President Donald Trump signed a series of executive orders Friday aimed at speeding the development and deployment of nuclear power.

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.