Mainers voted decisively Tuesday to kill a $1 billion transmission line project in the western part of the state in a vote that was fueled in part by distaste for the state’s largest utility and concerns about environmental impacts to the North Woods.

With 450 of 571 precincts reporting, 59 percent of voters had said “yes” to Question 1, a strong repudiation of Central Maine Power Co., its domestic parent company Avangrid and Canadian energy supplier Hydro-Quebec, as well as plans to finish the New England Clean Energy Connect project and put it into service. The “yes” vote registered a strong showing in nearly every part of the state except Aroostook County as of 12 a.m.