Tax credits for clean energy and home energy efficiency would still be phased out, albeit less quickly, under Senate Republicans' latest proposed changes to a massive tax bill. Electric vehicle incentives and other provisions intended to move the United States away from fossil fuels would be gutted rapidly.

U.S. Senate Republicans on Monday proposed a tax bill that would extend a clean fuel tax credit through 2031, but trim 20% of the value of the credit for biofuels made from feedstocks produced outside of the United States.

U.S. solar stocks dropped in premarket trading on Tuesday after a Senate panel proposed a full phase-out of solar and wind energy tax credits by 2028, as part of changes suggested to President Donald Trump's sweeping tax-cut and spending bill.