The construction boom at the Flint Hills Resources oil refinery in Rosemount is getting a second wind.
The refinery, which has 2,000 temporary employees working on a $400 million upgrade, says it plans to invest an additional $300 million in two new technologies. Those projects will enable the refinery to produce low-sulfur gasoline and a fertilizer byproduct and to generate half its electricity using energy-efficient technology.
Those projects, coming on the heels of the ongoing work, would employ an estimated 1,500 workers through 2016, Scott Lindemann, vice president and manufacturing manager, said in an interview Tuesday. About 20 permanent jobs would be created, he added.
In one project costing about $150 million, Flint Hills said it plans to install a turbine that burns natural gas to generate electricity. The turbine's waste heat would be collected, producing steam to run refinery processes or to boost electrical output using a second, small steam generator.
"Sometimes we need more steam, and we can get more steam," Lindemann said. "If we need less steam, we can turn that into more power generation."
This type of power generation is known as "combined heat and power," and gets high marks for energy efficiency because otherwise wasted heat is recaptured and used. The recaptured heat from power generation reduces the need to operate less-efficient, stand-alone boilers.
Lindemann said the power plant, to be built in the southeast corner of the refinery, would supply about half its power needs. Xcel Energy, based in Minneapolis, would continue to supply the remaining power.
In a second project, Flint Hills said it plans to install new technology, also costing about $150 million, to extract and process sulfur and nitrogen as it begins refining ultra-low-sulfur gasoline to meet stricter Tier 3 U.S. fuel standards in 2017.