And then there was one. After Eon announced on Tuesday that it would increase electricity prices by 9 per cent and gas prices by 3 per cent, that leaves only EDF of the big six who have frozen charges over the winter.
The row that has followed runs along the same lines as that which came after British Gas made a similar announcement last year. The company says wholesale energy prices have risen, but won’t go into detail about their purchasing agreements.
Consumer groups and some analysts argue that companies can and should be more flexible with their supplier agreements to take advantage of low prices when they can. They also say that companies are more reluctant to lower prices when wholesale prices fall than they are to raise them when they rise.
It seems consumers’ best chance of being certain they are getting a fair deal is to hope for decisive action from Ofgem when the regulator announces the results of its probe into energy prices.