E.On Next, Good Energy and Octopus Energy have paid £8m over compensation failures after lengthy delays in producing final bills to more than 100,000 customers when they switched suppliers, regulator Ofgem said.
The energy watchdog said the three suppliers either missed or delayed compensation payouts that were due when they did not provide a final bill within six weeks, as required when a customer switches to another provider.
Under rules brought in three years ago, customers are entitled to a £30 payment each if a final bill is not produced in six weeks, with a further £30 due if the compensation is not provided within another 10 working days.