The House of Representatives has approved a $US430 billion ($A605 billion) bill seen as the biggest climate package in US history, delivering a major legislative victory for President Joe Biden ahead of the November 8 midterm elections.
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The legislation to fight climate change and lower prescription drug prices aims to cut domestic greenhouse gas emissions.
It will also allow the negotiation of lower drug prices for the elderly and ensure corporations and the wealthy pay the taxes they owe.
Democrats say it will help combat inflation by reducing the federal deficit.
The House voted 220-207 along party lines to pass the measure and send it on to Biden to sign into law.
The Senate had approved the legislation last Sunday after a marathon, 27-hour session.
Biden said he would sign the bill in the week ahead, then the White House would hold a celebration on September 6 in honour of what he said was historic legislation.
"Today, the American people won. Special interests lost," Biden said in a Twitter post.
Democrats hope the legislation will help them at the polls in November, when voters decide the balance of power in Congress ahead of the 2024 presidential election.
Republicans are favoured to win a majority in the House and could also take control of the Senate.
"It is a resounding victory for America's families," House Speaker Nancy Pelosi declared just before the vote.
Biden plans to travel across the country to tout the bill along with a series of other legislative victories at a time when many voters have soured on him amid soaring inflation.
About half of Americans support the climate and drug pricing legislation, including 69 per cent of Democrats and 34 per cent of Republicans, according to a Reuters/Ipsos poll conducted on August 3 and 4.
Business groups have had a mixed reaction to the legislation, which offers the prospect of higher tax bills for some companies while at the same time giving protections to the fossil-fuel industry.
Republicans oppose the legislation, warning it will kill jobs by raising corporate tax bills, further fuel inflation with government spending and inhibit the development of new drugs.
"Democrats more than any other majority in history are addicted to spending other people's money, regardless of what we as a country can afford," House Republican leader Kevin McCarthy said in a floor speech.
The bill has been more than 18 months in the making.
It represents a final version of Biden's original sweeping Build Back Better plan, which had to be whittled down in the face of opposition from Republicans and key legislators within his own party.
Investors looking to pour cash into clean energy products can expect at least a decade of federal subsidies through long-term tax credits for wind and solar, and new credits for energy storage, biogas and hydrogen.
But the bill does not leave the US fossil-fuel industry in the cold. Provisions allow the federal government to authorise new wind and solar energy developments on federal land only when it is also auctioning rights to drill for oil and natural gas.
The fossil-fuel protections disappointed progressives but posed no barrier to Democratic support.
The bill's main revenue source is a 15 per cent corporate minimum tax aimed at stopping large, profitable companies from gaming the Internal Revenue Service code to slash their tax bills to zero.
Australian Associated Press
