
an easy way to save money on your utility bills
When comparing suppliers, a common concern is when did a supplier last change their prices.
This table provides details of all movements in prices and the introduction and cessation of tariffs over the last year.
You can see the date the change was added to the calculator and when it became effective.
Date when last update applied: 25th July 2008
| Supplier | Date Updated | Date Effective | Details |
| npower | 25.07.2008 | 25.07.2008 | ONE tariff removed from sale. |
| E.ON | 24.07.2008 | 24.07.2008 | Update of name only: EnergyOnline Extra Saver 7 becomes EnergyOnline Extra Saver 8 |
| E.ON | 22.07.2008 | 22.07.2008 | Removal of Energy Saver v3 and launch of Energy Saver v4 |
| E.ON | 22.07.2008 | 22.07.2008 | Removal of Price Protection v16 and launch of Price Protection v17 |
| Scottish and Southern Energy | 03.07.2008 | 03.07.2008 | New Fixed Discount 2010 product added |
| npower | 30.06.2008 | 30.06.2008 | Removal of Sign Online v11 and launch of Sign Online v12 |
| E.ON | 26.06.2008 | 26.06.2008 | Removal of Energy Saver v2 and launch of Energy Saver v3 |
| E,ON | 26.06.2008 | 26.06.2008 | Removal of Price Protection v15 and launch of Price Protection v16 |
| npower | 22.06.2008 | 22.06.2008 | Removal of Fixed Price 2011 |
| Atlantic Electric and Gas | 12.06.2008 | 12.06.2008 | Removal of all Online tariffs |
| Scottish and Southern Energy | 12.06.2008 | 12.06.2008 | Removal of gas across all S&SE brands as a single fuel product. |
| E.ON | 05.06.2008 | 05.06.2008 | Replacement of EnergyOnline Extra Saver v6 with v7. |
| E.ON | 05.06.2008 | 05.06.2008 | Replacement of ElectricityOnline Extra Saver v6 with v7.and launching EnergyOnline Extra Saver V7 (SC and NSC) and ElectricityOnline Extra Saver V7 |
| ScottishPower | 05.06.2008 | 05.06.2008 | Launch of pre-registration facility for Fixed Price 2009 tariffs. |
| E.ON | 02.06.2008 | 02.06.2008 | Replacement of Energy Saver V1 and Price Protection V14 with Energy Saver V2 and Price Protection V15 respectively. |
| Utilita | 01.06.2008 | 01.06.2008 | Removal of one of the discounts on the energy saver tariff. |
| British Gas | 30.05.2008 | 30.05.2008 | Click Energy 5 - reduction in gas prices |
| npower | 29.05.2008 | 29.05.2008 | SOL v11 - electricity prices reduced for standard customers. |
| British Gas | 19.05.2008 | 19.05.2008 | Launch of Price Guarantee December 2009. |
| ScottishPower | 17.05.2008 | 17.05.2008 | Removal of all fixed price tariffs from sale to new customers. |
| E.ON | 08.05.2008 | 08.05.2008 | v4 of the Guarantee range of tariffs replaced with v5. |
| EDF Energy | 07.05.2008 | 07.05.2008 | Removal of Fixed Price 2009 tariffs from sale. |
| British Gas | 02.05.2008 | 02.05.2008 | Price Protection 2009 removed from sale |
| British Gas | 02.05.2008 | 02.05.2008 | Click Energy 5 electricity prices reduced. Effective existing customers 8th May 2008 |
| Green Energy | 01.05.2008 | 01.05.2008 | Launch of Pale Green and Deep Green Energy tariffs. |
| Spark Energy | 01.05.2008 | 01.05.2008 | Launch of new standard prices |
| npower | 28.04.2008 | 28.04.2008 | Removal of Sign on Line 10 and launch of Sign On Line 11 |
| npower | 14.04.2008 | 14.04.2008 | Introduction of discounts for quarterly direct debit customers. |
| npower | 14.04.2008 | 14.04.2008 | Launch of the ONE tariff for dual fuel customers |
| Spark Energy | 02.04.2008 | 02.04.2008 | Removal of all discounted tariffs from sale. |
| Telecom Plus | 01.04.2008 | 01.04.2008 | Updated electricity prices |
| Ecotricity | 01.04.2008 | 01.04.2008 | Updated prices in three distribution areas |
| EBICo | 28.03.2008 | 28.03.2008 | Gas prices increased by 12.09% and electricity prices increased by an average of 14.84% |
| Scottish and Southern Energy | 20.03.2008 | 20.03.2008 | Gas prices increased by 15.8% and electricity prices by 14.2% |
| E.ON Energy | 18.03.2008 | 18.03.2008 | Removal of EnergyOnline Extra Saver 5 and replacement with EnergyOnline Extra Saver 6 |
| EDF Energy | 04.03.2008 | 04.03.2008 | Removal of Energy Online v5.1 |
| British Gas | 04.03.2008 | 04.03.2008 | Update of Market Tracker rates in accordance with the tariff rules |
| npower | 18.02.2007 | 18.02.2008 | Sign Online version 9 removed from sale and replaced with Sign Online version 10 |
| ScottishPower | 11.02.2008 | 11.02.2008 | Removal of Online Energy Saver 4 and Online Energy Saver Green Fund as an available tariff. |
