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Chart

Javascript is required to render chart Gas demand and supply source by month (GB).

Source: National Grid.

Information correct as of: April 2017

This chart shows monthly totals of gas supplies for the GB National Transmission System, broken down by the key different sources of supply. It also shows exports and storage injections.

Policy Areas:

  • Gas - wholesale markets

Data Table

Gas demand and supply source by month (GB)
Month beginningUKCSNorwayLNGIUKBBLStorageMoffatIUKStorage
01/10/20093.852.321.3400.230.12-0.51-0.6-0.32
01/11/20093.652.991.270.110.870.16-0.54-0.14-0.22
01/12/20094.083.351.670.481.050.87-0.630-0.21
01/01/20104.023.871.540.391.031.71-0.67-0.04-0.24
01/02/20103.683.551.330.130.881.19-0.59-0.07-0.13
01/03/20104.013.921.320.010.920.64-0.62-0.26-0.45
01/04/20103.772.791.7200.720.18-0.52-0.87-0.92
01/05/20103.822.811.5900.520.19-0.55-1.26-0.9
01/06/20103.053.050.9200.440.09-0.55-1.42-0.93
01/07/20103.22.090.9500.470.17-0.5-1.31-0.78
01/08/20102.951.841.3900.410.13-0.49-1.04-0.66
01/09/20103.111.421.4700.410.14-0.5-0.67-0.45
01/10/20103.542.911.6500.560.28-0.52-1.52-0.43
01/11/20103.463.261.790.090.890.71-0.62-0.34-0.34
01/12/20103.543.782.080.631.031.48-0.70-0.24
01/01/20113.593.072.430.310.960.81-0.65-0.01-0.36
01/02/20113.22.671.990.020.540.46-0.51-0.1-0.26
01/03/20113.42.852.460.040.210.37-0.57-0.12-0.69
01/04/20113.261.532.6800.490.14-0.52-1.24-1.07
01/05/20112.791.462.4800.50.18-0.5-1.12-0.77
01/06/20112.830.932.0200.370.09-0.48-0.88-0.61
01/07/20112.61.531.8600.360.06-0.5-1.02-0.7
01/08/20111.842.171.8100.310.21-0.51-1.34-0.35
01/09/20112.271.711.5800.390.06-0.47-0.67-0.43
01/10/201132.341.7300.370.14-0.49-1.39-0.25
01/11/20113.273.071.1400.520.19-0.48-1.05-0.23
01/12/20113.223.251.520.010.790.59-0.57-0.38-0.32
01/01/20123.023.641.10.020.860.86-0.56-0.18-0.3
01/02/20122.813.421.120.010.841.36-0.48-0.31-0.33
01/03/20123.162.981.0900.790.13-0.5-0.43-0.95
01/04/20122.562.161.6800.650.45-0.47-0.59-0.31
01/05/20122.382.281.340.010.480.24-0.49-0.53-0.72
01/06/20122.291.891.0200.280.11-0.45-0.35-0.86
01/07/20122.12.410.6500.320.12-0.43-0.96-0.72
01/08/20122.031.341.6300.190.1-0.46-1.09-0.61
01/09/20122.021.320.610.010.170.33-0.44-0.31-0.16
01/10/20122.52.880.370.310.560.2-0.5-0.18-0.52
01/11/20122.393.260.750.540.70.35-0.51-0.07-0.25
01/12/20122.353.781.120.420.920.81-0.53-0.13-0.45
01/01/20132.63.730.580.420.971.51-0.53-0.17-0.3
01/02/20132.283.390.350.510.941.81-0.49-0.06-0.26
01/03/20132.473.620.31.680.951.08-0.58-0.02-0.49
01/04/20132.53.231.120.150.650.34-0.51-0.3-0.93
01/05/20132.621.3400.490.33-0.49-0.5-0.99
01/06/20132.272.141.4400.270.14-0.44-0.62-1.34
01/07/20131.871.90.700.220.25-0.42-0.6-0.89
01/08/20131.651.630.50.020.270.21-0.44-0.19-0.83
01/09/20131.881.90.3600.240.26-0.42-0.24-0.36
01/10/20132.22.460.60.010.380.19-0.46-0.18-0.6
01/11/20132.293.20.970.260.910.33-0.52-0.02-0.22
01/12/20132.633.570.270.250.970.61-0.47-0.01-0.29
01/01/20142.73.530.240.191.10.9-0.52-0.02-0.15
01/02/20142.483.180.270.030.90.86-0.45-0.02-0.14
01/03/20142.622.820.420.070.950.54-0.49-0.05-0.48
01/04/20142.51.821.0600.630.22-0.41-0.49-0.69
01/05/20142.541.631.4300.340.29-0.51-0.79-0.72
01/06/20142.441.311.2400.370.18-0.49-0.49-0.97
01/07/20142.331.391.3500.220.19-0.45-0.84-0.6
01/08/20142.031.261.2800.190.2-0.46-0.51-0.38
01/09/20141.881.690.7600.430.19-0.47-0.65-0.24
01/10/20142.322.910.3300.390.31-0.45-0.5-0.46
01/11/20142.353.060.880.030.460.42-0.48-0.07-0.23
01/12/20142.463.640.910.040.740.75-0.5-0.04-0.22
01/01/20152.493.310.940.070.881.48-0.53-0.17-0.12
01/02/20152.153.390.760.10.661.47-0.5-0.05-0.16
01/03/20152.483.311.130.020.570.63-0.48-0.34-0.16
01/04/20152.642.280.8100.050.41-0.48-0.67-0.29
01/05/20152.791.941.3100.030.11-0.46-0.83-0.61
01/06/20152.491.670.8100.230.11-0.46-0.4-0.99
01/07/20152.182.140.8800.010.16-0.46-0.87-0.82
01/08/20152.222.281.25000.09-0.47-1.2-1.07
01/09/20152.242.271.0900.010.21-0.46-1.06-0.18
01/10/20152.5331.3900.010.18-0.52-0.86-0.56
01/11/20152.653.251.2800.30.32-0.46-0.76-0.29
01/12/20152.813.260.7600.60.27-0.46-0.52-0.27
01/01/20162.873.40.780.020.721.48-0.39-0.23-0.12
01/02/20162.443.21.20.030.611.19-0.41-0.13-0.15
01/03/20162.443.881.020.040.780.69-0.39-0.19-0.2
01/04/20162.453.170.420.001.040.48-0.35-0.47-0.13
01/05/20162.332.690.020.001.250.13-0.28-0.90-0.58
01/06/20161.992.570.030.030.400.15-0.24-0.04-0.84
01/07/20162.382.340.930.000.000.10-0.17-1.41-0.56
01/08/20161.802.160.610.000.010.29-0.23-0.88-0.27
01/09/20161.922.411.120.000.020.18-0.27-1.51-0.25
01/10/20162.403.880.370.000.180.21-0.24-0.45-0.27
01/11/20162.444.360.940.570.290.33-0.34-0.06-0.16
01/12/20162.604.600.470.820.260.50-0.290.00-0.4

More information

Gas demand and supply source: At-a-glance summary

In recent years gas demand has fallen across all consumers as boilers have become more efficient and demand for gas from power stations has fallen.

Around 75% of our gas comes from the UK continental shelf and Norway, with the remainder coming from continental Europe and global LNG. LNG supplies decreased in the first three quarters of 2016, while GB imports from continental Europe increased.

Relevance and further information

The gas supply mix is a useful indicator of the diversity and origin of the gas supplied in GB. Having diverse sources of supply suggests greater resilience for GB gas supply.

Methodology

Positive values represent supplies to the GB system. This includes domestic production from UKCS, imports at LNG terminals, withdrawals from storage and imports via pipelines and interconnectors.

Negative values represent supplies from the GB system (excluding end-consumer demand). This includes injections to storage and exports via interconnectors. GB has three interconnectors linking us with Belgium (IUK), the Netherlands (BBL) and Ireland and Northern Ireland (Moffat).

For simplicity, we have assumed gas entering at the St. Fergus terminal to be from the UKCS for the Mobil subterminal, and from Norway for the Shell and Total subterminals. This is likely to marginally overstate gas flows from Norway.

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Chart

Javascript is required to render chart Average switching time for domestic customers (GB) .

