E.ON (EOAN.XE) shares swing briefly into positive territory in an overall negative market. E.ON's move follows approval by the European Parliament of backloading CO2 emission permits, which should benefit the German company, a trader says. Backloading [delayed auctioning of emission rights] is expected to reduce supply and increase prices of CO2 allowances, which in turn is meant to incentivize investment in "cleaner" power generation technologies. 
E.ON has heavy exposure to gas-fired power generation, which emits less CO2 than coal plants. Utility shares are generally oversold, hovering at around all-time-lows, the trader says, with low power prices weighing earnings prospects. E.ON shares dipping back now, down 0.9% at EUR12.07.