President Donald Trump signed four executive orders to overhaul the Nuclear Regulatory Commission and hasten the process and deployment of new nuclear power reactors in the United States.

Trump declared a national energy emergency on day one, responding to the first major U.S. power demand surge in decades.

Shares in companies tied to nuclear power jumped Friday, helped by President Donald Trump’s rollout of four executive orders that aim to provide a boost to the sector, but there were concerns about whether there could be much of a near-term impact.

Constellation Energy, the largest nuclear operator in the U.S., rose by 3% by Friday afternoon, while shares of uranium mining firms Uranium Energy (23%), Energy Fuels (17%), Cameco Corp. (9.5%) and Centrus Energy (22%) also spiked in value.

The House narrowly passed its massive GOP tax and spending cuts package on Thursday, sending President Donald Trump’s “one big, beautiful bill” over to the Senate, where it will likely face many changes.