NIPSCO, a NiSource Inc. subsidiary, told the Indiana Utility Regulatory Commission in November the scrubber project “improves air quality and helps ensure its generation fleet remains in compliance with current environmental regulations.”

Unlike some utilities in the Midwest, Merrillville-based NIPSCO has not announced the retirement of any of its baseload coal plants. In addition to Michigan City, they include the 1,780-megawatt R.M. Schahfer generating station near Wheatfield, Indiana, and the 604-megawatt Bailly plant near Chesterton, Indiana.

NIPSCO burns about 7 million tons of low-sulfur Powder River Basin and high-sulfur Illinois Basin steam coal annually.