Illinois · Cooperative
Rock Energy Cooperative
14.86¢ per kWh, bundled, EIA-861 2025. Average bill $113.26 at 762.4 kWh a month, across 9,421 customers on that row.
Illinois averaged 17.67¢/kWh and $126.59 a month. The United States averaged 17.23¢/kWh and $150.68. State and national figures come from EIA's Average Bill file.
Revenue divided by sales, EIA-861 Sales to Ultimate Customers, 2025, released October 7, 2026. Texas wires utilities come from the Delivery Companies file. The price and bill use bundled service. Customer count: 9,421, the largest residential count across service types.
Estimate a bill
The figure below is this utility's 2025 EIA residential average.
2025 EIA average
$148.60
14.86¢/kWh × 1,000 kWh. Bundled residential average, EIA-861 2025. The customer charge is already folded into this average, so it stands beside a tariff total rather than being added to it.
Annual history
| Year | ¢/kWh | Avg. bill | Avg. kWh | Customers |
|---|---|---|---|---|
| 2015 | 13.05¢ | $97.50 | 747.3 | 9,136 |
| 2016 | 13.01¢ | $101.89 | 782.9 | 9,175 |
| 2017 | 13.63¢ | $99.88 | 732.8 | 9,208 |
| 2018 | 13.51¢ | $103.67 | 767.4 | 9,228 |
| 2019 | 13.68¢ | $101.29 | 740.4 | 9,243 |
| 2020 | 13.30¢ | $102.73 | 772.3 | 9,273 |
| 2021 | 13.13¢ | $103.35 | 787.2 | 9,312 |
| 2022 | 14.25¢ | $109.09 | 765.7 | 9,347 |
| 2023 | 14.55¢ | $109.50 | 752.7 | 9,344 |
| 2024 | 14.97¢ | $111.64 | 746.0 | 9,339 |
| 2025 | 14.86¢ | $113.26 | 762.4 | 9,421 |
EIA-861, 2015–2025, using the same service type as the 2025 figure. A blank year means that service was not in the file.
Counties
Boone, McHenry, Stephenson, Winnebago.
EIA-861 Service Territory, 2025. A listed county is the county EIA recorded. It does not mean every address in the county is served. Open this utility in the bill calculator · Rate history tool