Rock Energy Cooperative electricity rates in Illinois, 2025
Rock Energy Cooperative’s 9,421 residential customers paid an average of 14.86¢ per kWh in 2025, 16% below the Illinois average of 17.67¢. The typical home used 762 kWh a month, for an average bill of $113.
- 14.86¢avg ¢/kWh (2025)−0.11¢ (-0.7%) vs 2024
- $113Avg monthly billIllinois: $127
- 762 kWhAvg monthly useIllinois: 716 kWh
- 9,421Residential customersFull-service utility
| Sector | Customers | Sales (MWh) | Revenue | ¢/kWh 2025 | ¢/kWh 2024 | Change |
|---|---|---|---|---|---|---|
| Residential | 9,421 | 86,187 | $12,804,000 | 14.86¢ | 14.97¢ | −0.11¢ (-0.7%) |
| Commercial | 1,019 | 86,313 | $10,548,000 | 12.22¢ | 11.82¢ | +0.40¢ (+3.4%) |
| Industrial | 22 | 44,540 | $4,602,000 | 10.33¢ | 10.77¢ | −0.44¢ (-4.1%) |
| All sectors | 10,462 | 217,040 | $27,954,000 | 12.88¢ | 12.80¢ | +0.08¢ (+0.7%) |
How Rock Energy Cooperative compares
- Illinois residential average, 2025: 17.67¢ per kWh, 716 kWh a month, $127 average bill. U.S. average: 17.23¢, 874 kWh, $151.
- Among 24 full-service utilities in Illinois with at least 1,000 residential customers, Rock Energy Cooperative ranks 10 of 24 from lowest to highest average price.
- Latest monthly figure: Illinois homes paid 19.32¢ per kWh in August 2026 (preliminary), against 18.03¢ in August 2025. Summer months often run higher than the annual average.
- From 2024 to 2025 this average fell 0.7%; the state average rose 11.3%.
- Rock Energy Cooperative is an electric cooperative, owned by the members it serves; its board sets rates. Balancing authority: MISO.
Where Rock Energy Cooperative serves
EIA lists 4 Illinois counties in its 2025 service territory: Boone, McHenry, Stephenson, Winnebago.
10 ZIP codes are matched to Rock Energy Cooperative in NREL’s 2024 ZIP file: 61011, 61019, 61024, 61065, 61072, 61073, 61079, 61080, 61101, 61103. Utility boundaries do not follow ZIP lines, so a ZIP can have more than one provider.
Illinois full-service utilities with similar rates
| Provider | ¢/kWh | Avg bill | Customers |
|---|---|---|---|
| City of Batavia (IL) | 14.04¢ | $105 | 10,072 |
| City of St Charles (IL) | 14.58¢ | $104 | 14,901 |
| City of Naperville (IL) | 14.61¢ | $112 | 57,225 |
| Southeastern IL Elec Coop, Inc | 14.80¢ | $181 | 22,607 |
| Norris Electric Coop | 15.06¢ | $177 | 18,163 |
| Southwestern Electric Coop Inc (IL) | 15.37¢ | $178 | 24,414 |
| Corn Belt Energy Corporation | 15.59¢ | $148 | 34,952 |
| Tri-County Electric Coop, Inc (IL) | 16.18¢ | $201 | 16,203 |
Sources
- U.S. Energy Information Administration, Annual Electric Power Industry Report, Form EIA-861, 2025 final data (f8612025.zip, file dated October 7, 2026): Sales to Ultimate Customers, Average Monthly Bill and Service Territory tables.
- EIA Form EIA-861, 2024 final data (f8612024.zip, file dated December 4, 2025), for the 2024 comparison.
- EIA Electric Power Monthly, Table 5.6.A (average price by state, August 2026 and August 2025; 2026 values are preliminary), file dated October 22, 2026.
- National Renewable Energy Laboratory via OpenEI, U.S. Electric Utility Companies and Rates: Look-up by Zipcode (2024) (investor-owned and other utilities, files dated November 10, 2025), used only to match ZIP codes to utilities.
Average price = residential revenue ÷ residential kWh sold, as reported to EIA. It includes fixed monthly charges, taxes passed through in revenue and seasonal tiers, averaged over the year. Your own rate depends on your tariff and usage.