SunCoke Energy Partners is a master limited partnership formed by its parent and one of the largest coke producers in the Americas SunCoke Energy, Inc. SunCoke Energy Partners was formed in 2012 for the purpose of owning a majority interest in SunCoke Energy's Ohio-based Haverhill and Middletown cokemaking facilities. Today, the partnership owns a 65% interest in each of those facilities, which make metallurgical coke, a raw material used in steelmaking. Together, they have 300 cokemaking ovens with a capacity of 1.7 million tons per year. The company's two main customers are AK Steel and ArcelorMittal USA. SunCoke Energy Partners went public in early 2013 with an offering worth $256.5 million.