Price-fixing claims like these highlight the urgent need to overhaul our energy system to make it clearer, fairer and cleaner.
Friends of the Earth raised concerns over our broken energy market a year ago and called for a public inquiry, which the Government turned down. We're reiterating that call today.
Britain's heavy reliance on imported gas for our electricity is driving up fuel bills - and the Chancellor's reckless dash for gas will make matters worse.
With the Energy Bill expected next week, ministers must seize the chance to end the nation's gas dependency and open up the market to a wider range of smaller firms generating affordable and clean British energy.
A former energy trader has told ITV News the electricity market has been rigged and it is "worse" than the gas market.
Another market, another investigation. The Energy and City watchdogs start investigations into allegations of traders fixing the gas price.