OMAHA, Neb. (AP) — Nebraska utilities might be forced to make expensive changes to comply with new proposed restrictions on carbon dioxide emissions because they rely heavily on coal power.

But utility and state officials said Monday the potential impact of the new rules won’t be clear until after they’ve had a chance to study the details.

The plan calls for Nebraska to reduce its carbon emissions by 26 percent by 2030. That’s less than the 30 percent reduction nationwide the Obama administration is seeking, but it’s still ambitious.

Troy Bredenkamp with the Nebraska Rural Electric Association says the rules will likely require some expensive updates.

But he hopes the state will be able to comply without drastic changes because it does get a significant amount of its electricity from nuclear and hydropower.