The Executive Director of consumer group Which? says the latest profits show why the Government needs to set up an independent review to look at whether recent price increases are justified.
Richard Lloyd said: "Without greater scrutiny of energy prices, consumers simply will not believe that they're getting a good deal."
More top news
Labour have held onto the crucial seat of Stoke-on-Trent, brushing aside UKIP leader Paul Nuttall in the process.
A highly toxic chemical was used in the death of North Korean leader Kim Jong-un's half brother last week, tests have shown.
A new survey has highlighted the disconnect between people's views on the GB Olympic team and funding for grassroots sport.