Source: Ofgem analysis of electricity distribution network operator (DNO) and Xoserve (gas) data.

Information correct as of: December 2016

This chart shows a month-on-month view of the average time it takes for a domestic customer to switch supplier which is sourced from the network operator data.

Under the more information tab you can find additional data on the percentage of switches in Q4 2016 that suppliers completed in the time limit they are obligated to meet.

Policy Areas:

  • Electricity - retail markets
  • Gas - retail markets

Data Table

Average switching time for domestic customers (GB)
MonthAverage electricity switching timeAverage gas switching time
01/01/201424
01/02/201423
01/03/20141822
01/04/20141823
01/05/20141823
01/06/20141824
01/07/20141722
01/08/20141822
01/09/20141822
01/10/20141822
01/11/20141821
01/12/20141620
01/01/20151620
01/02/20151516
01/03/20151615
01/04/20151616
01/05/20151516
01/06/20151616
01/07/20151616
01/08/20151616
01/09/20151618
01/10/20151517
01/11/20151517
01/12/20151618
01/01/20161618
01/02/20161618
01/03/20161617
01/04/20161617
01/05/20161617
01/06/20161617
01/07/20161617
01/08/20161617
01/09/20161616
01/10/20161516
01/11/20161616
01/12/20161517

More information

At-a-glance summary

Between January 2014 and December 2016, the average switching time for gas has fallen by 8 days to 17 days, although it was at 16 days for the three preceding months. There was a slight peak in late 2015 and early 2016. This follows changes to gas industry rules in November 2013. The average switching time for electricity has remained around 16 days since end-2014.

The average switching time for electricity has been flat since the end of 2014 at around 16 days, with a slight decrease in the winter months.

Relevance and further information

The average switching time is a useful indicator of how long a switch takes to complete. This affects a customer’s incentive and ability to take advantage of the best offers available in the market.

Methodology

Supply licences require licensees to take all reasonable steps to complete a transfer 21 days after the end of the 14 day cooling-off period (or after an earlier date during the cooling-off if agreed with the customer).

Switching time is measured here by the number of calendar days it takes from when a supplier submits a switching request to the transfer taking place. We source our data from distribution network operators, so our analysis does not reflect the time taken by the supplier to submit a switching request, which may happen at the end or during the cooling-off period, nor the additional time to process the contract with the customer.

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Chart

Source: Six large suppliers.

Information correct as of: December 2016

This chart shows the proportion of monthly internal switches for domestic gas and electricity customer accounts for the six large suppliers. As a benchmark, the chart also shows monthly external switching rates (ie to another supplier) for the whole market.

Policy Areas:

  • Electricity - retail markets
  • Gas - retail markets

Data Table

Large suppliers: Internal and external switching rate by fuel type (GB)
Electricity total internal switching rateGas total internal switching rateElectricity total external switching rateGas total external switching rateElectricity internal switching rate by tariffGas internal switching rate by tariff
Nov-145.03%5.70%0.89%1.03%2.34%2.77%
Dec-144.21%4.75%1.13%1.19%1.86%2.14%
Jan-154.78%5.61%0.69%0.74%2.91%3.54%
Feb-155.22%5.96%0.94%1.10%2.89%3.34%
Mar-155.26%5.94%1.38%1.45%3.40%3.93%
Apr-155.41%6.21%0.99%1.02%2.70%3.15%
May-153.84%4.26%0.97%0.94%1.69%1.89%
Jun-153.14%3.38%0.83%0.83%1.61%1.75%
Jul-153.34%3.64%0.86%0.91%1.82%2.01%
Aug-153.95%4.29%0.91%0.93%1.76%1.89%
Sep-153.50%3.80%1.01%1.06%1.98%2.19%
Oct-153.78%4.15%1.26%1.31%2.02%2.24%
Nov-153.92%4.25%1.24%1.30%2.10%2.31%
Dec-153.31%3.55%1.11%1.15%1.67%1.76%
Jan-164.78%5.39%0.88%0.90%3.00%3.46%
Feb-165.00%5.54%1.40%1.45%3.15%3.53%
Mar-164.88%5.40%1.63%1.72%2.72%3.08%
Apr-164.40%4.80%1.38%1.30%2.28%2.56%
May-163.82%4.23%1.24%1.24%2.12%2.37%
Jun-164.43%4.82%1.20%1.20%2.28%2.48%
Jul-164.26%4.59%1.09%1.05%1.95%2.07%
Aug-162.82%2.98%1.11%0.99%1.55%1.65%
Sep-163.90%6.26%1.25%1.29%1.99%2.09%
Oct-165.10%5.48%1.74%1.82%2.12%2.23%
Nov-164.45%4.85%1.38%1.41%2.05%2.25%
Dec-163.14%3.41%1.51%1.51%1.33%1.47%

More information

At-a-glance summary

Between November 2014 and April 2015, the monthly internal switching rate for the six large suppliers grew and peaked. Since April 2015 the switching rate has fluctuated but generally decreased. It shows a seasonal pattern similar to external switching.

Throughout the period up to December 2016, both internal total and internal tariff switching rates have been significantly higher than the external switching rate for the whole domestic segment.

Relevance and further information

Together, internal and external switching rates provide a more comprehensive indicator of how engaged consumers are in the domestic retail energy market.

Methodology 

Internal total switching refers to a customer changing tariff, payment method or account management (online/offline) with their existing supplier. 

Internal tariff switching only includes tariff changes that, as a minimum, represent ‘active choices’. For example, the observed switch from a ‘dead’ tariff or an existing fixed tariff to a default standard variable tariff may not reflect an active choice.

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Chart

Source: Ofgem analysis of data from electricity distribution network operators (DNOs), Xoserve and the six large suppliers before 2014.

Information correct as of: February 2016

This chart shows the total number of domestic customers switching gas and electricity supplier each month. It also shows, in dotted lines, the number of switches going to medium/small suppliers, as well as the net gains made by these suppliers (from November 2016).

Policy Areas:

