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Chart

Source: ICIS.

Information correct as of: September 2018

This chart shows the price of electricity on the wholesale market in GB for delivery the next working day at a constant ‘baseload’ rate. The data is averaged by month rather than by day and covers around an eight year time period. Further information on wholesale prices can be found in our Wholesale Energy Markets in 2016 report.

The data comes from ICIS’s price assessment of over-the-counter trading through brokers. A full explanation of ICIS’s methodology is available on ICIS's website.

Policy Areas:

  • Electricity - wholesale markets

Data Table

Electricity prices: Day-ahead baseload contracts – monthly average (GB)

Month beginningPrice
01/06/201042.18
01/07/201043.53
01/08/201039.95
01/09/201041.12
01/10/201043.5
01/11/201046.4
01/12/201058.03
01/01/201148.43
01/02/201146.47
01/03/201151.41
01/04/201150.88
01/05/201150.27
01/06/201150.82
01/07/201147.96
01/08/201147.36
01/09/201148.32
01/10/201146.83
01/11/201146.15
01/12/201143.54
01/01/201242.17
01/02/201249.1
01/03/201245.64
01/04/201245.91
01/05/201243.79
01/06/201242.24
01/07/201242.71
01/08/201241.21
01/09/201243.39
01/10/201247.6
01/11/201249
01/12/201249.76
01/01/201349.96
01/02/201351.44
01/03/201362.9
01/04/201351.3
01/05/201348.89
01/06/201347.31
01/07/201348.73
01/08/201347.31
01/09/201349.63
01/10/201348.22
01/11/201353.05
01/12/201350.81
01/01/201447.67
01/02/201445.15
01/03/201444.41
01/04/201441.77
01/05/201439.62
01/06/201436.67
01/07/201435.46
01/08/201437.95
01/09/201443.28
01/10/201444.81
01/11/201448.43
01/12/201443.96
01/01/201539.86
01/02/201542.86
01/03/201540.91
01/04/201543.97
01/05/201541.21
01/06/201541.66
01/07/201542.2
01/08/201540.86
01/09/201542.04
01/10/201540.29
01/11/201538.01
01/12/201535.07
01/01/201636.95
01/02/201633.85
01/03/201634.76
01/04/201634.37
01/05/201634.61
01/06/201637.51
01/07/201638.4
01/08/201636.51
01/09/201651.13
01/10/201656.03
01/11/201667.54
01/12/201649.87
01/01/201753.37
01/02/201749.49
01/03/201741.99
01/04/201742.10
01/05/201741.24
01/06/201739.68
01/07/201743.05
01/08/201743.34
01/09/201747.17
01/10/201746.68
01/11/201751.45
01/12/201756.18
01/01/201850.84
01/02/201853.68
01/03/201856.79
01/04/201850.74
01/05/201854.25
01/06/201854.00

More information

Electricity prices (Day-ahead, baseload contracts): At-a-glance summary

Electricity wholesale prices in GB over the past decade have largely been driven by changes in the gas price. This is because gas-fired generation is often the marginal source of supply and hence sets the electricity price. Changes in carbon prices have also influenced electricity prices in recent years.

Relevance and further information

Day-ahead prices are a good indicator of the short-term price of electricity in GB. However, Day-ahead prices are just one measure of the price of electricity. Suppliers will often buy most of their electricity months or even years in advance of when it will be delivered, so Day-ahead prices may not necessarily reflect the price that suppliers will have paid for their electricity.

The ‘baseload’ rate refers to a contract for electricity that is produced continually throughout the day and is distinct from ‘peak rates’ when electricity is bought/sold for consumption at peak times (7am to 7pm).  

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Chart

Javascript is required to render chart Gas prices: Day-ahead contracts – monthly average (GB).

Source: ICIS.

