As TIME reported on Monday, President Trump will be slapping tariffs on imported solar panels.

In October, the US International Trade Commission recommended a 35% tariff on solar panels, concluding that the access to cheap imported panels are hurting US manufacturers. Taking the panel’s advise, Trump opted to institute a 30% tax on imported solar panels.

As TIME reported, “The first 2.5 gigawatts of imported solar cells will be exempt from the tariffs, Trump said in a statement Monday. The president approved four years of tariffs that start at 30 percent in the first year and gradually drop to 15 percent.”