  • Electricity - retail markets
  • Gas - retail markets

Data Table

Number of domestic customers switching supplier by fuel type (GB)
MonthTotal electricity switchesTotal gas switchesSwitches to small and medium sized electricity suppliersSwitches to small and medium sized gas suppliersNet gains for small and medium sized electricity suppliersNet gains for small and medium sized gas suppliers
01/01/2003326,000266,000
01/02/2003337,000167,000
01/03/2003368,000239,000
01/04/2003351,000216,000
01/05/2003327,000245,000
01/06/2003344,000252,000
01/07/2003365,000260,000
01/08/2003318,000253,000
01/09/2003382,000296,000
01/10/2003370,000290,000
01/11/2003344,000280,000
01/12/2003371,000294,000
01/01/2004273,000303,000
01/02/2004341,000256,000
01/03/2004412,000334,000
01/04/2004341,000283,000
01/05/2004310,000266,000
01/06/2004356,000297,000
01/07/2004323,000275,000
01/08/2004331,000261,000
01/09/2004367,000276,000
01/10/2004406,000338,000
01/11/2004398,000370,000
01/12/2004340,000330,000
01/01/2005243,000281,000
01/02/2005359,000181,000
01/03/2005390,000302,000
01/04/2005384,000341,000
01/05/2005369,000304,000
01/06/2005365,000317,000
01/07/2005330,000271,000
01/08/2005375,000286,000
01/09/2005348,000298,000
01/10/2005416,000301,000
01/11/2005465,000329,000
01/12/2005361,000300,000
01/01/2006284,000290,000
01/02/2006347,000208,000
01/03/2006539,000366,000
01/04/2006418,000345,000
01/05/2006396,000372,000
01/06/2006364,000350,000
01/07/2006360,000295,000
01/08/2006428,000315,000
01/09/2006402,000358,000
01/10/2006429,000356,000
01/11/2006482,000374,000
01/12/2006392,000288,000
01/01/2007352,000346,000
01/02/2007390,000265,000
01/03/2007441,000333,000
01/04/2007392,000301,000
01/05/2007452,000334,000
01/06/2007426,000378,000
01/07/2007441,000352,000
01/08/2007501,000336,000
01/09/2007397,000289,000
01/10/2007477,000383,000
01/11/2007477,000343,000
01/12/2007411,000322,000
01/01/2008335,000344,000
01/02/2008441,000278,000
01/03/2008476,000313,000
01/04/2008438,000388,000
01/05/2008440,000335,000
01/06/2008459,000347,000
01/07/2008474,000361,000
01/08/2008553,000348,000
01/09/2008466,000427,000
01/10/2008478,000347,000
01/11/2008428,000336,000
01/12/2008439,000332,000
01/01/2009290,000331,000
01/02/2009364,000255,000
01/03/2009475,000311,000
01/04/2009423,000298,000
01/05/2009397,000324,000
01/06/2009434,000332,000
01/07/2009442,000327,000
01/08/2009388,000304,000
01/09/2009480,000343,000
01/10/2009455,000336,000
01/11/2009441,000330,000
01/12/2009438,000332,000
01/01/2010259,000307,0006622
01/02/2010353,000217,0008884
01/03/2010460,000316,0007735
01/04/2010379,000307,0009193
01/05/2010352,000271,0007564
01/06/2010413,000289,0002986
01/07/2010398,000292,0003007
01/08/2010419,000296,0003928
01/09/2010426,000305,0006836
01/10/2010409,000305,0004253
01/11/2010456,000322,00010827
01/12/2010425,000328,00011251
01/01/2011270,000279,0003280
01/02/2011324,000211,0006340
01/03/2011400,000307,0006597
01/04/2011360,000246,0004273
01/05/2011356,000308,0007479
01/06/2011393,000259,0008895
01/07/2011397,000301,0008868
01/08/2011449,000343,00016021
01/09/2011343,000309,00013281
01/10/2011326,000247,00019478
01/11/2011329,000240,00019854
01/12/2011259,000219,00012620
01/01/2012210,000194,00022337
01/02/2012257,000149,00029128
01/03/2012279,000190,00020817
01/04/2012232,000176,00012872
01/05/2012286,000202,00019167
01/06/2012272,000192,00041228
01/07/2012257,000190,00018762
01/08/2012265,000187,00013366
01/09/2012312,000195,00022,561
01/10/2012366,000273,00072,968
01/11/2012338,000174,00066,652
01/12/2012266,000159,00050,393
01/01/2013228,000157,92943,231
01/02/2013247,000117,96449,082
01/03/2013247,000144,21329,156
01/04/2013251,000186,69029,311
01/05/2013234,000155,03124,985
01/06/2013218,000148,45335,281
01/07/2013232,000160,79331,292
01/08/2013210,000140,74932,638
01/09/2013254,000145,41427,969
01/10/2013381,186213,58971,447
01/11/2013606,061358,799138,394
01/12/2013309,978260,32593,626
01/01/2014214,944188,87093,57973,618
01/02/2014253,295169,946106,70877,109
01/03/2014269,497195,773134,80292,080
01/04/2014252,047201,512133,319104,617
01/05/2014228,628179,604124,802100,417
01/06/2014201,381163,56898,58687,363
01/07/2014219,026145,714104,62573,414
01/08/2014223,581150,623113,96076,153
01/09/2014283,877180,965138,186102,117
01/10/2014309,890232,178118,527108,942
01/11/2014270,603216,783108,79388,088
01/12/2014311,298250,638103,86781,917
01/01/2015190,554155,78973,97758,597
01/02/2015291,341230,518102,44590,566
01/03/2015382,809304,679135,965103,196
01/04/2015272,996214,556108,97679,892
01/05/2015239,574197,166108,49988,984
01/06/2015229,825174,688105,81483,896
01/07/2015239,343192,299108,28786,631
01/08/2015253,099195,183116,63393,783
01/09/2015279,411223,703128,043100,534
01/10/2015349,278274,581161,602121,335
01/11/2015343,870274,206161,034131,736
01/12/2015310,293242,630148,668117,677
01/01/2016245,922189,143139,539109,708
01/02/2016390,645305,057176,036143,238
01/03/2016453,964361,399244,232196,273
01/04/2016386,456273,751204,748151,645
01/05/2016345,146261,324169,711127,352
01/06/2016335,879252,712143,231104,674
01/07/2016303,404221,175140,898103,662
01/08/2016310,132209,178149,026108,997
01/09/2016349,203271,374154,142116,032
01/10/2016486,878384,023150,747118,328
01/11/2016386,585297,468147,607116,24530,82623,642
01/12/2016423,068317,74089,19868,891
01/01/2017319,503239,75997,55978,269
01/02/2017398,150296,055107,05585,037

More information

At-a-glance summary

The number of domestic gas and electricity customers switching supplier generally follows a seasonal pattern (with peaks around March and November then dipping in January and the summer months). Switching declined significantly from 2008 to 2012, then levelled out. It has been on the rise since 2014 and the total number of domestic switches in the year up to the end of February 2017 has been 25% higher than in the 12 preceding months.

In February, the net switching gains for small and medium suppliers stood at around 107,000 and 85,000 meter points for electricity and gas respectively. This continues the trend of increasing switches  to smaller suppliers in Q4 2016.

Relevance and further information

External switching, from one supplier to another, is one measure of consumer engagement with the market. The number of switches to small and medium sized suppliers show how these suppliers are attracting customers over time.

Methodology

The number of customers switching supplier shown in the graph is based on the number of meter points a supplier gains from another following a customer choice to change their supplier.

The net gains for small and medium suppliers is calculated by subtracting from the gross meter point gains these suppliers achieve over the month the gross number of meter points these suppliers lose over the same period.

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Chart

Source: Energylinx.

Information correct as of: March 2017

This chart compares the cheapest available tariffs offered by the six large suppliers with the cheapest tariff available in the market by payment method (direct debit, standard credit and prepayment). Figures are based on a typical domestic dual fuel customer.

Policy Areas:

  • Electricity - retail markets
  • Gas - retail markets

Data Table

Cheapest tariffs by payment method: Typical domestic dual fuel customer (GB)
DateLarge six suppliers (direct debit)Large six suppliers (standard credit)Large six suppliers (prepayment)Market (direct debit)Market (standard credit)Market (prepayment)
28/01/2012915.27976.71021.54906.56971.04969.61
28/02/2012886.18976.71021.54878.1971.04969.61
28/03/2012886.18976.71021.54878.1971.04969.61
28/04/2012895.69953.41021.54878.1953.4969.24
28/05/2012895.69953.41021.54878.1890.12969.24
28/06/2012895.69953.41021.54895.69953.41017.42
28/07/2012895.69953.41021.54875.93953.41017.42
28/08/2012899.1957.031021.54875.93957.031017.42
28/09/2012901.471020.711021.54875.93988.141017.42
28/10/2012906.171020.711069.39893.85988.141019.3
28/11/2012958.211020.711069.39909.59979.351045.64
28/12/2012990.71071.381133.19909.59979.351045.64
28/01/2013957.181037.21133.19909.59979.351045.64
28/02/2013957.181037.21133.19909.591037.21045.64
28/03/2013966.541046.571133.19909.591046.571045.64
28/04/2013966.541046.571133.19909.591046.571045.64
28/05/2013966.541046.571133.19962.43996.91045.64
28/06/2013966.541046.571133.19769.95996.91045.64
28/07/2013984.681075.511133.19769.95996.91045.64
28/08/2013971.771051.791133.19769.951051.791045.64
28/09/2013971.771051.791133.19769.951051.791045.64
28/10/20131011.81079.911133.19769.951070.991093.35
28/11/2013993.41058.151150.97769.951058.151093.35
28/12/20131033.471101.651178.61769.951101.651093.35
28/01/20141033.471101.651178.61975.211101.651172.77
28/02/20141033.971108.11178.61966.341108.11172.77
28/03/20141024.791117.271178.61964.311117.271171.39
28/04/20141000.381069.951178.61946.421069.951171.39
28/05/20141000.381069.951178.61944.551069.951171.39
28/06/20141000.381069.951170.86944.551069.951162.4
28/07/20141000.381069.951170.86944.951029.051162.4
28/08/20141000.381069.951170.86943.431038.881154.43
28/09/2014960.91030.951170.86942.271030.951154.43
28/10/2014953.41046.451170.86931.021024.451154.43
28/11/2014921.881003.791170.86914.511003.791154.43
28/12/2014916.211003.791170.86906.141003.791151.22
28/01/2015875.4945.461148.99871.26945.461148.99
28/02/2015839.28955.071148.90839.28950.351148.90
28/03/2015836.99907.241148.99836.99907.241116.99
28/04/2015834.57977.561141.64834.57950.631116.99
28/05/2015835.19905.441141.64830.56905.441116.99
28/06/2015835.71981.781122.97830.56940.901116.99
28/07/2015863.85981.781122.97830.56939.851116.99
28/08/2015876.03977.321128.54830.56940.271116.99
28/09/2015876.03963.771128.54830.56907.261100.94
28/10/2015803.00873.251128.54793.93844.041100.94
28/11/2015805.40950.751128.54787.05844.041055.61
28/12/2015850.52950.751102.20787.05844.041055.61
28/01/2016769.69839.941102.20765.00839.941055.61
28/02/2016738.38808.631092.26738.38808.631054.20
28/03/2016727.70797.761070.37727.70797.761051.22
28/04/2016723.93793.481070.37723.91793.481030.27
28/05/2016723.23877.121037.31723.23877.121017.61
28/06/2016723.23847.451037.31723.23847.45985.97
28/07/2016779.39904.971037.31758.31871.54985.97
28/08/2016801.37941.421043.54769.65871.54985.97
28/09/2016754.64839.151043.54744.30839.15985.97
28/10/2016803.54967.131043.54741.92829.42985.97
28/11/2016897.181002.631035.64790.02907.75985.97
28/12/2016951.511031.571035.64790.02923.48985.97
28/01/2017951.511031.571035.64833.71951.58985.97
28/02/2017938.011007.571032.36833.71943.99985.97
28/03/2017936.811031.321035.64833.71964.36985.97

