According to a report in the Express, the reason for the billing inaccuracies is linked to faulty clocks in energy meters. These clocks are not checked by energy suppliers when they take meter readings and it is down to consumers to report any faults.
Customers on a time-of-use tariff are advised to contact their energy supplier if they think their energy meter is not working properly.
Faulty energy meter clocks cause
Economy 7 and Economy 10 energy plans charge different rates per unit of energy, depending on the time of day. Typically energy used during the night is cheaper than that used at peak times during the day.
Faulty clocks within energy meters mean that customers could be charged peak time energy prices for off peak usage.
Problem spotted by retired electrician
Gary Day, a retired engineer, found that his energy meter was behaving erratically and that the clock was sometimes two to three hours off. He had his meter replaced three times and has since begun monitoring it more closely.
He first noticed the issue when he went on holiday and found he had been charged a peak rate per unit, despite programming his heating to come on only at low rate times. Following a complaint to his supplier, Day and his neighbours, who had similar issues, were awarded £2,300.