The U.S. House of Representatives has passed H.R. 4503, a comprehensive energy bill. The legislation is similar to a bill that last year passed in the House, but failed in the Senate. In order to become law, the bill must gain approval from the Senate, where energy legislation continues to be stalled.Meanwhile, House and Senate conferees will begin meeting on an export tax bill, which could result in the adoption of tax credits for the purchase of fuel cell, hybrid, or other alternative fuel motor vehicles. The Senate bill (S.1637) includes the energy incentives, but the House version (H.R. 4520) does not.