Pending cases for Northern Indiana Public Service Company’s (NIPSCO’s) electric utility include its:
- NIPSCO Generation Company declination (IURC Cause No. 46183)
- Templeton Wind Project (IURC Cause No. 46198)
- Financing Request (IURC Cause No. 46273)
- Proposed Demand Response Program (IURC Cause No. 46284)
- Quarterly Fuel Cost Adjustments (For the latest case file, click here and enter Cause Number 38706)
- Trackers under its approved 7-year infrastructure plan (IURC Cause No. 45557)
In the most recent IURC survey of residential electric bills, NIPSCO's average residential bill ranked highest among the utilities under Commission jurisdiction.
Base rates cover most infrastructure and operating/maintenance costs while rate adjustment “trackers,” as described below, allow for more frequent rate changes for specific costs as designated by law.
Base Rates
New electric base rates for NIPSCO received IURC approval in June 2025.
Previous base rates for NIPSCO's electric utility were approved in 2023 and 2019.
Trackers
In addition to base rates, Indiana electric utilities recover and credit separate, specific costs through rate adjustment mechanisms known as "trackers." Rate adjustments via trackers are reviewed by the OUCC and approved by the IURC on a quarterly, semi-annual or annual basis.
NIPSCO uses the following trackers, which comprised approximately 9% percent of a residential customer’s typical bill as of July 2025. All filings are available by entering the cause number in the IURC's Online Services Portal.
Tracker Recovers Costs for Frequency IURC Cause No. Fuel Adjustment Clause (FAC) Coal and other fuels Quarterly 38706 Transmission, Distribution & Storage System Improvement Charge (TDSIC) Projects in 7-year infrastructure plan Semi-Annual 45557 Resource Adequacy Adjustment (RA) Capacity resources needed for system reliability Semi-Annual 44155 Regional Transmission Operator (RTO) Participation in Midcontinent Independent Transmission System Operator (MISO) Semi-Annual 44156 Federally Mandated Cost Adjustment (FMCA) Critical infrastructure protection Semi-Annual 44340 Generation Cost Tracker (GCT) Schahfer Generation Project Semi-Annual 45947 Environmental Cost Tracker (ECT) Federally mandated compliance costs including emissions control equipment Semi-Annual 46033 Demand Side Management (DSM) Energy efficiency programs Annual 43618 Green Power Rider (GPR) Program allowing customers to voluntarily buy renewable energy credits
Annual 44198
Previous NIPSCO cases include:
- Base Rate Case (IURC Cause No. 46120)
- Schahfer Gas Generation proposal (Cause No. 45947)
- Gibson Solar Generation Project (Cause No. 46032)
- Fairbanks Solar Generation Project (Cause No. 46028)
- Appleseed Solar/Templeton Wind projects (Cause No. 45887)
- 2024-2026 Energy Efficiency Plan (Cause No. 45849)
- Solar and Wind Purchase Agreements (Cause No. 45887)
- Distributed generation tariff (Cause No. 45505)
- Schahfer Generation Station subdocket (Cause No. 38706 FAC 130-S1)
- 2021-2026 infrastructure plan (Cause No. 45557)
- Energy efficiency plan (Cause No. 45456)
- Renewable energy proposals (Various cause nos.)
- COVID-19 investigation (Cause No. 45380)
- 2017 Tax Cuts & Jobs Act investigation (Cause No. 45032)
- Coal combustion residuals compliance project (Cause No.44872)
Sales Taxes
The seven percent state sales tax applies to all Indiana electric utilities.
8-20-25