| Company | Price Change Details | Effective Date |
| Scottish and Southern Group (SSE) | Gas price reduction | 29/03/10 |
| first:utility | Launch of new iSave and Smart Online Saver tariffs | 01/03/10 |
| Ofgem | Launch of new Green Energy kitemark accreditation scheme | 09/02/10 |
| British Gas | 7 % Gas price reduction | 04/02/10 |
| ScottishPower | Select Price reduction Online Energy Saver v8 | 05/01/10 |
| EDF Energy | Introduction of Online Energy Saver v5 | 04/01/10 |
| Atlantic Electric and Gas | Price reduction for Online Fixed Price tariff | 29/12/09 |
| ScottishPower | Online Energy v7 becomes v8 | 16/12/09 |
| npower | Introduction of Sign Online v17 | 14/12/09 |
| British Gas | Introduction of Web Saver 5 | 10/12/09 |
| first:utility | New Smart Energy offer for the Midlands region | 09/12/09 |
| EDF Energy | Launch of Online Saver v4 with GBP 30 REWARD | 20/11/09 |
| ScottishPower | GBP30 cashback offer for ScottishPower Online Energy Saver 7 | 12/11/09 |
| ScottishPower | Price Reduction for Online Energy Saver 7 | 23/10/09 |
| Ovo Energy | Introduction of New Energy v2 | 22/10/09 |
| npower | Introduction of Go Fix v1 | 19/10/09 |
| EDF Energy | Introduction of Annual Fix v4 tariff | 12/10/09 |
| Not your average Friday. An Energy Price War has broken out! | E-ON, first:utility and ScottishPower are cutting deep into their discounted offering | 02/10/09 |
| E.ON | Launch of WinterGas | 28/09/09 |
| ScottishPower | Introduction of new Online Energy version7 | 25/09/09 |
| first:utility | introduction of cheap iSave tariff | 10/09/09 |
| E.ON | E.ON goes one better with Fix Online v3 - a fixed price discount tariff | 21/08/09 |
| EDF Energy | EDF releases its cheapest Online Tariff for wide distribution - short term offer only! | 17/08/09 |
| first:utility | first:utility relaunches with market leading smart tariff in Midlands and East Midlands | 14/08/09 |
| E.ON | Save Online v1 takes top slot | 05/08/09 |
| npower | npower releases new discount tariff, Sign Online version 16 | 19/07/09 |
| ScottishPower | Introduction of Online Energy Saver 6 | 16/07/09 |
| E.ON | -3% on gas | 03/07/09 |
| Brittish Gas | -10 % electricity cut on the standard rate tariff | 07/05/09 |
| ScottishPower | Gas price cut of 7.5% electricity down by 3% | 31/03/09 |
| E.ON | -9% electricity only | 31/03/09 |
| EDF Energy | -8.8% tariff reduction for electricity only | 31/03/09 |
| npower | -8% electricity only | 31/03/09 |
| Scottish and Southern Energy | Scottish and Southern Energy to modestly reduce gas and electricity prices after the winter | 30/03/09 |
| British Gas | Gas price cut of 10% | 19/02/09 |
| British Gas | Introduction of Web Saver 2 and PRice Guarantee 2010 | 19/02/09 |
| EDF Energy | New Annual Fix 2009 pricefreeze tariff, version 2 | 09/02/09 |
| EDF Energy | New Annual Fix 2009 pricefreeze tariff | 19/01/09 |
| ScottishPower | Fixed Price adjustment of 10% | 05/01/09 |
| Scottish and Southern Energy, British Gas, npower | decrease in Prepayment prices | 03/12/08 |
| ScottishPower | Intrroduction of new Capped and Fixed Price tariffs | 01/12/08 |
| npower | Launch of new and cheaper version of Sign Online discount offer | 03/11/08 |
| ScottishPower | +34,4% gas, +9.4% electricity | 01/09/08 |
| npower | +26% gas, +14% electricity | 29/08/08 |
| ScottishPower | Price Reduction for Price Fix October 2009 | 21/08/08 |
| E.ON | +26% gas, +16% electricity | 21/08/08 |
