Ofgem has announced plans to force energy firms to be more transparent about their finances.
Millions of households could be out of pocket after a clock error was discovered on some electricity meters.
British Gas owners Centrica have announced a £571 million profit from its residential energy arm in 2013 - 6% less than the £606 million haul in 2012.
Four of the Big Six energy companies are to start giving their customers automatic refunds by direct debit when they are in credit.
Consumers are being misled after research found one in five household products do not match their energy-efficiency claims, according to the Energy Saving Trust.
A small energy firm is bidding to win more customers from the so-called Big Six after unveiling a 2.5% cut in prices.
Consumer group Which? has demanded an inquiry into competition in the energy market, saying the current system is "not working for customers".
Annual water and sewerage bills are to rise by an average of 2% - or £8 - from April, industry body Water UK has said.
Energy watchdog Ofgem is being urged to probe the gas profit margins of the Big Six energy firms.
MPs have called for energy companies to limit the charges imposed on customers who do not pay by direct debit.
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