ITV News Economic Editor Richard Edgar has tweeted:
Eon feels the heat as it's fined £12 million by the regulator for misselling contracts as recently as December last year.
Eon will pay its vulnerable customers (who get Warm Home Discount) about £35 each - there are about 1/3 of a million of them
Eon misled customers and its management failed to put checks in place to stop this.
E.ON has said it will compensate customers it may have mis-sold to. Find out how to make a claim.
E.ON boss Tony Cocker has apologised after the energy firm was found to be misleading customers, according to an investigation by Ofgem.