NIPSCO reduced TSS levels to comply with NPDES regulations


Algaecide reduction within two years


UV blocker chemical from their treatment program


Water quality and environmental impact

Complying with NPDES regulations

NIPSCO began its cooperation with LG Sonic with the main goal of reducing TSS levels to comply with NPDES Regulatory Discharge Limits. Since the installation of 5 MPC-Buoy systems in the spring of 2019, TSS levels reduced to less than 3ppm.

R.M. Schahfer Generating Station in Northwest Indiana (United States) consists of four coal-fired units and two natural gas-fired units. To operate, the power station takes in water from the Kankakee River and daily discharges back as much as 21 million gallons of water. NPDES Regulatory Discharge Limits for TSS are 30ppm daily and average of 15ppm monthly. For years, NIPSCO tried to lower TSS levels using algaecide, but it never gave consistent results. Despite the use of chemicals, the filters from TSS samples remained green of algal blooms.

NIPSCO uses a large reservoir for settling out suspended solids prior to discharging the water back to the Kankakee River. This water is rich in nutrients, causing algae to grow at an undesired rate. Algae has a direct effect on pH and TSS levels in water.

In order to comply with NPDES effluent regulations, power facilities have to keep their discharge within strict pH and TSS ranges. The inability to comply with the discharge limitations in their permit could result in hefty fines and potentially result in the inability to operate the generating units.  Not being able to discharge could also result in damage to the large cooling units, which are costly to repair.

Improved water quality and safe discharge

Since the installation of five MPC-Buoy systems in the spring of 2019, TSS levels remain at lower levels than 3ppm: “I don’t think I have seen TSS higher than 3ppm and it usually is below 2ppm. Water is very clear” said Brian Snyder, Senior Chemical and Environmental Specialist. NIPSCO calculated that using LG Sonic technology, just by reducing chemicals alone, the ROI of MPC-Buoys would be less than 2 years.

Project details

Location Wheatfield, US Industry Power generation Client NIPSCO
  • TSS levels reduced to less than 3ppm
  • Since installation, TSS levels never exceeded monthly average for compliance
  • 66% algaecide reduction within the first two years
Founded in 1912, NIPSCO is one of the largest natural gas and electric company in the state of Indiana, serving more than 1.2 million customers.

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Applied product

LG Sonic developed the MPC-Buoy specifically for larger water surfaces such as cooling reservoirs and drinking water reservoirs.


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