UK Fuel Mix

UK Fuel Mix. What’s it all about?

Last updated: 4 December 2019

Next data release date:  October 2020

All energy suppliers in the Great Britain) are required to provide information about the mix of fuels they use to generate the electricity they supply to their customers. They also need to disclose the environmental impact of this fuel mix.

This information is known as the Fuel Mix Disclosure and is published annually. Aggregate data for the UK is published by the Department of Business, Energy & Industrial Strategy (BEIS).

The requirement on all electricity suppliers in Great Britain to disclose to their customers the mix of fuels used to generate the electricity they sell was introduced in the Electricity (Fuel Mix Disclosure) Regulations 2005 (SI 2005 No. 391). The disclosure period runs from 1 April in one year through to 31 March in the following year. Energy suppliers must disclose this information by 1 October annually. The requirement only applies where electricity is supplied for a full disclosure period. So, an energy supplier that began supplying electricity part way through a year is exempt from the disclosure in their first year of operation.

Please note that the overall carbon emission levels shown in the tables below will differ slightly from previously published figures. The calculation basis of BEIS (previously DECC) pubished data has changed over time and so is not strictly comparable. The figures shown below have been recalculated by energyscanner.com using fuel source usage multiplied by the carbon emission of the fuel source. As such the figures are comparable over time. It should however be noted that differences are in any case small, typically only 1-2%.

Please also note that BEIS no longer publish the early historic figures so you can only find them…. here.

Shown below is the aggregated UK (excluding Northern Ireland) Fuel Mix Disclosure for the latest reporting year. We will update this page with the latest Fuel Mix Disclosures as they become available.

UK Fuel Mix 2018/2019

The table below shows the UK Fuel Mix Disclosure for the period 1 April 2017 to 31 March 2018.

Energy SourceUK Average
Source: BEIS
Coal5.2%
Natural gas41.4%
Nuclear18.7%
Renewables32.8%
Other fuels1.9%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
Coal920
Natural Gas349
Nuclear0
Renewables0
Other871
CO2 emissions - overall average208
High-level radioactive waste (g/kWh)0.007

The main changes compared to the previous year where another increase in electricity generation from renewables (+13%) and falls in the use of coal and nuclear.

Renewables, at almost 33%, are the second largest source of electricity generation behind gas. However, gas, at 41%, remains firmly and stubbornly stuck in the top spot.

Carbon dioxide emissions per unit of electricity generated fell for the 6th year in a row, but only by 10%. Carbon dioxide emissions per unit of electricity generated are now less than half the level of 5 years ago.

UK Fuel Mix 2017/2018

The table below shows the UK Energy Fuel Mix Disclosure for the period 1 April 2017 to 31 March 2018.

Energy SourceUK Average
Source: BEIS
Coal7.64%
Natural gas41.24%
Nuclear20.01%
Renewables29.04%
Other fuels2.07%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
Coal918
Natural Gas357
Nuclear0
Renewables0
Other691
CO2 emissions - overall average232
High-level radioactive waste (g/kWh)0.007

The only notable change on the year was that electricity generation from renewables grew another 20% with each of the other fuel sources falling as a result.

Carbon dioxide emissions per unit of electricity generated fell again, for the 5th year in a row, but only by 7%. On a more positive note, carbon dioxide emissions per unit of electricity generated are now less than half the level first published 11 years earlier.

UK Fuel Mix 2016/2017

The table below shows the UK Energy Fuel Mix Disclosure for the period 1 April 2016 to 31 March 2017.

Energy SourceUK Average
Source: BEIS
Coal8.5%
Natural gas44.1%
Nuclear21.0%
Renewables24.2%
Other fuels2.2%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
Coal925
Natural Gas359
Nuclear0
Renewables0
Other561
CO2 emissions - overall average249
High-level radioactive waste (g/kWh)0.007

Compared to the previous year electricity generation from coal, the dirtiest of the fossil fuels, fell by half, which is good. However, this was more than offset by electricity generation from gas (+37%) rather than renewables, which also fell by 11%. CO2 emission per kWh of energy produced fell overall by 15% as gas generation of electricity emits 60% less CO2 than does coal generation of electricity.

To compare energy suppliers and energy tariffs based on fuel mix, just pop your postcode into the box below. It takes just a few minutes to compare and apply.

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UK Fuel Mix 2015/2016

The table below shows the UK Fuel Mix Disclosure for the period 1 April 2015 to 31 March 2016.

Energy SourceUK Average
Source: BEIS
Coal17%
Natural gas32.3%
Nuclear23.7%
Renewables24.3%
Other fuels2.5%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
Coal910
Natural Gas390
Nuclear0
Renewables0
Other440
CO2 emissions - overall average292
High-level radioactive waste (g/kWh)0.007

Compared to the previous year electricity generation from coal fell by over a third to 17%. The biggest gainer was renewables which grew by 19% to take 24% of the electricity generation pie.

