Nucor Corp., which has been increasingly interested in sustainable energy resources, has about two dozen scrap-based steel mills in the United States. All operate with electric-arc furnaces, making energy one of its largest expenses.

Nucor Corp., which has been increasingly interested in sustainable energy resources, has about two dozen scrap-based steel mills in the United States. All operate with electric-arc furnaces, making energy one of its largest expenses. Read MoreCharlotte Business News – Local Charlotte News | Charlotte Business Journal