| British Gas | 08.02.2008 | 08.02.2008 | Click Energy 4 withdrawn and replaced with Click Energy 5 |
| E.ON | 07.02.2008 | 07.02.2008 | Launch of EnergyOnline Extra Saver V5 tariffs. |
| ScottishPower | 01.02.2008 | 02.02.2008 | Launch of new Fixed Price tariff, fixed to 28th February 2011 |
| ScottishPower | 01.02.2008 | 02.02.2008 | Increase in standard gas prices by 15% and standard electricity prices by 14% |
| Union Energy | 02.02.2008 | 02.02.2008 | Gas and electricity prices on average by 14% |
| Good Energy | 28.01.2008 | 01.02.2008 | New tariffs released, average increase 13.2% |
| Telecom Plus | 01.02.2008 | 01.02.2008 | Gas prices increased by an average of 12% and electricity prices by an average of 7% |
| Scottish Power | 24.01.2008 | 24.01.2008 | Launch of Discounted Energy tariff as a dual fuel and electricity only tariff. |
| Sainsbury's Energy | 15.01.2008 | 18.01.2008 | Gas and electricity prices increased by 12.9% |
| EDF Energy | 18.01.2008 | 18.01.2008 | Online Energy v1.6, v2.4, v3.4 and v4.4 updated |
| British Gas | 18.01.2008 | 18.01.2008 | Gas and electricity prices increased by 15% |
| British Gas | 21.01.2008 | 18.01.2008 | Launch of Price Protection February 2009 |
| EDF Energy | 15.01.2008 | 15.01.2008 | Standard gas and electricity prices increased by 12.9% and 7.9% respectively. |
| Ecotricity | 14.01.2008 | 14.01.2008 | New prices launched for New Energy and New Energy plus |
| E.ON | 09.01.2008 | 09.01.2008 | Launch of EnergyOnline Extra Saver 4, ElectricityOnline Extra Saver 4 and EnergyOnline Extra Saver Standing Charge 4 - all with an extra saver discount until at least 1 April 2009 |
| ScottishPower | 08.01.2008 | 08.01.2008 | Removal of PriceFall tariffs as customer allocation now complete. |
| npower | 05.01.2008 | 05.01.2008 | All standard prices increased on average by 17.2% for gas and 12.7% for electricity |
| npower | 05.01.2008 | 05.01.2008 | Price Fix 2011 launched for dual fuel and electricity only. |
| E.ON | 03.01.2008 | 03.01.2008 | Reduction in the surcharge applicable to prepayment gas age concern and standard customers effective immediately for new customers and from 08.01.2008 for existing. |
| Good Energy | 03.01.2008 | 03.01.2008 | Decision taken to no longer supply customers with a pre-payment tariff. |
| Southern Electric | 28.12.2007 | 28.12.2007 | Removal of Price Fix 2008 On-line tariff for new customers. |
| SWALEC | 28.12.2007 | 28.12.2007 | Removal of Price Fix 2008 On-line tariff for new customers. |
| Scottish Hydro-Electric | 28.12.2007 | 28.12.2007 | Removal of Price Fix 2008 On-line tariff for new customers. |
| E.ON | 20.12.2007 | 20.12.2007 | Fiex Price 2009 removed from sale. |
| E.ON | 18.12.2007 | 18.12.2007 | Energy Guarantee v4 launched as a dual fuel tariff. |
| E.ON | 18.12.2007 | 18.12.2007 | Electricity Guarantee v4 and Gas Guarantee v4 launched as single fuel tariffs. |
| npower | 17.12.2007 | 17.12.2007 | Sign Online v9 launched and Sign Online v8 withdrawn from sale. |
| ScottishPower | 06.12.2007 | 06.12.2007 | Removal of Marks and Spencer voucher offer from Online Energy Saver 4 |
| Green Energy UK | 05.12.2007 | 05.12.2007 | Prices of Green Energy 100 and Green Energy +10 reduced |
| Powergen | 05.12.2007 | 05.12.2007 | Launch of Price Protection V13 as a capped price dual fuel and electric only tariff. Capped to 1st October 2009. |
| British Gas | 04.12.2007 | 04.12.2007 | Update of Market Tracker rates in accordance with the tariff rules |
| Spark Energy | 01.12.2007 | 01.12.2007 | Launch of Direct Discount tariff for gas, electricity and dual fuel. |
| Southern Electric | 12.11.2007 | 12.11.2007 | Launch of better plan tariff. |
| Scottish Hydro Electric | 12.11.2007 | 12.11.2007 | Launch of better plan tariff. |
| SWALEC | 12.11.2007 | 12.11.2007 | Launch of better plan tariff. |
| Utilita | 01.09.2007 | 01.11.2007 | New prices for all tariffs, effective for new customers immediately. |
| Spark Energy | 22.10.2007 | 22.10.2007 | Two new discounted tariffs launched. |
| Spark Energy | 11.10.2007 | 11.10.2007 | Reduction in both gas and electricity prices |
| Scottish and Southern Energy | 09.10.2007 | 09.10.2007 | Update of Price Fix 2008 Internet tariffs across all areas. Average reduction of 1.2% applies to new and existing customers. |
| British Gas | 09.10.2007 | 09.10.2007 | Update of Click Energy 4 prices. |
| Powergen | 08.10.2007 | 08.10.2007 | Electricity Guarantee v3 and Gas Guarantee v3 launched as single fuel tariffs. |