see more

Natural gas burns on a kitchen stove in Hornchurch, U.K., on Tuesday, Dec. 4, 2012. The regulatory investigation into alleged manipulation in the U.K. gas market, Europe's biggest, may fail to undermine a price-setting system that relies on daily conversations between journalists and traders. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

Natural gas burns on a kitchen stove in Hornchurch, U.K., on Tuesday, Dec. 4, 2012. The regulatory investigation into alleged manipulation in the U.K. gas market, Europe's biggest, may fail to undermine a price-setting system that relies on daily conversations between journalists and traders. Photographer: Chris Ratcliffe/Bloomberg via Getty Images