Information correct as of: September 2018

This chart shows ‘Day-ahead’ gas prices at the GB gas hub (the National Balancing Point) for delivery the following working day. The data is averaged by month rather than by day and covers Q4 2009 to Q2 2018. Further information on wholesale prices can be found in our Wholesale Energy Markets in 2016 report.

The data comes from ICIS’s price assessment of over-the-counter trading through brokers. A full explanation of ICIS’s methodology is available on ICIS's website.

Policy Areas:

  • Gas - wholesale markets

Data Table

Gas prices: Day-ahead contracts – monthly average (GB)

Month beginningPrice
01/10/200925.18
01/11/200926.99
01/12/200931.42
01/01/201039.77
01/02/201035.78
01/03/201032.14
01/04/201032.79
01/05/201039.49
01/06/201042.15
01/07/201045.94
01/08/201042.61
01/09/201040.77
01/10/201046
01/11/201049.66
01/12/201062.26
01/01/201155.98
01/02/201153.74
01/03/201160.39
01/04/201157.23
01/05/201157.01
01/06/201158.25
01/07/201155.09
01/08/201154.06
01/09/201153.64
01/10/201156.05
01/11/201158.15
01/12/201156.04
01/01/201254.43
01/02/201265.41
01/03/201258.44
01/04/201259.94
01/05/201257.01
01/06/201255.15
01/07/201255.6
01/08/201254.53
01/09/201260.45
01/10/201264.35
01/11/201265.63
01/12/201265.5
01/01/201366.83
01/02/201368.88
01/03/201386.57
01/04/201369.98
01/05/201366.14
01/06/201360.47
01/07/201365.23
01/08/201364.65
01/09/201365.71
01/10/201365.08
01/11/201368.29
01/12/201369.35
01/01/201465.1
01/02/201458.86
01/03/201456.53
01/04/201449.89
01/05/201445.33
01/06/201439.5
01/07/201437.51
01/08/201440.61
01/09/201448.43
01/10/201450.42
01/11/201454.84
01/12/201453.62
01/01/201546.1
01/02/201550.47
01/03/201547.23
01/04/201546.86
01/05/201544.09
01/06/201543.37
01/07/201543.47
01/08/201539.69
01/09/201541.04
01/10/201539.56
01/11/201535.9
01/12/201534.03
01/01/201632.05
01/02/201629.66
01/03/201629.6
01/04/201629.44
01/05/201630.41
01/06/201634.2
01/07/201634.3
01/08/201630.36
01/09/201628.36
01/10/201642.83
01/11/201648.12
01/12/201646.53
01/01/201753.39
01/02/201751.01
01/03/201741.02
01/04/201739.73
01/05/201739.29
01/06/201734.84
01/07/201736.21
01/08/201742.57
01/09/201746.00
01/10/201745.40
01/11/201752.95
01/12/201758.29
01/01/201850.44
01/02/201858.96
01/03/201864.30
01/04/201850.94
01/05/201855.58
01/06/201854.97

More information

Gas prices (Day-ahead contracts): At-a-glance summary

Day-ahead gas prices have been on a broadly upward trend from mid-Summer 2017. Changes in oil prices have influenced gas prices in recent months.

Relevance and further information

Day-ahead prices are a good indicator of the short-term price of gas in GB. However, Day-ahead prices are just one measure of the price of gas. Suppliers often buy most of their gas months or even years in advance of when it will be delivered. Therefore, Day-ahead prices may not necessarily reflect the price that suppliers will have paid for their gas.

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Chart

Javascript is required to render chart Total fines and redress payments since 2010.

Source: Investigations and enforcement data.

Information correct as of: 17 September 2018

This graph details the financial penalties that we have imposed on energy companies since 2010. These include fines (penalties which are directly paid to the Treasury) and redress payments (where we come to an arrangement with a company to take action that will directly benefit consumers), such as payments to social programmes like the Warm Home Discount.

