Energy supplier says it is unrealistic to demand further price cuts after pledge by Ed Miliband to drive down household bills
E.ON has accused the Labour party of undermining confidence in the energy markets after Ed Miliband promised to give powers to the regulator to drive down household bills before the end of this year.
Shares in energy firms fell on Friday as it emerged that the Labour leader was following up his promise of a price freeze with a commitment to make energy suppliers cut their bills by a further £100 per customer.