| Scottish and Southern Energy | +29.2% gas, + 19.2% electricity | 21/08/08 |
| British Gas | effective withdrawal of Click Energy 5 tariff | 15/08/08 |
| ScottishPower | ScottishPower reintroduces Capped Rate | 11/08/08 |
| British Gas | effective withdrawal of Fixed Price 2011 capped tariff | 08/08/08 |
| British Gas | +35% gas, +9% electricity | 30/07/08 |
| ScottishPower | Withdrawal of PriceGuarantee tariff | 29/07/08 |
| EDF Energy | +22% gas, + 17% electricity | 25/07/08 |
| E.ON | Replacement of Pricefreeze tariffs | 22/07/08 |
| npower | withdrawal of npower Price Fix 2011 | 21/06/08 |
| Scottish and Southern Energy | Immediate withdrawal of Internet tariff | 12/06/08 |
| British Gas | +15% on Gas and Electricity Market Tracker tariff rates | 03/06/08 |
| British Gas | ClickEnergy5 - 4.5% electricity | 01/05/08 |
| npower | launch of npower One tariff with inclusive boiler insurance | 14/04/08 |
| E.ON | Introduction of new capped price tariff with free energy monitor | 14/04/08 |
| Scottish and Southern Energy | +14.2% electricity, +15.8% gas | 01/04/08 |
| Telecom Plus (Utility Warehouse) | +4% on electricity, gas unchanged | 01/04/08 |
| Good Energy | 2nd price decrease announced | 19/03/08 |
| E.ON | Replacement of Extra Saver version 5 | 18/03/08 |
| npower | Introduction of new Price Fix 2011 tariff | 03/03/08 |
| British Gas | Replacement of Click Energy 4 with Click Energy 5 | 11/02/08 |
| E.ON (formerly Powergen) | +9% electricity, +15% gas | 07/02/08 |
| Utilita | +15% gas, +10% electricity | 01/02/08 |
| ScottishPower | +14% electricity, +15% gas | 01/02/08 |
| Telecom Plus (Utility Warehouse) | General Price Increase | 01/02/08 |
| EDF Energy | Electricity +7.9%, gas +12.9%. | 18/01/08 |
| British Gas | +15% gas, +15% electricity | 18/01/08 |
| British Gas | British Gas introduces new Capped Price tariff | 17/01/08 |
| ScottishPower | ScottishPower withdraws PriceFall tariff | 09/01/08 |
| npower | +17% gas, + 13% electricity | 05/01/08 |
| British Gas | Market Tracker tariff +13%, +17% electricity | 04/12/07 |
| Scottish and Southern Energy | better plan green tariff launches | 12/11/07 |
| Utilita | +5% on electricity, -2% on gas | 01/11/07 |
| Powergen | Relaunch of EnergyGuarantee Tariff | 08/10/07 |
| Scottish and Southern Energy | Introduction of Price Fix 2008 Product | 28/09/07 |
| British Gas | Introduction of Click Energy version 4 Discount tariff | 28/09/07 |
| British Gas | Introduction of Priority Response Tariff | 24/09/07 |
| British Gas | Market Tracker tariff launches | 01/09/07 |
| Scottish and Southern Energy | Launch of new Energy Online Tariff | 31/08/07 |
| npower | Launch of Sign Online, version 8 | 24/08/07 |
| British Gas | British Gas launches Zero Carbon Green tariff | 01/08/07 |
| Powergen | Powergen introduces new version of Energy Online tariff | 13/07/07 |
| ScottishPower | ScottishPower launches new Green Online tariff | 05/07/07 |
| EDF Energy | -10% on standard gas tariff only | 15/06/07 |
| ScottishPower | -11% gas, -5.5% electricity price decrease | 15/06/07 |
| ScottishPower | ScottishPower launches new Online offer | 08/06/07 |
| Powergen | Powergen introduces Go Green tariff | 16/05/07 |
| British Gas | British Gas migrates Discounted Electricity customers onto Standard rates | 11/05/07 |
| utilita | utilita introduces £15 Loyalty discount for energysaver dual fuel customers and introduces tariffs across all of Great Britain | 01/05/07 |