More information

At-a-glance summary

Direct debit customers are offered the cheapest tariffs, followed by standard credit customers and then those using prepayment meters. The gap between the cheapest tariff on standard credit and direct debit was relatively stable over 2015 and 2016 at around £100, although it has consistently been at around £120 since November 2016.

The gap between the cheapest prepayment and direct debit tariff peaked at around £320 in March 2016. It fell to around £150 in January 2017 and has remained at this level until March 2017. This was due to large movements in the price of the cheapest direct debit tariff, as well as a fall in the price of the cheapest prepayment tariff.

Please note that the prepayment tariff price cap came into effect on 1 April, after the prices shown here.

Relevance and further information

This indicator helps us understand pricing by payment methods, as well as how much other suppliers are able to compete with the six large suppliers for each method.

Methodology

We calculate the bill values associated with the different payment methods using a ‘typical medium domestic consumer’. As of September 2015, typical domestic consumption values for a medium consumer are 12,500kWh/year for gas and 3,100kWh/year for electricity (profile class 1). The chart includes collective switching tariffs from Q1 2016.

All tariffs shown in the chart are for a dual fuel customer. Dual fuel refers to a situation where a customer takes gas and electricity from the same supplier.

Tariffs with limited availability depending on customer features (for example, tariffs which are only available to new customers, also known as ‘acquisition’ tariffs, or tariffs restricted to certain regions) are excluded from the calculation to make sure that all tariffs considered are generally available to all customers across GB.

Tariffs available with white label suppliers are included in the calculation of the cheapest tariff. White label suppliers are organisations without supply licenses that partner with an active licensed supplier to offer gas and electricity using their own brand.

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Chart

Source: Energylinx.

Information correct as of: March 2017

This chart shows trends in domestic energy bills by tariff offered by the six large suppliers and other suppliers. It compares their average standard variable tariffs with the cheapest tariffs available in the market (including white label tariffs). Figures are based on a typical domestic dual fuel customer paying by direct debit. 

This information should not be used as a price comparison tool. To find out about accredited price comparison sites, see our impartial guide at Be An Energy Shopper.

Policy Areas:

  • Electricity - retail markets
  • Gas - retail markets

Data Table

Retail price comparison by company and tariff type: Domestic (GB)
DateAverage standard variable tariff (Six large suppliers)Average standard variable tariff (Other suppliers)Cheapest tariff (Six large suppliers)Cheapest tariff (All suppliers)Cheapest tariff (Basket)
28/01/20121020.161026.33915.27906.56947.56
28/02/20121000.761019.41886.18878.10930.29
28/03/2012997.251019.41886.18878.10936.54
28/04/2012997.251019.35895.69878.10937.68
28/05/2012997.251019.35895.69878.10929.78
28/06/2012997.251036.16895.69895.69945.53
28/07/2012997.251034.16895.69875.93928.99
28/08/2012997.251032.02899.10875.93924.85
28/09/2012997.251019.84901.47875.93931.04
28/10/20121009.001022.51906.17893.85956.00
28/11/20121030.781046.91958.21909.59997.71
28/12/20121061.801089.65990.70909.59994.59
28/01/20131074.421089.65957.18909.59990.81
28/02/20131074.421103.04957.18909.59994.56
28/03/20131074.421103.04966.54909.59995.50
28/04/20131074.421115.23966.54909.59988.37
28/05/20131074.431115.23966.54962.43997.77
28/06/20131074.431115.23966.54769.95967.26
28/07/20131074.451115.23984.68769.95974.82
28/08/20131074.451115.23971.77769.95988.47
28/09/20131074.451115.23971.77769.95979.55
28/10/20131074.451129.021011.80769.95995.67
28/11/20131105.941133.08993.40769.95992.26
28/12/20131138.951133.081033.47769.95997.00
28/01/20141145.841134.251033.47975.211013.73
28/02/20141134.091139.371033.97966.341014.19
28/03/20141128.101136.041024.79964.311016.25
28/04/20141128.101139.051000.38946.42995.26
28/05/20141128.101139.051000.38944.55995.13
28/06/20141128.101139.051000.38944.55992.88
28/07/20141128.101142.671000.38944.95976.39
28/08/20141128.101140.961000.38943.43978.98
28/09/20141128.101171.97960.90942.27972.34
28/10/20141128.101145.38953.40931.02960.15
28/11/20141128.101145.38921.88914.51947.94
28/12/20141128.101144.09916.21906.14929.69
28/01/20151124.331144.09875.40871.26895.39
28/02/20151106.651110.84839.28839.28881.39
28/03/20151106.651088.31836.99836.99892.38
28/04/20151106.651075.32834.57834.57878.56
28/05/20151102.281073.26835.19830.56877.12
28/06/20151102.281073.26835.71830.56871.21
28/07/20151102.281066.77863.85830.56867.88
28/08/20151098.031066.77876.03830.56868.79
28/09/20151098.031054.98876.03830.56858.62
28/10/20151098.031050.12803.00793.93823.00
28/11/20151098.031040.70805.40787.05810.84
28/12/20151098.031039.03850.52787.05803.86
28/01/20161098.031035.48769.69765.00785.04
28/02/20161092.691020.06738.38738.38755.65
28/03/20161071.441013.00727.70727.70756.05
28/04/20161065.97978.55723.91723.91751.58
28/05/20161065.97976.04723.23723.23742.71
28/06/20161065.97984.02723.23723.23751.36
28/07/20161065.97988.70779.39758.31779.72
28/08/20161065.97983.86801.37769.65789.25
28/09/20161065.97983.89754.64744.30777.00
28/10/20161065.97994.93803.54741.92786.41
28/11/20161065.971012.84897.18790.02859.23
28/12/20161065.971019.72951.51790.02872.16
28/01/20171061.061020.10951.51833.71881.11
28/02/20171061.061034.48938.01833.71876.52
28/03/20171086.311038.66936.81833.71875.30

More information

At-a-glance summary

From the start of 2014 until early 2016, the price difference between the average standard variable tariff and the cheapest tariff available in the market increased significantly. This is because the price of the cheapest tariffs fell at a much faster rate than that of the average standard variable tariff. The differential peaked in February 2016 at £350. Since then, the cheapest tariff in the market and that offered by the six large suppliers have increased by around 13% and 27% respectively, driven primarily by increases in wholesale prices. The differential reached a two-year low of £230 in February 2017, but has since increased to over £250.

The average price of SVTs offered by the six large suppliers increased in March to £1,086. This is the first increase in SVT price for these suppliers since the end of 2013. 

