The Senate version of the bill includes a provision that would fully phase out both solar and wind power tax incentives by 2028. It does, however, keep incentives for nuclear, hydropower and geothermal energy for longer.

(Reuters) -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.

Shares of U.S. solar energy companies tumbled in extended trade on Monday after Republicans who control the U.S. Senate Finance Committee unveiled changes to President Donald Trump's sweeping tax-cut and spending bill that would phase out solar,