This case study looks at the results of a DOE energy assessment at U.S. Steel’s Minntac plant in Mt. Iron, Minnesota, to analyze the efficiency of the plant’s process heating systems and determine energy savings opportunities. The assessment confirmed the energy savings from recently installed burners and determined the potential savings from retrofitting the kilns in the plant's other process lines with such burner systems. The new burners are yielding annual cost and energy savings of $760,000 and 95,000 MMBtu respectively. Additionally, the plant saves $30,000 in annual maintenance labor costs. With project costs of approximately $1.2 million, the plant achieved a simple payback of 1.5 years.