The differential between the basket of cheapest tariffs and the average standard variable tariff for the six large suppliers stood at £211 in March, an increase of 11% over the previous month.

Please note that the SVT price increases announced by the majority of the large suppliers only started to come into effect on 1 March, with more increases happening in April. As such, the full impact of these increases is not captured in the chart.

Relevance and further information

Tariff differentials reflect pricing in different market segments, as well as how much other suppliers are able to compete on price with the six large suppliers.

Methodology

We calculate the bill values associated with the different tariff types using a ‘typical medium domestic consumer’. As of September 2015, typical consumption values for a medium consumer are 12,500kWh/year for gas and 3,100kWh/year for electricity (profile class 1). The chart includes collective switching tariffs from Q1 2016. All tariffs shown in the chart are for a dual fuel, direct debit customer.

Dual fuel refers to a situation where a customer takes gas and electricity from the same supplier.

A standard variable tariff refers to a supply contract which is for a period of an indefinite length and which does not contain a fixed term period that applies to any of the terms and conditions. It’s an energy supplier’s basic offer. If a customer does not choose a specific energy plan, for example after their fixed tariff ends, they will be moved on a standard variable tariff until they have chosen a new one. A customer can also make an active choice to select a standard variable tariff.

Tariffs with limited availability depending on customer features (for example, tariffs which are only available to new customers, also known as ‘acquisition’ tariffs, or tariffs restricted to certain regions) are excluded from the calculation to make sure that all tariffs considered are generally available to all customers across GB.

Tariffs available with white label suppliers are included in the calculation of the cheapest tariffs. White label suppliers are organisations without supply licenses that partner with an active licensed supplier to offer gas and electricity using their own brand.

To calculate the average of the cheapest tariffs from the ten cheapest suppliers we took the cheapest tariff offered by each supplier in the market (i.e. one tariff per supplier) and then ranked the tariffs in order of price. We then took the simple average of the ten cheapest tariffs in this list. This method is to ensure a cross section of suppliers is included in the calculation.

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Chart

Javascript is required to render chart Electricity supply market shares by company: Domestic (GB) .

Source: Ofgem analysis of electricity distribution network operator reports .

Information correct as of: December 2016

This chart shows the domestic electricity market shares for each of the six large suppliers, six medium sized suppliers and other suppliers (presented in aggregate as ‘others’).

Chart tip: To look at a specific data series or to switch a series view on and off, click on a title in the chart legend (e.g. British Gas).

Policy Areas:

  • Electricity - retail markets

Data Table

Electricity supply market shares by company: Domestic (GB)
British GasEDFE.ONRWE npowerScottish PowerSSECo-operative EnergyExtra EnergyFirst UtilityOVOUtilitaUtility WarehouseOthers
Q1 200424%14%21%15%11%14%1%
Q2 200424%14%21%15%12%15%0%
Q3 200424%14%21%15%12%15%0%
Q4 200423%13%21%15%13%15%0%
Q1 200522%13%21%15%13%15%0%
Q2 200522%13%21%15%13%16%1%
Q3 200522%13%20%15%13%16%1%
Q4 200522%13%20%15%13%16%1%
Q1 200622%13%20%15%13%16%0%
Q2 200622%14%20%15%13%16%0%
Q3 200622%14%20%15%12%17%0%
Q4 200622%14%19%16%12%17%0%
Q1 200722%14%19%16%12%18%0%
Q2 200722%14%19%16%12%18%0%
Q3 200722%13%18%16%12%18%0%
Q4 200722%13%18%15%12%18%0%
Q1 200822%13%18%15%12%19%0%
Q2 200822%13%18%15%12%19%0%
Q3 200822%13%18%15%12%19%0%
Q4 200822%13%18%15%12%19%0%
Q1 200922%13%18%15%12%20%0%
Q2 200923%13%18%15%12%20%0%
Q3 200923%13%18%15%12%20%0%
Q4 200923%13%18%14%12%20%0%
Q1 201024%13%17%14%12%20%1%
Q2 201024%13%17%14%12%20%1%
Q3 201024%13%17%14%12%20%1%
Q4 201025%13%17%14%11%20%1%
Q1 201125%13%17%14%11%20%1%
Q2 201125%13%17%14%11%20%1%
Q3 201125%13%17%14%11%19%1%
Q4 201125%13%17%14%11%19%1%
Q1 201225%13%17%14%11%19%1%
Q2 201225%13%17%14%11%19%1%
Q3 201225%13%17%14%11%19%1%
Q4 201225%13%17%14%12%18%0%0%1%0%0%0%0%
Q1 201325%13%17%13%12%18%0%0%1%1%0%0%1%
Q2 201325%13%17%13%12%18%0%0%1%1%0%0%1%
Q3 201325%13%16%13%12%18%0%0%1%0%0%0%1%
Q4 201324%13%16%12%12%18%1%0%1%0%0%1%1%
Q1 201424%13%16%12%12%17%1%0%1%1%0%2%1%
Q2 201424%13%16%12%11%17%1%0%2%1%0%2%1%
Q3 201424%13%16%11%11%17%1%0%2%1%0%2%1%
Q4 201424%13%16%11%11%17%1%0%3%1%1%2%2%
Q1 201524%13%16%11%11%16%1%1%3%2%1%2%2%
Q2 201524%12%16%11%11%16%1%1%3%2%1%2%2%
Q3 201524%12%16%11%11%16%1%1%3%2%1%2%2%
Q4 201523%12%15%10%11%16%1%1%3%2%1%2%3%
Q1 201623%12%15%10%11%15%1%1%3%2%1%2%3%
Q2 201623%12%15%10%11%15%1%1%3%2%1%2%4%
Q3 201623%12%14%10%11%15%1%1%3%2%1%2%4%
Q4 201623%12%14%10%11%15%1%1%3%2%2%2%4%

More information

At-a-glance summary

Between 2004 and Q4 2016, the combined market share for five of the large electricity suppliers (excluding British Gas) in the GB domestic market declined by fourteen percentage points, from 75% to 61%. Individual market shares fluctuated between 10% and 21%. 

In the same period, British Gas was the leading domestic electricity supplier in GB, with a market share ranging between 22% and 25%. 

Until 2012, other suppliers held a market share of below 2%. Since then, they have grown significantly and reached a 15% market share in Q4 2016. Six of these (Utility Warehouse, OVO, First Utility, Utilita, Extra Energy and Cooperative Energy) have increased their individual market shares above 1%, with First Utility reaching over 3%. In November 2016, Cooperative Energy acquired all the customers of GB Energy Supply. As a result, their market share increased by around 0.5 percentage points relative to Q3 2016. 

Relevance and further information

The evolution of market shares is a useful measure of trends in market concentration. They help us understand the impact between market shares and competitive dynamics, both for the six large suppliers and other suppliers, and which companies are winning or losing customers.

Methodology

We calculate market shares from the number of meter points on the electricity distribution networks, as provided to us by electricity distribution network operators.

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Chart

Javascript is required to render chart Gas supply market shares by company: Domestic (GB).

Source: Ofgem analysis of gas distribution network reports from Xoserve.

Information correct as of: December 2016

This chart shows the domestic gas market shares for each of the six large suppliers, six medium sized suppliers and other suppliers (presented in aggregate as ‘others’).

Chart tip: To look at a specific data series or to switch a series view on and off, click on a title in the chart legend (e.g. British Gas).

