Ofgem said its new rules on fixed term energy deals will give consumers more protection so they have certainty the price and conditions they signed up to will not be altered.
The energy regulator said consumers will not be rolled-over to a new fixed term deal once their contract has ended, "but to a tariff which allows them to switch away without penalty".
Customers will also get over 40 days warning that their fixed deal is coming to an end so they have plenty of opportunity to compare the market and find the best deal for them.
More top news
Australian businessman named as Alan Sugar's newest apprentice and winner of a £250,000 investment in his fledgling company.
The 270 victims of the Lockerbie bombing have been remembered today, 26 years to the day that they lost their lives in the air disaster.
Actress Billie Whitelaw, who starred in films including The Omen, has died aged 82.