Policy Areas:

  • Enforcement

Data Table

Total fines and redress payments since 2010

Fines (£)Redress payments (£)Total payments (£)
201015,000,000200,00015,200,000
201110,000,0003,638,00013,638,000
201210,200,0016,559,50016,759,501
201311,000,00122,000,00033,000,001
2014925,00434,809,90035,734,904
20155,000,02666,927,35371,927,379
20168 51,957,992 51,958,000
2017219,030,99819,031,000
20182,400,0014,077,6316,477,632
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Chart

Source: Energylinx (Until May 2017) & Energyhelpline (June 2017 onwards).

Information correct as of: August 2018

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.

From February 2017 the prices shown in the chart are calculated using the new TDCV values that entered into effect from 1st of October 2017 (see the methodology section for more details).

In practical terms, this means that the tariffs offered after February 2017 are likely to appear slightly lower than those before February 2017.  

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)
28/01/2012915.27976.701021.54906.56971.04969.61
28/02/2012886.18976.701021.54878.10971.04969.61
28/03/2012886.18976.701021.54878.10971.04969.61
28/04/2012895.69953.401021.54878.10953.40969.24
28/05/2012895.69953.401021.54878.10890.12969.24
28/06/2012895.69953.401021.54895.69953.401017.42
28/07/2012895.69953.401021.54875.93953.401017.42
28/08/2012899.10957.031021.54875.93957.031017.42
28/09/2012901.471020.711021.54875.93988.141017.42
28/10/2012906.171020.711069.39893.85988.141019.30
28/11/2012958.211020.711069.39909.59979.351045.64
28/12/2012990.701071.381133.19909.59979.351045.64
28/01/2013957.181037.201133.19909.59979.351045.64
28/02/2013957.181037.201133.19909.591037.201045.64
28/03/2013966.541046.571133.19909.591046.571045.64
28/04/2013966.541046.571133.19909.591046.571045.64
28/05/2013966.541046.571133.19962.43996.901045.64
28/06/2013966.541046.571133.19769.95996.901045.64
28/07/2013984.681075.511133.19769.95996.901045.64
28/08/2013971.771051.791133.19769.951051.791045.64
28/09/2013971.771051.791133.19769.951051.791045.64
28/10/20131011.801079.911133.19769.951070.991093.35
28/11/2013993.401058.151150.97769.951058.151093.35
28/12/20131033.471101.651178.61769.951101.651093.35
28/01/20141033.471101.651178.61975.211101.651172.77
28/02/20141033.971108.101178.61966.341108.101172.77
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
28/06/20141000.381069.951170.86944.551069.951162.40
28/07/20141000.381069.951170.86944.951029.051162.40
28/08/20141000.381069.951170.86943.431038.881154.43
28/09/2014960.901030.951170.86942.271030.951154.43
28/10/2014953.401046.451170.86931.021024.451154.43
28/11/2014921.881003.791170.86914.511003.791154.43
28/12/2014916.211003.791170.86906.141003.791151.22
28/01/2015875.40945.461148.99871.26945.461148.99
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
28/04/2016723.91793.481070.37723.91793.481030.27
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
28/02/2017928.481033.401015.43829.10935.19970.67
28/03/2017922.231016.741019.21829.10949.48970.67
28/04/2017923.551018.06994.53863.31946.43970.67
28/05/2017923.571018.08994.53826.52923.47979.27
28/06/2017923.571018.08994.53835.76923.23979.27
28/07/2017922.821017.33994.53829.91923.23979.27
28/08/2017910.051004.56988.90810.11923.47979.27
28/09/2017904.481051.43988.90826.73923.47979.27
28/10/2017897.981012.47988.90826.73943.35978.04
28/11/2017928.591100.89988.90826.73958.08978.04
28/12/2017973.041051.43988.90798.72958.08957.12
28/01/2018907.891051.43988.90809.32958.08960.06
28/02/2018900.981050.871028.21810.06958.08945.76
28/03/2018900.981074.651028.21810.11958.08945.76
28/04/20181000.421143.141030.55788.16958.08946.63
28/05/2018962.531057.041030.93788.16958.08946.63
28/06/2018953.161033.191070.34796.99958.08946.63
28/07/2018965.271045.291070.34826.73990.66946.63

More information

At-a-glance summary

Direct debit customers have traditionally been offered the cheapest tariffs, followed by standard credit customers and then those using prepayment meters.  

