Rock Energy Cooperative electricity rates
Electric cooperative · Illinois
Rock Energy Cooperative is a member-owned electric cooperative, so its customers own it and elect its board, serving 9,421 homes in Illinois. Its residential customers pay an average of 15.78¢/kWh including fixed and delivery charges, 12% less than the U.S. average.
Rate basis: EIA-861 2025 annual data, adjusted to the 12 months ending 2026-07 using the state's price trend.
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Rock Energy Cooperative bill estimates
| Monthly use | At average all-in rate |
|---|---|
| 500 kWh | $78.90 |
| 1,000 kWh | $157.80 |
| 1,500 kWh | $236.70 |
| 2,000 kWh | $315.60 |
Rock Energy Cooperative rate history
2015–2025: +14% change in the average residential rate (13.05¢ → 14.86¢). Annual EIA-861 data.
Outages & reliability
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Reliability history
| 2025 | Rock Energy Cooperative | Illinois avg | U.S. avg |
|---|---|---|---|
| Outage minutes per customer (SAIDI) | 16 | 148 | 266 |
| Outages per customer (SAIFI) | 0.40 | 0.87 | 1.34 |
| Average restoration time (CAIDI) | 40 min | — | — |
| Outage minutes excluding major storms | 15 | 63 | 121 |
Outages in counties served (2025)
From ORNL EAGLE-I, which tracks customers without power every 15 minutes. These counts cover every utility in each county. Weighted across Rock Energy Cooperative's counties, customers averaged 2 hr 37 min without power.
| County | Outage min/customer | Days with outages | Peak customers out | Worst day |
|---|---|---|---|---|
| Boone | 381 | 29 | 7,254 | 2025-08-16 |
| McHenry | 181 | 30 | 13,250 | 2025-08-17 |
| Stephenson | 139 | 44 | 1,808 | 2025-07-30 |
| Winnebago | 97 | 23 | 8,091 | 2025-03-15 |
Rock Energy Cooperative service area
Rock Energy Cooperative serves 4 counties in Illinois and 10 ZIP codes.
Boone, McHenry, Stephenson, Winnebago
Cities: Rockford, Roscoe, South Beloit, Rockton, Poplar Grove, Lake Summerset, Durand
Programs, smart meters & solar
| Smart meters (AMI) for homes | 0% |
| Time-based rate programs | None reported |
| Net-metered solar homes | 75 |
Rock Energy Cooperative at a glance
| Ownership | Electric cooperative |
| Services | — |
| Commercial rate | 12.98¢/kWh |
| Industrial rate | 10.97¢/kWh |
| Retail revenue (2025) | $27,954,000 |
| Electricity sold (2025) | 217,040 MWh |
| Balancing authority | MISO |
| EIA utility ID | 16196 |
Other utilities in Illinois
Frequently asked questions
What is Rock Energy Cooperative's electricity rate?
Rock Energy Cooperative residential customers pay an average of 15.78¢ per kWh, all charges included (EIA-861 2025 annual data, adjusted to the 12 months ending 2026-07 using the state's price trend). That's 16% below the Illinois average of 18.79¢ and 12% below the U.S. average.
What is the average Rock Energy Cooperative electric bill?
About $120 a month. The average Rock Energy Cooperative home uses 762 kWh a month. At 1,000 kWh the bill would be about $158.
How many customers does Rock Energy Cooperative have?
Rock Energy Cooperative serves 9,421 residential customers and 10,462 customers in total in Illinois, across 4 counties.
How reliable is Rock Energy Cooperative?
In 2025, the average Rock Energy Cooperative customer was without power for 16 min (SAIDI) over 0.40 interruptions (SAIFI), including major storms. Excluding major event days it was 15 min. The Illinois average was 2 hr 28 min and the U.S. average 4 hr 26 min.
Does Rock Energy Cooperative offer net metering for solar?
Rock Energy Cooperative had 75 residential net-metered customers in 2025 with 0.5 MW of capacity. Estimate solar savings at this utility's rate.
Sources: EIA-861 2025 and EIA-861M (through July 2026), OpenEI URDB, ORNL EAGLE-I, U.S. Census. Methodology. Spot an error? Rates change often, so confirm with Rock Energy Cooperative before making decisions.