WASHINGTON (AP) — Senate Republicans blocked a proposal yesterday to tax the windfall profits of the largest oil companies, despite pleas by Democratic leaders to use the measure to address America's anger over $4 a gallon gasoline.

The Democratic energy package would have imposed a tax on any "unreasonable" profits of the five largest US oil companies and given the federal government more power to address oil market speculation that the bill's supporters argue has added to the crude oil price surge.

"Americans are furious about what's going on," declared Sen. Byron Dorgan (Democrat, North Dakota), and want Congress to do something about oil company profits and "an orgy of speculation" on oil markets.

But Republicans argued the Democratic proposal focusing on new oil industry taxes is not the answer to the country's energy problems.

"The American people are clamouring for relief at the pump," said Sen. Pete Domenici (Republican, New Mexico), but if taxes are increased on the oil companies "they will get exactly what they don't want. The bill will raise taxes, increase imports."

The Democrats failed, 51-43, to get the 60 votes needed to overcome a GOP filibuster and bring the energy package up for consideration.

Separately, Democrats also failed to get Republican support for a proposal to extend tax breaks for wind, solar and other alternative energy development, and for the promotion of energy efficiency and conservation. The tax breaks have either expired or are scheduled to end this year.

The tax provisions were included in a broader $50 billion tax measure blocked by a GOP filibuster threat. A vote to take up the measure was 50-44, short of the 60 votes needed.

The windfall profits bill would have imposed a 25-percent tax on profits over what would be determined "reasonable" when compared to profits several years ago. The oil companies could have avoided the tax if they invested the money in alternative energy projects or refinery expansion. It also would have rescinded oil company tax breaks — worth $17 billion over the next 10 years — with the revenue to be used for tax incentives to producers of wind, solar and other alternative energy sources as well as for energy conservation.