After the introduction of the prepayment safeguard tariff in April 2017, the overall cheapest tariffs have continued to be those for direct debit customers. However, the ranking between standard credit and prepayment cheapest tariffs has fluctuated over time. In June 2018, the large six suppliers’ cheapest tariff for prepayment customers was greater than the cheapest tariff offered to standard credit customers and this has continued into July. By contrast, across the market, the cheapest tariff for prepayment customers in July 2018 was below the cheapest tariff offered to standard credit customers.

A prepayment safeguard tariff was introduced on 1 April 2017, limiting the amount that suppliers can charge their prepayment customers. We extended the safeguard tariff to a further one million vulnerable customers in receipt of the government’s Warm Home Discount on 2 February 2018. For more information on the impact of the safeguard tariff, please see 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 tariff types using a ‘typical medium domestic consumer’. As of October 2017, typical consumption values for a medium consumer are 12,000kWh/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 licences that partner with an active licensed supplier to offer gas and electricity using their own brand.

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Chart

Source: Energylinx (Until May 2017) & Energyhelpline (June 2017 onwards).

Information correct as of: August 2018

This chart compares trends in prices since 2016 for a dual fuel customer paying by direct debit or prepayment. It shows both the market cheapest tariffs and average standard variable tariffs (SVT) for the two payment methods. The values are calculated for a customer with typical energy use.

From February 2017 the prices shown in the chart, including the level of the prepayment price cap, are calculated using the new TDCV values that entered into effect from 1st of October 2017 (see the methodology section for more details).

In practical terms, this means that the tariffs offered after February 2017 are likely to appear slightly lower than those before February 2017.  

Policy Areas:

  • Electricity - retail markets
  • Electricity - wholesale markets
  • Gas - retail markets
  • Gas - wholesale markets

Data Table

Safeguard tariff and direct debit prices since January 2016 (GB)

DateSVT - direct debit (market average)SVT - prepayment (market average)Cheapest tariff - direct debit (all suppliers)Cheapest tariff - prepayment (all suppliers)Safeguard tariff
28/12/20151091.691163.44770.591055.61
28/01/20161091.141163.18765.001055.61
28/02/20161086.371158.61738.381054.20
28/03/20161067.321138.39727.451051.22
28/04/20161059.621131.32723.911030.27
28/05/20161059.621131.32723.231017.61
28/06/20161059.621131.32723.23985.97
28/07/20161059.501130.22758.31985.97
28/08/20161059.501130.22769.65985.97
28/09/20161059.501130.22744.30985.97
28/10/20161059.681130.22741.92985.97
28/11/20161059.681122.72790.02985.97
28/12/20161059.681122.72790.02985.97
28/01/20171057.191115.77833.71985.97
28/02/20171059.301061.14829.10970.67
28/03/20171088.781059.99829.10970.67
28/04/20171095.821032.30863.31970.671050.35
28/05/20171095.821032.30826.52979.271050.35
28/06/20171095.821032.30835.76979.271050.35
28/07/20171095.401032.69829.91979.271050.35
28/08/20171096.131031.31810.11979.271050.35
28/09/20171122.931034.46826.73979.271050.35
28/10/20171123.131030.60826.73978.041031.27
28/11/20171123.131030.60826.73978.041031.27
28/12/20171123.131030.60826.73957.121031.27
28/01/20181112.861030.72820.11960.061031.27
28/02/20181112.861030.72820.11945.761031.27
28/03/20181112.861030.85810.11945.761031.27
28/04/20181115.821079.09788.16946.631088.55
28/05/20181115.821086.20788.16946.631088.55
28/06/20181148.751086.19796.99946.631088.55
28/07/20181164.291086.08826.73946.631088.55
28/08/20181088.55

More information

At-a-glance summary

In April 2017, the new safeguard tariff came into force, limiting the amount that suppliers can charge their prepayment customers. These customers tend to be unable to access the cheapest deals and are also more likely to be in vulnerable circumstances.