| Powergen | -16% gas, -5% electricity | 30/04/07 |
| Powergen | New EnergyOnline Prices for existing customers | 30/04/07 |
| British Gas | -3% gas, -6% electricity | 27/04/07 |
| Powergen | Powergen Guarantee further price cut to match British Gas | 27/04/07 |
| ScottishPower | Launch of Online Energy Saver 3 | 20/03/07 |
| British Gas | British Gas further reduces the cost of Click Energy 2 | 02/03/07 |
| EDF Energy | EDF Energy reintroduces Online Energy discount tariff in most UK regions | 01/03/07 |
| Scottish and Southern Energy | -12% gas, -5% electricity | 01/03/07 |
| Utilita | Utilita relaunches with energysaver and planetsaver | 21/02/07 |
| npower | npower adds £20 to its Dual Fuel discount | 19/02/07 |
| Powergen | Discount Increase Energy Online Extra Saver | 15/02/07 |
| British Gas | -17% gas, -11% electricity | 12/02/07 |
| npower | npower rolls back the price of energy for new customers | 31/01/07 |
| Scottish and Southern Energy | Scottish and Southern increase prompt payment discount | 16/01/07 |
| EDF Energy | EDF Energy reintroduces Online Energy discount tariff in the Southern region | 05/01/07 |
| Atlantic Electric and Gas, Southern Electric, Scottish Hydro and SWALEC | +12.2% increase in gas, +9.4 % average price increase electricity | 01/01/07 |
| ScottishPower | ScottishPower increases its Online Discount | 14/12/06 |
| British Gas | Replacement of Click Energy discount plan with more expensive version as of Jan 8th, 2007 | 06/12/06 |
| npower | Introduction of new version of Sign Online tariff | 23/10/06 |
| British Gas | Introduction of new Fix n' Fall tariff | 16/10/06 |
| npower | +17% increase on standard gas, +9.9% on standard electricity | 01/10/06 |
| Telecom Plus (Utility Warehouse) | +11% average increase on gas and electricity | 01/10/06 |
| EDF Energy | Unpublished price increase for EDF Energy ONLINE customers | 01/10/06 |
| npower | Sign Onlne unpublished price increase for Sign Online tariff versions SOL1 to SOL5 | 01/10/06 |
| ecotricity | electricity price increase in Powergen regions | 20/09/06 |
| British Gas | +12% on standard gas, + 9% increase on standard electricity | 04/09/06 |
| EBICo | +31% for gas and +21% for standard electricity | 01/09/06 |
| Countrywide Energy | + 13% gas price increase | 01/09/06 |
| Telecom Plus (Utility Warehouse) | +11% increase on gas and electricity | 01/09/06 |
| npower | regional electricity price REDUCTIONS on npower Sign Online discount tariff | 25/08/06 |
| Powergen | +9.7% on electricity and +18.4% on gas | 21/08/06 |
| ecotricity | Price increase on electricity prices. | 18/08/06 |
| ScottishPower and Manweb | From August 8th, ScottishPower will accept higher usage customers only. | 07/08/06 |
| ScottishPower and Manweb | ScotttishPower will withdraw the current version of its Capped price from signup. | 04/08/06 |
| EDF Energy | +8% on standard electricity, +19% on standard gas. | 31/07/06 |
| ScottishPower and Manweb | 10% on electricity and +17% on gas. | 10/07/06 |
| Powergen | New electricity-only online tariff introduced. | 06/07/06 |
| ScottishPower and Manweb | From June 10th, ScottishPower will accept new customers. | 10/06/06 |
| Powergen | New prices for EnergyOnline Dual Fuel tariff. | 09/06/06 |
| Telecom Plus (Utility Warehouse) | +9% on electricity, +10% on gas. | 01/05/06 |
| Atlantic Electric and Gas, Southern Electric, Scottish Hydro and SWALEC | Electricity increase by 9.4% and gas prices by 16.5%. | 01/05/06 |