Policy Areas:

  • Gas - retail markets

Data Table

Gas supply market shares by company: Domestic (GB)
British GasEDFE.ONRWE npowerScottishPowerSSEUtility Warehouse OVOFirst UtilityUtilitaExtra EnergyCo-operative EnergyOthers
2005 Q255%5%12%10%9%9%0%
2005 Q355%5%12%10%9%10%0%
2005 Q454%5%12%10%9%10%0%
2006 Q154%5%12%10%9%10%0%
2006 Q252%6%12%11%9%11%0%
2006 Q351%6%12%11%8%11%0%
2006 Q450%6%12%12%8%12%0%
2007 Q148%7%12%12%9%13%0%
2007 Q248%7%12%12%8%13%0%
2007 Q348%7%12%12%8%14%0%
2007 Q447%7%11%12%8%14%0%
2008 Q147%7%12%12%8%14%0%
2008 Q246%7%12%12%8%15%0%
2008 Q345%7%12%12%9%15%0%
2008 Q445%7%12%12%9%16%0%
2009 Q144%7%12%12%9%16%0%
2009 Q244%7%12%12%9%16%0%
2009 Q344%7%12%12%8%16%0%
2009 Q444%7%12%12%8%16%0%
2010 Q144%7%12%12%8%16%0%
2010 Q244%7%12%12%8%16%0%
2010 Q344%7%12%11%8%16%0%
2010 Q443%7%12%11%9%16%0%
2011 Q143%8%13%11%9%16%0%
2011 Q243%7%13%11%9%16%1%
2011 Q343%8%13%12%8%16%1%
2011 Q442%8%13%12%8%16%1%
2012 Q142%8%13%12%8%16%0%0%0%0%0%0%0%
2012 Q242%8%13%12%8%16%0%0%0%0%0%0%0%
2012 Q341%9%13%12%9%15%0%0%0%0%0%0%0%
2012 Q441%9%13%12%9%15%0%0%1%0%0%0%0%
2013 Q141%8%13%12%9%15%0%0%1%0%0%0%0%
2013 Q241%9%13%11%9%15%0%0%1%0%0%0%0%
2013 Q340%9%13%11%9%15%0%0%1%0%0%1%1%
2013 Q439%9%13%10%9%15%2%0%1%0%0%1%1%
2014 Q139%9%12%10%9%14%2%1%2%0%0%1%1%
2014 Q238%9%12%10%9%14%2%1%2%0%0%1%1%
2014 Q338%9%12%10%9%14%2%1%2%1%0%1%1%
2014 Q438%9%12%9%9%14%2%1%3%1%0%1%1%
2015 Q138%9%12%9%9%13%2%2%3%1%1%1%1%
2015 Q237%9%12%9%9%13%2%2%3%1%1%1%2%
2015 Q337%8%12%9%9%13%2%2%3%1%1%1%2%
2015 Q437%8%12%9%9%13%2%2%4%1%1%1%2%
2016 Q136%8%11%9%9%13%2%2%4%1%1%1%3%
2016 Q236%8%11%9%9%12%2%3%4%2%1%1%4%
2016 Q335%8%11%9%9%12%2%3%4%2%1%1%4%
2016 Q435%8%10%9%9%12%2%3%4%2%1%1%4%

More information

At-a-glance summary

Between 2005 and Q4 2016, the market share for the largest gas supplier in the GB domestic market (British Gas) declined by 20 percentage points, to 35%. Nonetheless, this remains significantly higher than the next largest competitor (SSE), who held 12% in December 2016.

In the same period, the individual market shares of the remaining four large suppliers fluctuated between 5% and 13%.

Until 2012, all other suppliers held a market share of below 2%. Since then, their share has grown significantly. They reached a combined market share of 16% in Q4 2016. Six of these (Utility Warehouse, OVO, First Utility, Utilita, Extra Energy and Cooperative Energy) have increased their individual market shares above 1%, with First Utility reaching over 4%. In November 2016, Cooperative Energy acquired all the customers of GB Energy Supply. As a result, their market share increased by around 0.4 percentage points relative to Q3 2016.

Relevance and further information

The evolution of market shares is a useful measure of trends in market concentration. They help us understand the impact between market shares and competitive dynamics, both for the six large suppliers and other suppliers, and which companies are winning or losing customers.

Methodology

We calculate market shares from the number of meter points on the gas distribution networks, as provided to us by Xoserve. 

close

Chart

Javascript is required to render chart Number of active domestic suppliers by fuel type (GB).

Source: Ofgem analysis of distribution network operator (DNO) and supplier reports.

Information correct as of: December 2016

This chart shows the number of active licensed suppliers in the domestic gas and electricity markets. It also gives a breakdown by those supplying both gas and electricity, and those who supply only one fuel. 

Policy Areas:

  • Electricity - retail markets
  • Gas - retail markets

Data Table

Number of active domestic suppliers by fuel type (GB)
GasElectricity Gas and electricityTotal
Dec 2004101213
Dec 2005101112
Dec 200610910
Dec 2007101011
Dec2008101112
Dec 2009001212
Dec 2010001212
Dec 2011001414
Dec 2012221620
Dec 2013421824
Jun 2014222024
Sep 2014332127
Dec 2014322227
Mar 2015332329
Jun 2015332531
Sep 2015322833
Dec 2015533240
Mar 2016523643
Jun 2016513844
Sep 2016624048
Dec 2016634352

More information

At-a-glance summary

There were 52 active suppliers in the domestic gas and electricity retail markets as of December 2016. These consisted of the six vertically-integrated large suppliers and 46 other suppliers, mainly active in both gas and electricity.

Between 2004 and 2011, the number of active suppliers remained relatively stable. Since 2012, the number of active suppliers has been increasing due to significant entry of new suppliers. This growth accelerated in 2015 with the entry of 13 suppliers and continued with 12 more in 2016.

Relevance and further information

The number of active suppliers in the GB energy market helps us to understand the dynamics of market concentration over time, as new participants enter; win customers and some existing firms exit the market.

Methodology

We calculate the number of active licensed suppliers (i.e. those with customers) from the information that both network operators and suppliers provide to us. White label suppliers are not included in this number. 

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Chart

Source: ICIS data & Ofgem calculations.

Information correct as of: April 2017

This chart shows the monthly average of volatility for GB gas, electricity baseload and electricity peakload prices based on Day-ahead contracts.

Policy Areas:

  • Electricity - wholesale markets
  • Gas - wholesale markets

Data Table

Price volatility of gas and electricity by month: Day-ahead contracts (GB)
Month beginningElectricity (baseload)Electricity (peakload)Gas
01/01/200399%643%332%
01/02/2003102%635%313%
01/03/200356%232%158%
01/04/200338%135%128%
01/05/200340%177%141%
01/06/200347%216%192%
01/07/2003116%531%111%
01/08/2003159%687%141%
01/09/200384%424%210%
01/10/200356%323%194%
01/11/200360%334%135%
01/12/200377%484%125%
01/01/200490%407%256%
01/02/200494%452%444%
01/03/200439%127%113%
01/04/200428%118%105%
01/05/200430%162%115%
01/06/200442%228%67%
01/07/200435%169%58%
01/08/200418%105%70%
01/09/200418%125%100%
01/10/200443%144%126%
01/11/200456%238%133%
01/12/200442%211%119%
01/01/200546%231%131%
01/02/200537%167%126%
01/03/200581%319%416%
01/04/200532%153%160%
01/05/200517%72%93%
01/06/200526%124%135%
01/07/200546%279%126%
01/08/200517%106%92%
01/09/200529%146%89%
01/10/200533%176%103%
01/11/200550%194%226%
01/12/200579%338%294%
01/01/200670%282%209%
01/02/200659%205%205%
01/03/2006114%436%389%
01/04/200681%331%291%
01/05/200623%94%121%
01/06/200629%145%219%
01/07/200665%302%182%
01/08/200690%444%90%
01/09/200638%190%105%
01/10/200648%227%567%
01/11/200672%297%217%
01/12/200687%328%183%
01/01/200763%294%154%
01/02/200741%194%120%
01/03/200730%154%140%
01/04/200733%167%86%
01/05/200742%219%106%
01/06/200753%290%84%
01/07/200740%181%107%
01/08/200733%129%95%
01/09/200744%172%127%
01/10/200775%248%122%
01/11/200792%413%113%
01/12/200777%363%91%
01/01/200861%266%92%
01/02/200820%102%50%
01/03/200815%70%49%
01/04/200831%156%41%
01/05/200824%111%78%
01/06/200843%234%48%
01/07/200843%203%75%
01/08/200833%160%212%
01/09/200834%149%146%
01/10/200841%156%105%
01/11/200848%212%144%
01/12/200860%277%98%
01/01/200960%275%110%
01/02/200935%151%100%
01/03/200923%98%87%
01/04/200916%66%96%
01/05/200928%102%71%
01/06/200931%109%82%
01/07/200931%112%68%
01/08/200918%65%81%
01/09/200928%111%203%
01/10/200921%92%266%
01/11/200918%93%106%
01/12/200922%89%66%
01/01/201031%127%141%
01/02/201020%50%99%
01/03/201010%42%60%
01/04/201013%51%75%
01/05/201020%77%113%
01/06/201016%60%73%
01/07/201014%59%55%
01/08/201011%52%49%
01/09/20108%34%72%
01/10/201013%47%83%
01/11/201014%56%42%
01/12/201051%239%49%
01/01/201123%112%40%
01/02/20118%30%38%
01/03/201112%37%31%
01/04/201113%40%53%
01/05/20116%26%55%
01/06/20116%26%22%
01/07/20116%31%22%
01/08/20118%32%24%
01/09/201112%48%66%
01/10/201113%65%86%
01/11/201114%51%48%
01/12/20119%44%34%
01/01/201212%43%36%
01/02/201225%108%144%
01/03/201215%70%70%
01/04/201214%50%49%
01/05/201211%42%29%
01/06/201211%54%29%
01/07/201210%39%28%
01/08/20128%34%29%
01/09/201210%34%30%
01/10/201212%43%25%
01/11/201221%87%24%
01/12/201220%70%20%
01/01/201320%80%32%
01/02/201320%79%32%
01/03/201337%125%87%
01/04/201333%119%105%
01/05/201314%42%25%
01/06/201313%44%35%
01/07/201313%45%46%
01/08/201311%29%18%
01/09/201313%35%15%
01/10/201314%51%21%
01/11/201320%75%33%
01/12/201321%73%20%
01/01/201421%77%17%
01/02/201416%60%19%
01/03/201419%53%35%
01/04/201415%47%33%
01/05/201412%41%30%
01/06/201410%35%42%
01/07/201412%53%43%
01/08/201412%53%47%
01/09/201418%74%51%
01/10/201423%89%41%
01/11/201442%187%50%
01/12/201426%108%26%
01/01/201528%90%36%
01/02/201524%97%39%
01/03/201518%74%38%
01/04/201517%51%27%
01/05/201517%48%28%
01/06/201517%50%28%
01/07/201514%47%22%
01/08/201512%37%31%
01/09/201511%41%28%
01/10/201511%43%24%
01/11/201517%64%36%
01/12/201523%71%34%
01/01/201629%115%39%
01/02/201630%149%39%
01/03/201633%170%25%
01/04/201628%121%27%
01/05/201624%117%58%
01/06/201621%96%39%
01/07/201624%104%32%
01/08/201626%126%43%
01/09/2016151%495%131%
01/10/2016182%663%87%
01/11/2016141%638%43%
01/12/201685%425%41%

