RALEIGH, N.C. (AP) — The North Carolina Senate gave preliminary approval Tuesday to legislation ordering Duke Energy to close all of its coal ash dumps in the state by 2029.

The unanimous vote came about four months after a massive spill from a Duke plant in Eden coated 70 miles of the Dan River in toxic gray sludge. The measure backed by Senate Leader Phil Berger, R-Rockingham, and Senate Rules Chairman Tom Apodaca, R-Henderson, requires Duke to place ash from dumps at four of its plants into lined landfills or sell it for reuse by the construction industry within five years.