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Despite huge falls in the cost to companies of buying both gas and electricity over the last year, Telecom Plus, which provides gas and electricity under the Utility Warehouse brand, increased its electricity prices in some regions by up to 7 per cent on Tuesday. The move went unnoticed because the previous day, the last of the 'big six' energy companies, Scottish Power and EDF Energy, had announced their long-awaited price cuts, which are to take effect on 15 June.
'While EDF Energy and, previously, npower have come in for much justified criticism for not cutting their electricity prices for their most loyal electricity customers, Telecom Plus has cynically taken advantage of the confusion over prices to actually increase its electricity prices for certain customers,' says Joe Malinowski of price comparison website Theenergyshop.com
'Overall we have reduced gas and electricity prices significantly across the country, but there are one or two regional exceptions to this where we hadn't put our prices up as much as others did previously,' says Charles Wigoder, chief executive of Telecom Plus.
EDF, meanwhile, said last week it would reduce the cost of gas for direct-debit customers by up to 10 per cent, while its electricity prices would remain unchanged. Scottish Power will cut gas prices.....continued below
Meanwhile, wholesale gas and electricity prices - the prices the suppliers themselves pay - have fallen by up to 60 per cent since last May.
'It is now more important than ever to compare energy prices because, with this round of price cuts, it's difficult to know how the individual customer has been affected,' says Malinowski. 'We expect another round of cuts towards the end of this year. However, if recent experience is anything to go by, it could be a while coming and may disappoint again.'
Mark Todd, head of energy at comparison website Energyhelpline.com says people should look carefully at all the tariffs available from a supplier before switching: 'It is the discounted and online tariffs now where the real price cuts have kicked in. People should switch to one of these if they want the maximum benefits of the drop in wholesale prices.'
Most companies now offer cheaper tariffs via their websites, and bills are, on average, £80 a year lower on these than on standard tariffs from the same company. British Gas's online Click Energy 2 tariff is still, on average, the cheapest deal in the market, although as of last week in certain regions it has been overtaken by new entrant Utilita.
Good value offline tariffs include EnergySaver from Utilita and npower's Sign On Line. The npower tariff requires you to sign up online, but you can then manage it offline in the traditional way.
Some companies make it even harder for existing customers to benefit. Npower customers who would like to be on the Sign On Line tariff first have to switch away from the company to a rival supplier and then switch back to the cheaper deal. And most online tariffs are not available to those who do not want to pay by monthly direct debit.
So how do you work out the best supplier for you? The headline figures on electricity price cuts can be misleading as there are huge variations regionally.
How much you pay for your energy is worked out on a number of factors, including postcode, usage and payment method. Price comparison websites take all three factors into account and therefore remain the easiest way to get the cheapest deal. But try several comparisons across a number of rival sites before switching. All the switching websites told us most customers would be better off signing up to a dual-fuel deal - and so most switching websites show these results first. Yet The Observer found cheaper deals by getting electricity and gas from separate suppliers.
Using a London postcode, we posed as a customer paying £40 a month for gas and £20 a month for electricity, both through EDF Energy on its standard tariff, and paying by monthly direct debit. Uswitch.com Simplyswitch.com and Energyhelpline.com all came up with an annual dual-fuel energy bill of around £600 using either Scottish Power or British Gas as the cheapest alternative. Yet all three sites came up with savings of between £10 and £20 a year over the dual-fuel option if we took our gas from Atlantic and our electricity supply from British Gas.
Another factor to bear in mind is customer service. British Gas may be the cheapest online supplier but it has also received the highest number of complaints. You can find out how many complaints each supplier has received at the website of consumer watchdog Energywatch. Look under the 'help and advice' section at www.energywatch.org.uk.
The biggest beneficiaries of switching suppliers will be those who are coming to the end of a year-long fixed-term contract. 'If you fixed your price at any time from February last year, you will not have seen any of the benefits of a falling market,' says Malinowski, who adds that people in this position could save up to £250 a year by changing suppliers.
Guardian Unlimited © Guardian News and Media Limited 2006