Rates by state / Illinois / Interstate Gas Supply, Inc.
Retail Power Marketer · 22,865 residential customers
Interstate Gas Supply, Inc. electricity rates
Residential customers paid an average of 21.6¢ per kWh in 2025, 15% above the Illinois average of 18.8¢ for the latest 12 months.
Interstate Gas Supply, Inc. reports the energy (supply) part of the bill only. The rate above adds the Illinois average for the other part, so treat it as an estimate.
Average rate
21.6¢/kWh
2025, all residential revenue ÷ kWh
Average bill
$132/mo
At 613 kWh a month
1-year change
+10.7%
5 years: +35.8%
Average rate by year
202015.9¢
202116.3¢
202219.2¢
202319.0¢
202419.5¢
202521.6¢
Interstate Gas Supply, Inc. bill at different usage levels
Estimated monthly bill at Interstate Gas Supply, Inc.'s 2025 average rate of 21.6¢ per kWh. Actual bills vary with your plan, fixed charges and taxes.
| Monthly use | Interstate Gas Supply, Inc. | Illinois average |
|---|---|---|
| 500 kWh (about average here) | $108 | $94 |
| 750 kWh | $162 | $141 |
| 1,000 kWh | $216 | $188 |
| 1,500 kWh | $323 | $282 |
| 2,000 kWh | $431 | $376 |
Other utilities in Illinois
| Utility | Customers | Rate |
|---|---|---|
| Commonwealth Edison Co | 3,753,924 | 17.7¢ |
| Ameren Illinois Company | 1,062,810 | 16.7¢ |
| MC Squared Energy Services, LLC | 263,681 | 17.0¢ |
| Homefield Energy | 147,108 | 19.5¢ |
| Reliant Energy Northeast LLC | 142,167 | 20.8¢ |
| Constellation NewEnergy, Inc | 125,423 | 18.3¢ |
| MidAmerican Energy Co | 73,481 | 10.0¢ |
| City of Springfield - (IL) | 59,366 | 13.1¢ |
Interstate Gas Supply, Inc.: common questions
- How much does Interstate Gas Supply, Inc. charge per kWh?
- Interstate Gas Supply, Inc. residential customers paid an average of 21.6¢ per kWh in 2025, counting all charges, according to EIA Form 861 data. This is an estimate: Interstate Gas Supply, Inc. reports only part of the bill, so the Illinois average for the other part is added.
- What is the average Interstate Gas Supply, Inc. electric bill?
- The average Interstate Gas Supply, Inc. household used 613 kWh a month in 2025, which works out to about $132 a month at the average rate.
- Is Interstate Gas Supply, Inc. cheaper than other utilities in Illinois?
- Interstate Gas Supply, Inc.'s average rate is 15% above the Illinois average of 18.8¢. 49 of 77 utilities in Illinois have a lower average rate.
- Did Interstate Gas Supply, Inc. raise rates?
- Interstate Gas Supply, Inc.'s average residential rate changed +10.7% from 2024 to 2025 and +35.8% since 2020.
- Is my Interstate Gas Supply, Inc. bill too high?
- Enter the kWh and amount from your bill in the free bill check on AverageElectricBill.com. It compares your use with similar Illinois homes and your rate with Interstate Gas Supply, Inc.'s average.
Got a Interstate Gas Supply, Inc. bill?
Check my billSource: U.S. EIA Form EIA-861, 2025 final data.