, as is the plan in the not so distant future, it will be another story.

May 4, 2015 - Posted by | Economics |

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