By Simon Evans
Saturday, April 9 was the first-ever day where more electricity was generated in the UK by solar than by coal. May 2016 was the first-ever month. The three months from June through to September was the first-ever quarter. And now the six months to September is the first half year.
The UK's pioneering community energy project, Westmill Solar Park and Wind Farm in Oxfordshire, England.Richard Peat via Flickr (CC BY-NC-ND)
These firsts reflect the changing face of UK electricity supplies, with solar capacity having nearly doubled during 2015. They also reflect historic lows for coal-fired generation, driven by changes in wholesale energy markets and the carbon price floor. Carbon Brief runs through the numbers.
Solar Six Months
The UK's solar panels generated an estimated 6,964 gigawatt hours (GWh) of electricity during quarter two (Q2) and three (Q3) of 2016, from April through to September. (See note below regarding data sources and methodology).
The solar output was equivalent to 5.2 percent of UK electricity demand for the half-year period. It was nearly 10 percent higher than the 6,342 GWh generated by coal, which covered 4.7 percent of demand.
Starting on July 1, there were 10 straight weeks when solar output exceeded that from coal.
Solar output is strongly affected by the UK's seasonal cycle. Roughly three-quarters of annual UK solar power is generated during the sunnier half-year from April to September. In contrast, coal generation tends to increase in winter when electricity demand peaks.
The chart below shows these contrasting seasonal cycles. It also shows two contrasting broader trends.
First, UK solar capacity has to date reached around 12 gigawatts (GW), according to research by Solar Intelligence, up from around 6GW at the start of 2015. Solar generation is increasing as a result, up 26 percent in 2016 to date, compared to the same period in 2015.
(Note that solar capacity additions have fallen this year, following subsidy cuts. Note also that while government figures for new capacity have been consistently too low, independent estimates also show the drop.)
Total electricity generation from UK solar and coal during calendar months in 2015 and 2016 to date, gigawatt hours (GWh). Sources: Sheffield Solar and Gridwatch. Chart by Carbon Brief using Highcharts.
Second, the chart shows how coal generation has fallen rapidly, at a rate that is far beyond its usual annual cycle. Output in 2016 to date was 65 percent below that in 2015. It was down 76 percent in Q2 and 82 percent in Q3 compared to a year earlier.
This year also saw UK coal generation fall to zero on April 9, for the first time since 1882, when a coal-fired power station started supplying electricity to the public for the first time. Since then, there have been 199 hours when coal was generating no power in the UK.
The drop in coal output has come about because of wholesale energy market price shifts being more favorable to gas-fired generators than to coal. In addition, the UK's carbon floor price doubled in April 2015, again shifting the economics of electricity generation in favor of gas over coal.
The key role of the carbon floor price in driving coal off the system is underlined in recent analysis from consultancy Cornwall Energy. This shows that removing the UK's top-up carbon tax would mean coal plants once again being cheaper to run than gas.
Tom Edwards, Cornwall Energy senior consultant writes:
"This would return the market to the position seen in 2014 when coal-fired generators were running baseload [all the time] and gas-fired stations were pushed to the margin."
It's worth noting that while gas-fired power stations have replaced most of the reduction in coal output, the total supplied by the two fossil fuels is also falling. This is because of increases in electricity supplied by renewables and imports, along with falling demand.
Methods: 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. Its estimates scale real live data obtained from 324 solar sites around the UK.
Carbon Brief analysis shows the Sheffield Solar estimates to have a very small average error of 4%, compared to official government figures for solar generation since the start of 2015.
Reposted with permission from our media associate Carbon Brief.
To save the planet, we must save the Amazon rainforest. To save the rainforest, we must save its indigenous peoples. And to do that, we must demarcate their land.
A new EarthxTV film special calls for the protection of the Amazon rainforest and the indigenous people that call it home. EarthxTV.org
- Meet the 'Women Warriors' Protecting the Amazon Forest - EcoWatch ›
- Indigenous Tribes Are Using Drones to Protect the Amazon ... ›
- Amazon Rainforest Will Collapse by 2064, New Study Predicts ... ›
- Deforestation in Amazon Skyrockets to 12-Year High Under Bolsonaro ›
- Amazon Rainforest on the Brink of Turning Into a Net Carbon Emitter ... ›
EcoWatch Daily Newsletter
By Anke Rasper
"Today's interim report from the UNFCCC is a red alert for our planet," said UN Secretary General Antonio Guterres.
The report, released Friday, looks at the national climate efforts of 75 states that have already submitted their updated "nationally determined contributions," or NDCs. The countries included in the report are responsible for about 30% of the world's global greenhouse gas emissions.
- World Leaders Fall Short of Meeting Paris Agreement Goal - EcoWatch ›
- UN Climate Change Conference COP26 Delayed to November ... ›
- 5 Years After Paris: How Countries' Climate Policies Match up to ... ›
- Biden Win Puts World 'Within Striking Distance' of 1.5 C Paris Goal ... ›
- Biden Reaffirms Commitment to Rejoining Paris Agreement ... ›
India's New Delhi has been called the "world air pollution capital" for its high concentrations of particulate matter that make it harder for its residents to breathe and see. But one thing has puzzled scientists, according to The Guardian. Why does New Delhi see more blinding smogs than other polluted Asian cities, such as Beijing?
- This Indian Startup Turns Polluted Air Into Climate-Friendly Tiles ... ›
- How to Win the Fight Against Plastic - EcoWatch ›
In a historic move, the Delaware River Basin Commission (DRBC) voted Thursday to ban hydraulic fracking in the region. The ban was supported by all four basin states — New Jersey, Delaware, Pennsylvania and New York — putting a permanent end to hydraulic fracking for natural gas along the 13,539-square-mile basin, The Philadelphia Inquirer reported.
- Appalachian Fracking Boom Was a Jobs Bust, Finds New Report ... ›
- Long-Awaited EPA Study Says Fracking Pollutes Drinking Water ... ›
- Pennsylvania Fracking Water Contamination Much Higher Than ... ›
Colombia is one of the world's largest producers of coffee, and yet also one of the most economically disadvantaged. According to research by the national statistic center DANE, 35% of the population in Columbia lives in monetary poverty, compared to an estimated 11% in the U.S., according to census data. This has led to a housing insecurity issue throughout the country, one which construction company Woodpecker is working hard to solve.
- Kenyan Engineer Recycles Plastic Into Bricks Stronger Than ... ›
- Could IKEA's New Tiny House Help Fight the Climate Crisis ... ›