The Indiana Office of Air Quality (OAQ) is taking comment until Aug. 27 on a draft air permit change that would allow Northern Indiana Public Service Co. to add 150,000 tons per year of coal delivery via truck at the Michigan City power plant.
“Presently, coal is transported to the station by rail cars,” the office said in a draft approval document. “Adverse weather during the past winter and other rail logistics issues, have hampered the rail transport of coal. The coal stock at the station has been running low, therefore to supplement coal supply for the station and help rebuild inventory, the coal storage pile will have one additional drop point for truck unloading on to the storage pile.”
The trucks will enter through the west gate of the station where the coal will be unloaded within the existing coal pile footprint, usually near the coal reclaim hopper area. The unloading pile area is expected to be approximately 200 feet by 100 feet. The existing front-end loaders will be used to reclaim coal from the pile.
Michigan City has one coal unit, Unit 12, that consists of one cyclone coal-fired boiler with a design heat input capacity of 4650 million Btu per hour (MMBtu/hr). An activated carbon injection system for control of mercury emissions was permitted in 2014, and hte unit has an electrostatic precipitator with a flue gas conditioning system for control of particulate matter. Boiler 12 has a selective catalytic reduction system for NOX control. A CDS Flue Gas Desulfurization System and a fabric filter baghouse were permitted to be installed on Unit 12 in 2013. The FGD is due for operation by 2018.
NIPSCO, with headquarters in Merrillville, Ind., is one of the seven energy distribution companies of NiSource (NYSE: NI).