Senate Democrats are giving up on plans to pass an energy bill that caps emissions of carbon dioxide, saying Republicans refuse to support the measure.

Senate Majority Leader Harry Reid said no Republican was willing to back a comprehensive energy bill, a development he called "terribly disappointing."

Democrats have been trying for more than a year to pass a plan that charges utilities and other major polluters for their carbon emissions. A compromise plan to limit emissions only from utilities also failed to attract the 60 votes needed to advance it in the 100-member chamber.

Reid and other Democrats said they would focus on a narrower bill that responds to the oil spill in the Gulf of Mexico and improves energy efficiency.