More information

Price volatility of gas and electricity (Day-ahead contracts): At-a-glance summary

The volatility of Day-ahead gas and power prices has been generally decreasing in recent years. This is consistent with a number of recent trends including the declining profitability of conventional flexible generation, the closure or mothballing of old gas and oil-fired plants, and low levels of investment in new flexible gas capacity.  Volatility for both gas and power remained low over the course of 2015 and the first half of 2016, but increased at the end of Q3 2016.

Relevance and further information

Price volatility is an important market indicator for a range of reasons. For example:

  • Companies with capacity that can flexibly increase or decrease their supply of gas or electricity can profit from high volatility by increasing output when prices are high and decreasing output when prices are low. Such companies include gas storage facilities or conventional coal and gas-fired power stations.
  • High levels of volatility can challenge smaller companies where they are less able to access credit and collateral. 

Methodology

Price volatility is calculated to European Commission guidelines

The monthly calculation takes the logarithmical differences of daily average prices across two consecutive trading days. These are used to calculate the relative standard deviation on a rolling monthly basis (21 trading days). 

To show the data in annual terms, the value obtained is multiplied by the square root of the total number of trading days in a year (252 trading days). 

Volatility values are usually expressed as a percentage, so the annual value is finally multiplied by 100. 

All volatility values for a given month are then averaged together to get a single monthly data point.

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Chart

Source: Ofgem calculations using data from ICIS .

Information correct as of: April 2017

The chart shows summer-winter spreads for the GB gas market. The summer-winter spread is the difference between the gas price in summer compared to the following winter price.

Policy Areas:

  • Gas - wholesale markets

Data Table

Gas summer-winter spreads at the National Balancing Point (GB)
Month beginning2005-062006-072007-082008-092009-102010-112011-122012-132013-142014-152015-162016-172017-182018-19
01/04/200412.111.17
01/05/200412.210.72
01/06/200412.2910.52
01/07/200413.5110.6
01/08/200414.2111.04
01/09/200415.7412.21
01/10/200419.5612.41
01/11/200418.2511.53
01/12/200417.5412.44
01/01/200520.5612.54
01/02/200522.5612.95
01/03/200527.3114.99
01/04/200518.9511.43
01/05/200522.9315.94
01/06/200528.6221.61
01/07/200535.123.67
01/08/200529.4217.95
01/09/200527.6618.64
01/10/200525.0719
01/11/200531.2222.18
01/12/200538.3328.45
01/01/200642.5731.41
01/02/200636.127.45
01/03/200641.1828.4
01/04/200647.4431.2726.7
01/05/200630.9325.98
01/06/200629.0924.08
01/07/200625.4419.99
01/08/200623.7316.36
01/09/200622.4314.78
01/10/200622.0314.88
01/11/200619.5714.57
01/12/200621.5515.3
01/01/200720.8213.69
01/02/200722.4213.01
01/03/200728.7416.04
01/04/200731.211714.4
01/05/200718.6715.22
01/06/200718.314.94
01/07/200716.9114.41
01/08/200715.1812.79
01/09/200714.3612.09
01/10/200713.6810.88
01/11/200713.8910.8
01/12/200714.8611.35
01/01/200816.7612.64
01/02/200817.5814.17
01/03/200817.9315.77
01/04/200815.5912.75
01/05/200815.2413.58
01/06/200817.3712.87
01/07/200819.7713.73
01/08/200821.5315.88
01/09/200820.5116.81
01/10/200818.616.78
01/11/200818.5516.11
01/12/200817.8915.09
01/01/200918.0715.54
01/02/200920.1616.29
01/03/200924.2218.09
01/04/200921.1917.21
01/05/200920.117
01/06/200919.6416.05
01/07/200919.4815.8
01/08/200921.2316.43
01/09/200918.814.21
01/10/200919.8315.25
01/11/200918.5114.93
01/12/200919.2413.75
01/01/201017.6214.09
01/02/201015.1213.86
01/03/201013.0312.39
01/04/201010.8712.2112.02
01/05/201012.3411.71
01/06/201012.0611.54
01/07/201010.910.77
01/08/201010.689.6
01/09/201010.839.61
01/10/201010.739.93
01/11/201010.128.99
01/12/20108.928.52
01/01/20118.737.8
01/02/20119.677.76
01/03/201111.28.38
01/04/20119.279.38
01/05/20119.349.58
01/06/20119.889.71
01/07/201111.3310.23
01/08/201111.9110.14
01/09/201111.349.65
01/10/2011129.59
01/11/201113.4810.33
01/12/201114.5411.33
01/01/201215.7311.98
01/02/201216.2512.72
01/03/201216.6913.18
01/04/201216.112.7311.46
01/05/201212.3511.12
01/06/201211.2710.17
01/07/201210.839.82
01/08/201211.689.78
01/09/201211.199.56
01/10/201210.549.51
01/11/20129.949.72
01/12/201210.169.78
01/01/201310.039.51
01/02/20138.629.02
01/03/20137.969.15
01/04/20137.288.588.25
01/05/20138.347.81
01/06/20138.297.93
01/07/20137.918.14
01/08/20137.548.01
01/09/20137.628.06
01/10/20137.17.88
01/11/20137.087.65
01/12/20137.777.93
01/01/20148.247.99
01/02/20149.898.38
01/03/201411.199.18
01/04/20149.538.6
01/05/20149.918.69
01/06/201410.188.9
01/07/201410.848.95
01/08/201410.259.63
01/09/201410.419.37
01/10/201410.099.01
01/11/20149.278.65
01/12/20148.318.35
01/01/20157.98.61
01/02/20158.028.72
01/03/20157.757.88
01/04/20157.677.06
01/05/20157.97.25
01/06/20157.897.16
01/07/20157.266.84
01/08/20156.816.02
01/09/20156.465.84
01/10/20156.65.85
01/11/20154.794.43
01/12/20155.564.78
01/01/20165.684.84
01/02/20167.035.3
01/03/20167.15.56
01/04/20166.125.51
01/05/20165.644.91
01/06/20165.615.07
01/07/20166.535.58
01/08/20166.445.69
01/09/20166.235.73
01/10/20166.475.84
01/11/20166.135.79
01/12/20166.935.95

More information

Gas summer-winter spreads: At-a-glance summary

Summer-winter spreads have fallen significantly over the past decade and continue to remain low. The spreads for 2018-2019 are currently low by historical standards. These trends are at least partly because of increased import capacity. Much of this new capacity is able to operate flexibly. It can often be a substitute for storage by responding to variations in demand.