The cheapest prepayment tariffs available in the market have remained below the average SVT for a prepayment customer following the introduction of the safeguard tariff.

We extended the safeguard tariff to a further one million vulnerable customers in receipt of the government’s Warm Home Discount on 2 February 2018.

From 1 April 2018, the level of the safeguard tariff rose from £1,031 to £1,089 for a dual fuel customer who uses a typical amount of energy. This increase is mainly due to higher wholesale energy costs and policy costs to support low carbon forms of electricity generation. See our chart for further details, Breakdown of the safeguard tariff.

As suppliers increased their prepayment SVT prices to the new level of the cap, the differential between the average prepayment SVT and the market cheapest PPM tariff increased to £139 in May 2018 and has remained at this level through to July 2018. The average bill for prepayment customers on an SVT, which used to be amongst the highest in the market, is around £78 lower than the current standard variable tariff (SVT) paid by direct debit customers as of July 2018.

Relevance and further information

This chart helps us track the differences between the price a customer will pay depending on if they use prepayment (where prices are capped) or direct debit to pay their energy bills.

You can find further information on the Safeguard tariff (or 'price cap') here. The cap lasts until 2020. By then we expect the smart meter roll-out to give prepay customers access to better deals.

Methodology

  • We calculate the bill values associated with the different tariff types using a ‘typical medium domestic consumer’. As of October 2017, typical consumption values for a medium consumer are 12,000kWh/year for gas and 3,100kWh/year for electricity (profile class 1). 
  • All prices shown are for a dual fuel customer (i.e. where a customer takes gas and electricity from the same supplier). 
  • The market average SVTs are based on the prices of the 10 largest suppliers in the direct debit and prepayment segments. We have weighted the SVT of each supplier using an estimate of their total share of all SVT customers (for direct debit), and their total share of all prepayment accounts (for prepayment). We update the weightings every six months in January and July to reflect customer numbers four months prior to publication. The time lag is due to data availability. For example, the average given for 28 January 2017 uses weights based on customer numbers at 31 October 2016, while the average for 28 December 2016 uses weights at 31 March 2016.
  • An SVT refers to a supply contract which is for a period of an indefinite length, and which does not have a fixed-term period applying 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 onto an SVT until they have chosen a new one. A customer can also make an active choice to select an SVT.
  • We exclude tariffs with limited availability – such as tariffs only available to new customers (also known as ‘acquisition’ tariffs) or tariffs restricted to certain regions - when calculating the market cheapest tariff. This is so we give a representative picture of tariffs generally available to all customers across GB.
  • We include tariffs available with ‘white label’ suppliers in our calculation of the cheapest tariffs. White label suppliers are organisations without supply licences that partner with an active licensed supplier to offer gas and electricity using their own brand.
  • The cheapest tariff shown on the chart includes any collective switching tariffs after the first quarter of 2016.

In all cases, the prices shown are based on suppliers’ tariffs averaged across GB regions. The level of the prepayment price cap is based on the values published on our website, adjusted to reflect current typical domestic consumption values, and to include VAT.

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Chart

Source: Ofgem analysis of data from electricity distribution network operators (DNOs) and Xoserve.

Information correct as of: August 2018

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).

In June 2018 SSE and Together Energy informed us of corporate migrations of customers affecting their past domestic switching volumes. We have accordingly corrected the total number of electricity switches for January and February 2018.

