The U.S. Energy Department on Thursday offered loan guarantees worth $59 million to two renewable energy companies as the agency tries to quickly boost green energy production with a windfall of funding from the economic stimulus package.

The U.S. Energy Department said on Wednesday it will provide up to $408 million in funding for two projects aimed at developing advanced "clean coal" technologies.

The U.S. climate change bill making its way through Congress is the best legislative bet to help the country take the lead in tackling global warming on the world stage, U.S. Energy Secretary Steven Chu said on Monday.

U.S. lawmakers pushing to include greater recognition for existing nuclear power in a national renewable energy standard failed to win new breaks for the industry when a U.S. congressional panel on Wednesday voted down an amendment to a controversial climate change bill.

The Environmental Protection Agency on Friday unveiled a finding that greenhouse gases endanger human health and welfare, opening the door to federal regulation of carbon dioxide as a pollutant.

The finding does not "automatically trigger" new carbon rules but could allow the EPA to move forward with limiting greenhouse gas emissions under the federal Clean Air Act.

US lawmakers will pass major energy legislation, possibly including measures to address climate change, by the end of this year, a top White House official said on Sunday.

"I do know this, at the end of this first year of Congress there will be an energy bill on the president's desk," White House Chief of Staff Rahm Emanuel told ABC's "This Week with George Stephanopoulos."

The US Environmental Protection Agency said Thursday it is seeking public comment on whether to allow a higher level of ethanol to be blended into gasoline.

Growth Energy and more than 50 ethanol manufacturers petitioned the EPA last month to raise the maximum blend level for ethanol in gasoline from 10 percent to as much as 15 percent.

A portion of the revenue from any U.S. system capping carbon emissions must go toward softening the impact of higher energy prices on consumers, a White House official said on Wednesday.

Joseph Aldy, special assistant to the president for energy and the environment, said building a clean energy economy will not be easy.

U.S. Interior Secretary Ken Salazar said on Thursday he expects his department to finalize rules for offshore renewable energy in a few months.

"I expect that because we have done so much work on these rules that a good time horizon is within the next couple of months that we will have these rules finalized," Salzar told reporters at energy forum.

As the United States' power grid becomes more sophisticated, electricity rates will need to rise to reflect periods of intense energy use and to encourage consumers to change their electricity habits, U.S. Energy Secretary Steven Chu said on Monday.

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