Southern Illinois Elec Coop
Cooperative electric utility · Illinois · #1,074 of 3,199 U.S. utilities by customers · EIA utility #17631
Southern Illinois Elec Coop is a cooperative electric utility serving 11,216 customers in Illinois. In 2025 it sold 182 gigawatt-hours of electricity for $32.11M in revenue, an average realized rate of 17.66¢ per kWh across all customer classes and — per kWh for residential customers. Its reported service territory covers 8 counties.
Customers, sales and rates by customer class (2025)
| Class | Customers | Sales (GWh) | Revenue | Avg realized rate | Share of sales |
|---|---|---|---|---|---|
| Total | 11,216 | 182 | $32.11M | 17.66¢ |
Average realized rate = revenue divided by sales as reported on EIA Form 861. It blends fixed charges, demand charges and riders into one per-kWh figure; it is not the utility's tariff rate. Estimated residential bill assumes the average residential customer's actual 2025 usage (— kWh/month).
This utility files the EIA-861S short form, which reports totals only - no breakdown by customer class is published for it.
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 11,206 | 182 | $26.95M | — |
| 2022 | 11,212 | 188 | $28.19M | — |
| 2023 | 11,223 | 172 | $28.23M | — |
| 2024 | 11,235 | 174 | $28.47M | — |
| 2025 | 11,216 | 182 | $32.11M | — |
Meters & rooftop solar (2025)
Smart (AMI) meters: 100.0% of 11,216 meters
Counties served
Alexander, ILJackson, ILJohnson, ILMassac, ILPope, ILPulaski, ILUnion, ILWilliamson, IL
Other large utilities in Illinois
- Commonwealth Edison Co - 3,261,563 customers, residential 17.71¢
- Ameren Illinois Company - 663,709 customers, residential 16.70¢
- MC Squared Energy Services, LLC - 293,923 customers, residential 8.14¢
- Homefield Energy - 160,102 customers, residential 10.64¢
- Energy Services Providers, Inc - 90,477 customers, residential 13.01¢
- Just Energy Solutions Inc. - 80,538 customers, residential 11.33¢
- City of Springfield - (IL) - 70,871 customers, residential 13.09¢
- Residents Energy, LLC - 69,834 customers, residential 17.34¢
All Illinois utilities and rates
Source: U.S. Energy Information Administration, Form EIA-861 2025 (filed by the utility; figures as published). Utility #17631 in the EIA frame.