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 electricity other suppliersSwitches to gas other suppliersNet gains for electricity other suppliersNet gains for gas other suppliers
01/01/2003326,000266,000
01/02/2003337,000167,000
01/03/2003368,000239,000
01/04/2003351,000216,000
01/05/200332,7000245,000
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
01/01/2010259,000307,0006,622
01/02/2010353,000217,0008,884
01/03/2010460,000316,0007,735
01/04/2010379,000307,0009,193
01/05/2010352,000271,0007,564
01/06/2010413,000289,0002,986
01/07/2010398,000292,0003,007
01/08/2010419,000296,0003,928
01/09/2010426,000305,0006,836
01/10/2010409,000305,0004,253
01/11/2010456,000322,00010,827
01/12/2010425,000328,00011,251
01/01/2011270,000279,0003,280
01/02/2011324,000211,0006,340
01/03/2011400,000307,0006,597
01/04/2011360,000246,0004,273
01/05/2011356,000308,0007,479
01/06/2011393,000259,0008,895
01/07/2011397,000301,0008,868
01/08/2011449,000343,00016,021
01/09/2011343,000309,00013,281
01/10/2011326,000247,00019,478
01/11/2011329,000240,00019,854
01/12/2011259,000219,00012,620
01/01/2012210,000194,00022,337
01/02/2012257,000149,00029,128
01/03/2012279,000190,00020,817
01/04/2012232,000176,00012,872
01/05/2012286,000202,00019,167
01/06/2012272,000192,00041,228
01/07/2012257,000190,00018,762
01/08/2012265,000187,00013,366
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
01/06/2016335,879252,712143,231104,67464,39143,204
01/07/2016303,404221,175140,898103,66270,82950,962
01/08/2016310,132209,178149,026108,99774,44557,084
01/09/2016349,203271,374154,142116,03268,91647,780
01/10/2016486,878384,023150,747118,32820,32816,409
01/11/2016386,585297,468147,607116,24536,64423,680
01/12/2016423,068317,740230,753176,05191,05368,890
01/01/2017319,503239,759203630158,23097,49678,267
01/02/2017398,150296,055220,784173,226107,16787,624
01/03/2017512,855388,103280,224223,528142,15511,3040
01/04/2017449,463327,288274,019212,426143,76711,4270
01/05/2017414,285304,615251,465193,355124,32799,986
01/06/2017379345315,542198,431166,62787,24076,388
01/07/2017350,660306,437177,209158,63972,36067,784
01/08/2017414,308348,605221,136191,41997,84796,690
01/09/2017520,678454,861276,304242,592155,301140,919
01/10/2017534,746460,559310,969273,286180,672165,424
01/11/2017440,757375,183222,992191,178108,57397,449
01/12/2017385,060325,882298,250196,213111,63099,215
01/01/2018321,560253,513192,655163,57289,56575,444
01/02/2018425,147347,711277,930227,017123,955102,203
01/03/2018443,326374,228221,536213,96298,95985,549
01/04/2018446,530371,819266,409216,622107,63982,419
01/05/2018464,753399,163320,163272,863164,128142,678
01/06/2018455,194388,672348,591298,865218,509188,196

More information

At-a-glance summary

The number of domestic gas and electricity switches generally follows a seasonal pattern (with peaks around March and November then dipping in January and the summer months). Switching has been on the rise since 2014 and the number of domestic switches in the 12 months up to the end of June 2018 was 10% higher than in the 12 preceding months for electricity and 23% higher for gas.

There has been a break in the usual seasonal switching pattern with the number of switches staying at a constant level for each month since February 2018 instead of falling in the summer months.

In June 2018 the proportion of net gains in switching away from the six large suppliers made up 48% of total switches for both gas and electricity, up from 23% in June 2017.

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. For summary information on the switching figures for the year please see also the facts and figures.

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.

