NIPSCO chooses a greener path to comply with NDPES


Algaecide reduction in the first year


UV blocker chemical from their treatment program


Water quality and environmental impact

Complying with NPDES regulations

In the search of an eco-friendly and effective solution to comply with NPDES discharge regulations, NIPSCO installed 5 MPC-Buoy systems at R. M. Schahfer Generating Station in Indiana, USA. High TSS and pH are mainly caused by algal blooms which are now treated with the ultrasound technology of LG Sonic.

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.

A safe and effective solution

NIPSCO is a company that is continually working to manage and improve their environmental impact. In their search to find a safe and effective solution for their algae problems, this led them to the LG Sonic MPC-Buoy. Together with LG Sonic, NIPSCO is taking steps to a cleaner energy future.

LG Sonic ultrasound technology is chemical-free, proven to be safe for fish, plants and does not cause algae to release their toxins in the water. NIPSCO is one of six power plants where MPC-Buoys are being used to safely improve the water quality.

Improved water quality and safe discharge water

Since the start of the project NIPSCO has seen significant improvement in their water quality. After a few months of tuning the technology, the MPC-Buoy systems successfully controlled the growth of algae in the reservoir. This reduced the TSS levels, making sure that their discharge water is safe and generating units stay operational.

Project details

Location Chicago, US Industry Power generation Client NIPSCO
  • Reduced TSS levels at the plant discharge
  • Improved plant discharge water quality and environmental impact
  • Expect to reduce algaecide usage as much as 50% in the second year

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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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