Relevance and further information

The summer-winter spread is an important indicator of trends in the profitability of long-range or seasonal gas storage. This is because gas storage facilities generally make money by injecting gas when the price is low (i.e. in summer) and withdrawing it when the price is high (i.e. in winter).

Methodology

The summer-winter spread is calculated by subtracting the average contract price of quarters two and three from the contract price of the following quarter one in a given year.

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Chart

Javascript is required to render chart Spark and dark spreads (GB).

Source: Ofgem analysis of data from ICIS and Bloomberg.

Information correct as of: April 2017

The chart shows clean spark and dark spreads in GB. These indicate the average revenue a power station can expect from generating a unit of electricity during ‘baseload’ operation, after fuel and carbon costs. 

Clean spark spreads refer to gas generation and clean dark spreads refer to coal generation. 

Policy Areas:

  • Electricity - wholesale markets

Data Table

Spark and dark spreads (GB)
DateSpark (low eff)SparkSpark (high eff)DarkPower price (baseload)
01/10/200710.6213.9418.9226.3643.17
01/11/200718.4922.3828.2139.1757.35
01/12/200710.5514.6220.7332.7751.24
01/01/200815.1819.4325.8239.0658.2
01/02/200812.6616.7122.7734.8853.08
01/03/200811.4615.8122.3335.4855.03
01/04/200819.7724.6832.0447.0968.85
01/05/200825.5330.1937.1949.3672.09
01/06/200838.2743.2450.762.8988.01
01/07/200840.4845.2952.4964.0388.53
01/08/200839.7544.0650.5360.2183.21
01/09/200850.2755.864.182.6105.58
01/10/200841.3545.9252.7867.8287.06
01/11/200825.4129.8236.4552.9569.56
01/12/200816.6821.2228.014662.01
01/01/200913.9218.7125.8947.8861.79
01/02/20098.6112.317.8333.6345.52
01/03/20099.7512.3316.2123.7235.58
01/04/200912.1714.5218.0522.1435.67
01/05/200913.6615.8919.2321.4435.9
01/06/200913.6115.7518.9521.8734.98
01/07/200915.217.0819.8920.7733.97
01/08/200915.6317.4420.1519.8233.72
01/09/200916.1117.7720.2518.7832.68
01/10/200915.0817.1420.2421.5135.72
01/11/200911.7513.9417.2320.1233.68
01/12/200910.2912.8216.612235.57
01/01/20108.3211.4716.226.7439.85
01/02/20107.4410.2914.5623.1735.92
01/03/20108.9911.5615.4321.6434.75
01/04/201010.5213.1617.1122.8336.88
01/05/20109.8212.9717.726.3641.33
01/06/20108.6411.9917.0127.4242.18
01/07/20107.2710.8916.3329.743.53
01/08/20106.29.5714.6426.0639.95
01/09/20108.6611.9116.7826.441.12
01/10/20107.1410.7816.2328.1743.5
01/11/20107.2311.1417.0231.6446.4
01/12/20109.4814.3321.6243.4158.03
01/01/20114.478.8615.4633.8648.43
01/02/20114.238.4514.7931.6846.47
01/03/20113.888.6315.7634.9451.41
01/04/20115.7410.2517.0233.6350.88
01/05/20115.319.816.5533.4450.27
01/06/20115.049.6216.4834.9850.82
01/07/20114.869.1715.6334.3847.96
01/08/20115.099.3215.6634.247.36
01/09/20116.4210.6116.935.5148.32
01/10/20113.257.6114.1535.3646.83
01/11/20111.115.6112.3735.7846.15
01/12/20110.294.6211.134.8443.54
01/01/20120.224.4110.7134.0742.17
01/02/2012-1.353.711.2639.8449.1
01/03/20120.565.0711.8337.1545.64
01/04/2012-0.234.3811.338.145.91
01/05/2012-0.084.3110.8936.5143.79
01/06/2012-0.283.9810.3534.4942.24
01/07/2012-0.154.1310.5634.8642.71
01/08/2012-0.853.359.6633.2241.21
01/09/2012-3.191.478.4535.343.39
01/10/2012-1.953.0110.4439.4347.6
01/11/2012-1.483.5711.1441.0749
01/12/2012-0.954.1211.7342.4349.76
01/01/2013-1.233.8911.5743.7449.96
01/02/2013-1.27411.9145.4651.44
01/03/2013-3.173.4413.3557.4162.9
01/04/2013-2.752.6510.7641.2951.3
01/05/2013-2.212.910.5739.248.89
01/06/20130.435.1212.1537.1447.31
01/07/2013-1.763.2810.8638.4848.73
01/08/2013-2.762.249.7536.9847.31
01/09/2013-1.323.7811.4238.6749.63
01/10/2013-2.222.8210.3937.4448.22
01/11/20130.225.513.4242.6453.05
01/12/2013-2.852.5110.5640.1950.81
01/01/2014-2.792.269.8336.9447.67
01/02/2014-0.733.8510.7433.3245.15
01/03/20140.344.7411.3632.9144.41
01/04/20142.286.2312.1526.5841.77
01/05/20143.597.212.624.5739.62
01/06/20145.038.212.9421.3836.67
01/07/20145.38.3212.8419.9335.46
01/08/20145.488.7313.622.137.95
01/09/20144.828.6614.4327.6543.28
01/10/20144.868.8514.8429.1744.81
01/11/20145.059.3915.932.1548.43
01/12/20141.485.7312.127.6543.96
01/01/20153.116.7912.323.939.86
01/02/20152.446.4712.526.5942.86
01/03/20153.297.0412.6625.2140.91
01/04/20155.669.4915.2520.0544.03
01/05/20155.078.6814.0816.9741.13
01/06/20156.29.7615.1117.6841.84
01/07/20156.4410.0215.3817.9742.2
01/08/20157.9911.2916.2416.5340.99
01/09/20158.1911.5916.717.6442.23
01/10/20157.4610.7415.6715.5840.3
01/11/20158.1811.1815.6913.638.2
01/12/20156.339.213.510.4735
01/01/20169.7512.4516.5113.0436.8
01/02/20168.5211.0214.7811.0333.59
01/03/20169.8612.3616.1212.4834.92
01/04/20169.0211.5115.2610.9333.99
01/05/20168.8311.4115.2811.3834.64
01/06/20168.7411.615.914.1637.37
01/07/20169.7912.6516.9315.438.37
01/08/201610.8913.4517.2913.3336.47
01/09/201629.3431.7335.3330.4353.32
01/10/201625.8829.3334.5036.3161.12
01/11/201630.3834.3040.1844.7869.60
01/12/201613.3217.1322.8527.2151.42

More information

Spark and dark spreads: At-a-glance summary

Higher clean dark spreads relative to clean spark spreads indicate that coal generation has been more profitable than gas in the last five years. This has resulted in coal generation running more intensively. However, in recent times, more efficient gas-fired generation has overtaken coal generation as being more profitable. This can be largely attributed to falling gas prices.

Relevance and further information

Clean spark and dark spreads give some insight into the profitability of coal and gas-fired generation. As such this is a good indication of which kinds of plants are likely to operate or whether investment in new plant is likely. 

Methodology

Dark and spark spreads are calculated using the following fuel efficiency assumptions.  

The efficiencies used are: Dark = 35%, Spark = 50%, Spark (high efficiency) = 60%, Spark (low efficiency) = 45%.

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