As of July 2017, supply points connected to independent gas transporters are included in the gas data provided by Xoserve.

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Chart

Source: Energylinx (Until May 2017) & Energyhelpline (June 2017 onwards).

Information correct as of: August 2018

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. 

From February 2017 the prices shown in the chart are calculated using the new TDCV values that entered into effect from 1st of October 2017 (see the methodology section for more details).

In practical terms, this means that the tariffs offered after February 2017 are likely to appear slightly lower than those before February 2017.  

This information should not be used as a price comparison tool. To find out about accredited price comparison sites, see Compare gas and electricity tariffs.

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)
28/01/20121020.161024.33915.27906.56947.56
28/02/20121000.761017.41886.18878.10930.29
28/03/2012997.251017.41886.18878.10936.54
28/04/2012997.251017.35895.69878.10937.68
28/05/2012997.251017.35895.69878.10929.78
28/06/2012997.251032.16895.69895.69945.53
28/07/2012997.251032.16895.69875.93928.99
28/08/2012997.251030.02899.10875.93924.85
28/09/2012997.251017.84901.47875.93931.04
28/10/20121009.001020.51906.17893.85956.00
28/11/20121030.781075.12958.21909.59997.71
28/12/20121061.801087.65990.70909.59994.59
28/01/20131074.421087.65957.18909.59990.81
28/02/20131074.421119.05957.18909.59994.56
28/03/20131074.421119.05966.54909.59995.50
28/04/20131074.421119.05966.54909.59988.37
28/05/20131074.431119.05966.54962.43997.77
28/06/20131074.431119.05966.54769.95967.26
28/07/20131074.451119.05984.68769.95974.82
28/08/20131074.451119.05971.77769.95988.47
28/09/20131074.451119.05971.77769.95979.55
28/10/20131074.451127.021011.80769.95995.67
28/11/20131105.941123.75993.40769.95992.26
28/12/20131138.951123.751033.47769.95997.00
28/01/20141145.841125.141033.47975.211013.73
28/02/20141134.091128.761033.97966.341014.19
28/03/20141128.101126.611024.79964.311016.25
28/04/20141128.101129.621000.38946.42995.26
28/05/20141128.101129.621000.38944.55995.13
28/06/20141128.101129.621000.38944.55992.88
28/07/20141128.101134.191000.38944.95976.39
28/08/20141128.101127.791000.38943.43978.98
28/09/20141128.101158.39960.90942.27972.34
28/10/20141128.101131.80953.40931.02960.15
28/11/20141128.101131.80921.88914.51947.94
28/12/20141128.101130.51916.21906.14929.69
28/01/20151124.331130.51875.40871.26895.39
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
28/02/20171081.271027.06928.48829.10869.79
28/03/20171109.481035.47922.23829.10873.38
28/04/20171122.281041.56923.55863.31874.62
28/05/20171122.281039.22923.57826.52861.76
28/06/20171122.281026.98923.57835.76852.58
28/07/20171122.281030.63922.82829.91844.94
28/08/20171122.281030.76910.05810.11839.30
28/09/20171134.951026.42904.48826.73837.66
28/10/20171134.951031.41897.98826.73854.69
28/11/20171134.951044.84928.59826.73846.77
28/12/20171134.951040.86973.04798.72841.48
28/01/20181134.951036.14907.89809.32840.81
28/02/20181134.951039.85900.98810.06840.58
28/03/20181134.951044.29900.98810.11842.91
28/04/20181138.281061.811000.42788.16820.46
28/05/20181138.281060.56962.53788.16832.69
28/06/20181172.201066.39953.16796.99845.91
28/07/20181184.791075.35965.27826.73861.22

More information

At-a-glance summary

As of July 2018, the average price of SVTs for the six large suppliers for a typical dual fuel customer paying with direct debit was £1,185, an increase of £13 from the previous month. On the other hand, the average cheapest tariff increased by £30, reaching £827.