As a result, carbon dioxide emissions per kWh of electricity produced fell a further 20% year on year.

UK Fuel Mix 2014/2015

The table below shows the UK Fuel Mix Disclosure for the period 1 April 2014 to 31 March 2015.

Energy SourceUK Average
Source: BEIS
Coal26.7%
Natural gas29.7%
Nuclear22.2%
Renewables19.3%
Other fuels2.1%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
Coal910
Natural Gas380
Nuclear0
Renewables0
Other360
CO2 emissions - overall average363
High-level radioactive waste (g/kWh)0.007

Compared to the previous year electricity generation from coal fell by 21% to 26.7%. Coal was overtaken for the first time by gas fired generation which grew by 16% to 29.7%. Generation from renewables also grew by 16%  but remains in fourth place behind gas, coal and nuclear.

Carbon dioxide emissions per kWh of electricity produced fell 14% year on year.

UK Fuel Mix 2013/2014

The table below shows the UK Fuel Mix Disclosure for the period 1 April 2013 to 31 March 2014.

Energy SourceUK Average
Source: BEIS
Coal34%
Natural gas25.6%
Nuclear21.6%
Renewables16.7%
Other fuels2.1%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
Coal910
Natural Gas400
Nuclear0
Renewables0
Other420
CO2 emissions - overall average421
High-level radioactive waste (g/kWh)0.008

Compared to the previous year electricity generation from coal fell by 11% while gas fired generation fell 8%. The biggest gainer was renewables which grew 48%.

Despite this, carbon dioxide emissions per kWh of electricity produced fell only 10% year on year since renewables still only account for a sixth of overall electricity generation.

UK Fuel Mix 2012/2013

The table below shows the UK Fuel Mix Disclosure for the period 1 April 2012 to 31 March 2013.

Energy SourceUK Average
Source: BEIS
Coal38.4%
Natural gas27.7%
Nuclear20.6%
Renewables11.3%
Other fuels2.0%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
Coal910
Natural Gas390
Nuclear0
Renewables0
Other590
CO2 emissions - overall average469
High-level radioactive waste (g/kWh)0.009

Compared to the previous year electricity generation from coal shot up by 32% to take the largest share of the generation pie. Gas fell by an identical percentage into second position. Renewables grew by 23% but from a low base.

Consequently, carbon dioxide emissions per kWh of electricity produced increased by 8% to the highest level in 6 years. Not a year any self-respecting pro-environment government will want to remember.

Thinking of switching to a renewable energy supplier?

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UK Fuel Mix 2011/2012

The table below shows the UK Fuel Mix Disclosure for the period 1 April 2011 to 31 March 2012.

Energy SourceUK Average
Source: BEIS
Coal29.2%
Natural gas40.7%
Nuclear19.1%
Renewables9.2%
Other fuels1.8%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
Coal910
Natural Gas390
Nuclear0
Renewables0
Other540
CO2 emissions - overall average434
High-level radioactive waste (g/kWh)0.009

Renewables were again the biggest percentage gainer in the electricity generation mix (+16%) but from a low base. Gas generation share fell and was taken up by increases in renewables and nuclear. This led to a slight (4%) drop in carbon dioxide emissions per kWh of electricity produced.

UK Fuel Mix 2010/2011

The table below shows the UK Fuel Mix Disclosure for the period 1 April 2010 to 31 March 2011.

Energy SourceUK Average
Source: BEIS
Coal28.9%
Natural gas44.2%
Nuclear17.3%
Renewables7.9%
Other fuels1.7%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
Coal910
Natural Gas400
Nuclear0
Renewables0
Other620
CO2 emissions - overall average450
High-level radioactive waste (g/kWh)0.010

Compared to the previous year, coal was up, gas was down, nuclear was more or less flat and renewables were up 20% (but from a low base so only gained 1.3 percentage points of the fuel mix).

Consequently, another bad year for carbon dioxide emissions which increased by 9% per unit of electricity generated.

UK Fuel Mix 2009/2010

The table below shows the UK Fuel Mix Disclosure for the period 1 April 2009 to 31 March 2010.

Energy SourceUK Average
Source: BEIS
Coal25.8%
Natural gas47.7%
Nuclear18.0%
Renewables6.6%
Other fuels1.9%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
Coal870
Natural Gas370
Nuclear0
Renewables0
Other630
CO2 emissions - overall average413
High-level radioactive waste (g/kWh)0.010

Generation from coal fell 22% with the other fuels all increasing generation share to take up the slack, mainly nuclear.  Carbon dioxide emissions per unit of electricity generated fell 11% as a result.

