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Solar Beats Coal for Entire Month in UK for First Time

Energy

The UK’s solar panels generated more electricity than coal in May 2016, the first-ever calendar month to pass the milestone, Carbon Brief analysis shows.

Solar generated an estimated 1,336 gigawatt hours (GWh) of electricity in May, 50 percent more than the 893 GWh output from coal. The finding follows on from Carbon Brief’s earlier analysis showing solar beating coal for the first full day on April 9 and for the first week from May 3.

The UK’s solar panels generated more electricity than coal in May 2016, the first-ever calendar month to pass the milestone, Carbon Brief analysis shows. Photo credit: Greenpeace UK

While these milestones are largely symbolic, they do highlight the major changes going on in the UK electricity system. For further context, analysis and data details see the previous coverage from Carbon Brief.

UK Monthly Electricity from Solar and Coal

The chart below shows that solar generated 50 percent more electricity than coal during May 2016. This was due to a combination of low coal output and the impact of longer days as summer approaches.

Total electricity generation from UK solar and coal during the calendar months April and May 2016, gigawatt hours (GWh). Sources: Sheffield Solar and Gridwatch. Chart by Carbon Brief.

Solar and Coal Shares of UK Total

Solar generated nearly 6 percent of the UK’s electricity needs during May, against less than 4 percent for coal (see note below for details of this calculations). In January, the figures were just 1 percent for solar and 17 percent for coal.

There has been a huge reduction in coal-fired power generation in the UK since the start of 2016, as the chart below shows. Nearly a quarter of electricity generation in 2015 was from coal but since the, power market economics have shifted in favor of gas and several coal plants have opted to close.

Shares of total UK electricity generation met by solar and coal during January to May 2016 (%). Sources: Sheffield Solar and Gridwatch. Chart by Carbon Brief.

UK Weekly Electricity From Solar and Coal

Solar has generated more electricity than coal in each of the past five weeks. Note that coal generation increased around the start of June as a result of low wind power output.

Total electricity generation from UK solar and coal during each week between April 1 and June 2, gigawatt hours (GWh). Sources: Sheffield Solar and Gridwatch. Chart by Carbon Brief.

UK Daily Electricity From Solar and Coal 

Although solar has cumulatively outpaced coal in each week since the end of April, coal has topped solar on some days in May, as the chart below shows.

The UK passed a historic milestone in mid-May as coal output hit zero on seven periods across the week commencing Monday, May 9. Total daily coal output was near zero during May 12-14. The zero-coal periods were reported by the Financial Times, the Press Association, the Telegraph and others, citing Carbon Brief analysis.

Total electricity generation from UK solar and coal on each day between April 1 and June 6, gigawatt hours (GWh). Sources: Sheffield Solar and Gridwatch. Chart by Carbon Brief.

Notes: The figures for shares of total UK electricity generation are estimates. They only include solar generation and other forms of generation that are connected to the transmission grid network. Embedded generation from wind or other sources is not centrally metered and data is not available. However, this missing data will not alter the relative positions of solar and coal generation.

Figures for solar output in the UK are estimates produced by Sheffield Solar. The project recently updated its estimates of installed UK solar capacity.

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