As a result, the differential between the average price of SVTs for the six large suppliers and the market cheapest tariff decreased from £375 to £358 between June and July 2018.

SSE raised its SVT tariff on 11 July, which is the reason for the increase in the average price of SVTs for the six large suppliers. Two further price increases took effect in August, by E.ON and EDF, which will be reflected in the next update.

British Gas and ScottishPower have each announced another price rise for customers on both SVT and default fixed tariffs, which will take effect on 1 October 2018 and 8 October 2018, respectively.

Please note that, from 1 April 2018, British Gas’ SVT, which is included in the average SVT price for the six large suppliers, is no longer available to new customers.

For details on prices of fixed default tariffs, please see the chart showing Average tariff prices per supplier.

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 October 2017, typical consumption values for a medium consumer are 12,000kWh/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 licences 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 10 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 10 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

Source: Ofgem analysis of companies’ Consolidated Segmental Statements.

Information correct as of: August 2018

This chart shows the Earnings Before Interest and Tax (EBIT) margins for the generation activities of the six large energy suppliers in the GB market. 

A company’s EBIT margin is their revenue minus their costs, before accounting for taxes and interest. These margins have been divided to highlight variations in profitability for different types of power generation technology.

Policy Areas:

  • Electricity - wholesale markets

Data Table

Large suppliers: Electricity generation profitability by technology type in 2017 (GB)

CompanyNuclearConventionalRenewable
Centrica8.9%1.2%0%
E.ON0%*39.4%
EDF5.3%-21.4%37.3%
RWE0%-2.9%41.1%
ScottishPower0%-1.8%46.2%
SSE0%5.79%53.83%

More information

Electricity generation profitability by technology type: At-a-glance summary

Profitability of electricity generation for the six large suppliers active in the electricity wholesale market can be shown through analysis of their Consolidated Segmental Statements (CSS). There has been a marked reduction in conventional generator profitability in recent years. On the flip side there has been an increase in renewable generation profitability.  

Relevance and further information

The Earnings Before Interest and Tax (EBIT) margin is a useful indicator of trends in energy company profits. The level of profit in a market is a good measure of how competitive that market is. Here we have shown profitability by power generation technology type to indicate which forms of technology generation are most profitable for generators. 

Methodology

EBIT is calculated by subtracting the total direct costs, total indirect costs (such as operating costs) and depreciation and amortisation for supplying energy from a supplier’s total revenue.

The EBIT margin is calculated by dividing a supplier’s total revenue by the EBIT value. It is expressed as a percentage, so the figure is multiplied by 100.

We have split margins into conventional generation (eg coal, gas, oil), renewables (eg wind, hydro) and nuclear.

The data in this chart may differ from the data that can be found in the supplier’s externally published Consolidated Segmental Statements. This is because we have made some adjustments to improve comparability. These mostly relate to removing certain impairment and restructuring costs. Detail on these adjustments can be found in Ofgem's review of 2017 CSS.

Note: Following E.ON’s separation of its fossil fuel generation assets to Uniper in 2016, and subsequent sale of Uniper, the activities of Uniper UK Limited are not included in E.ON’s UK CSS for 2017. As a result, E.ON’s revenues from conventional generation have significantly decreased from 2016 and so have not been included in the chart as they are not directly comparable with the margins for the other Big 6.   

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Chart

Source: Companies' 2016 CSS (adjusted).

Information correct as of: August 2018

The graph and data table show the aggregate profits in £ million across the generation and non-domestic and domestic supply segments from 2009 to 2017.

Policy Areas:

  • Electricity - retail markets
  • Gas - retail markets

Data Table

Aggregate profits of the large energy suppliers: Generation and supply (£ million)

GenerationDomestic supplyNon-domestic supply
20092311221569
20102010769854
20112408681568
201219511190410
201313581151423
20148581160407
201513121022262
201611541032297
2017938924211
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