Gas and electricity Updated:
The big six energy firms in the UK have agreed a deal to let their customers know the best deals for them, it has been announced.
EDF, E.On, British Gas, Southern Electric, Scottish Power and Npower - who supply 99% of British homes with energy - will now write to customers every year to specifically tell them what the best tariff is for them and how to get it.
Customers will also be contacted when their contracts are coming to an end, or if they contact their provider at any time.
Some vulnerable customers - those assisted by the Warm Home Discount scheme - will be contacted twice a year.
However, firms will not have to tell customers if they can get cheaper deals elsewhere, meaning people should continue to shop around for the best deal.
Announcing the agreement, Deputy Prime Minister Nick Clegg said families could save up to £100 a year.
"We need to get bills as low as possible. I know that many families are struggling with rising energy bills. We can't control volatile world energy prices. But we can still help people get their bills down," he said.
"So I can announce today that we have secured a landmark deal with the six big energy companies who cover 99% of customers, to give customers a guaranteed offer of the best tariff for them."
The Deputy PM also revealed that work is being done with energy firms to put barcodes on energy bills, which will allow customers to use their smartphones to check whether they're on the best tariffs or switch providers.
Figures show that there are more than 120 different tariffs, with seven out of 10 people on the wrong tariff for them.
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