North American iron-ore products producer Cliffs Natural Resources has secured a new 20-year energy agreement with fellow NYSE-listed WEC Energy Group to provide the company’s core Tilden mine with a long-term, reliable and affordable source of electric power in Michigan. “Our Tilden Mine produces among the highest quality pellets in North America. With a stable, long-term source of power in place, Tilden will also continue to be the most operationally efficient producer of pellets for the domestic steel industry,” advised Cliffs CEO Lourenco Goncalves.