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This week in data:

Carbon Brief analysis recently showed that fossil fuels supplied a record-low 2.4% of electricity on the island of Great Britain, for one hour on Monday 15 April.

Yet, despite there being increasingly frequent periods with hardly any electricity coming from fossil fuels, there are still times when gas power remains essential for the GB grid.

The figure shows the distribution of half-hours in each year since 2009, arranged according to the share of fossil fuels during each time period.

Periods when the grid was more than 50% reliant on fossil fuels are shaded red and, reading from top to bottom, these have become increasingly rare over the past 15 years. Conversely, periods with less than 50% fossil fuel, shaded blue, are becoming increasingly common.

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