UK Fuel Mix 2008/2009

The table below shows the UK Fuel Mix Disclosure for the period 1 April 2008 to 31 March 2009.

Energy SourceUK Average
Source: BEIS
Coal32.9%
Natural gas43.3%
Nuclear15.3%
Renewables5.9%
Other fuels2.5%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
Coal880
Natural Gas370
Nuclear0
Renewables0
Other530
CO2 emissions - overall average463
High-level radioactive waste (g/kWh)0.010

Trivial changes all around compared to the previous year. Carbon dioxide emissions per unit of electricity generated fell a pitiful 1%. Nothing to see. Move along.

Thinking of switching to a renewable energy supplier?

There are a growing number of energy suppliers offering 100% renewable electricity as standard on their tariffs. And many of those are some of the cheapest in the market. Finding a renewable energy deal and switching is very easy to do. Pop your postcode into the box below to compare tariffs and make your application. It takes just a few minutes.

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100% renewable electricity with very competitive tariffs. Has be worth checking out.

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UK Fuel Mix 2007/2008

The table below shows the UK Fuel Mix Disclosure for the period 1 April 2007 to 31 March 2008.

Energy SourceUK Average
Source: BEIS
Coal33.0%
Natural gas43.5%
Nuclear16.1%
Renewables5.5%
Other fuels1.9%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
Coal910
Natural Gas360
Nuclear0
Renewables0
Other610
CO2 emissions - overall average468
High-level radioactive waste (g/kWh)0.009

A shift away from and nuclear in favour of gas fired generation compared to the previous year. Renewables at 5.5% share still not in the picture despite 17% growth. Carbon dioxide emissions per unit of electricity generated fell a pitiful 1%.

UK Fuel Mix 2006/2007

The table below shows the UK Fuel Mix Disclosure for the period 1 April 2006 to 31 March 2007.

Energy SourceUK Average
Source: BEIS
Coal35.9%
Natural gas38.8%
Nuclear18.6%
Renewables4.7%
Other fuels2.1%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
Coal890
Natural Gas370
Nuclear0
Renewables0
Other580
CO2 emissions - overall average475

High-level radioactive waste (g/kWh)0.011

Small shifts away from coal and nuclear towards gas compared to the previous disclosure period. 2006/07 sees the first baseline publication of carbon dioxide and high-level radioactive waste emissions per unit of electricity generated. History will show that it took 11 years to reduce those carbon dioxide emissions by half.

UK Fuel Mix 2005/2006

The table below shows the UK Fuel Mix Disclosure for the period 1 April 2005 to 31 March 2006.

Energy SourceUK Average
Source: BEIS
Coal35.4%
Natural gas35.9%
Nuclear21.5%
Renewables4.3%
Other fuels2.9%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
CO2 emissions - overall averageNot published

High-level radioactive waste (g/kWh)Not published

The first comparative figures show a small switch around between coal generation (+6%) and natural gas generation (-8%) over the past year. Nuclear generation is flat with renewables still emerging from the primordial sludge.

UK Fuel Mix 2004/2005

The table below shows the UK Fuel Mix Disclosure for the period 1 April 2004 to 31 March 2005.

Energy SourceUK Average
Source: BEIS
Coal33.4%
Natural gas38.9%
Nuclear21.0%
Renewables3.9%
Other fuels2.8%
Environmental Impact
Energy SourceCarbon Dioxide Emmissions
g/kWh
CO2 emissions - overall averageNot published

High-level radioactive waste (g/kWh)Not published

This is the first set of UK Fuel Mix information published by DECC (the Department of Energy and Climate Change). Carbon dioxide and high-level radioactive waste levels were not published until 2006/07 which is why they are not shown here.

When reviewing subsequent years against these baseline numbers it is worth noting this. It took a full 10 years before the share of electricity generated from coal sustainably fell below the opening level. 10 years. Just saying.

Want to switch to a renewable energy supplier?

There are a growing number of energy suppliers offering 100% renewable electricity as standard on their tariffs. And many of those are some of the cheapest in the market. Finding a renewable energy deal and switching is very easy to do. Pop your postcode into the box below to compare tariffs and make your application. It takes just a few minutes.

100% renewable electricity with very competitive tariffs. Has be worth checking out.

Why pay more for the same energy?

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Energy supplier fuel mix disclosures

The figures above are aggregated data across al energy suppliers in Great Britain. The Fuel Mix Disclosure of individual energy suppliers will vary. To see how individual energy suppliers compare on fuel mix and carbon emissions, follow the links below.

  –  Bulb Energy Fuel Mix

  –  EDF Energy Fuel Mix

  –  Green Star Energy Fuel Mix 

  –  PFP Energy Fuel Mix

  –  Shell Energy Fuel Mix

  –  ScottishPower Fuel Mix