States › Illinois › Cook County
Electric utilities serving Cook County, Illinois
Utilities that list the county in their Form EIA-861 service territory for 2024, with each one's average price, bill and outage minutes.
Cook County, Illinois, appears in the Form EIA-861 service territory of 3 utilities for 2024; Commonwealth Edison Co, Village of Winnetka and University of Illinois are the largest by residential customers statewide.
Its average residential price was 15.22¢ per kilowatthour, against a Illinois average of 15.87¢ and a US average of 16.48¢. Each price is the utility's figure for all of its Illinois customers, not for this county alone.
The median SAIDI they reported was 131.9 minutes per customer including major event days; the median among all Illinois utilities reporting was 131.9.
The Census Bureau estimates the county's population at 5,194,625. EIA does not publish customers by county, so which utility serves a given address has to be confirmed with the utility or the state utility commission.
Average price is revenue divided by sales for the sector and year; it is not a tariff rate. Reliability figures are as reported by utilities to EIA on Form 861 and may use different calculation methods. Figures are for each utility's whole Illinois operation; EIA publishes nothing at county level.
Utilities and their 2024 figures
| Utility | Ownership | Residential customers | ¢ per kWh | Monthly bill | SAIDI, all events | SAIDI, no major events |
|---|---|---|---|---|---|---|
| Commonwealth Edison Co | Investor-owned | 3,727,675 | 15.22¢ | $88.72 | 131.9 | 35.6 |
| Village of Winnetka short form | Municipal | 5,044 | — | — | — | — |
| University of Illinois short form | State | 1 | — | — | — | — |
Ordered by residential customers in Illinois. Short-form filers are small utilities that report only totals to EIA, so no residential price is available; their all-sector revenue per kWh was Village of Winnetka 13.76¢, University of Illinois 11.25¢. A utility with no customers shown reported its retail sales elsewhere or delivers power that other companies bill for.
Against the state and the country
| Measure, 2024 | Utilities listing Cook County | Illinois | United States |
|---|---|---|---|
| Average residential price per kWh | 15.22¢ median | 15.87¢ | 16.48¢ |
| Average monthly residential bill | $88.72 median | $109.99 | $142.26 |
| SAIDI, all events (minutes) | 131.9 median | 131.9 median | 184.5 median |
| SAIDI, without major event days | 35.6 median | 85.0 median | 99.8 median |
| Utilities counted | 3 | 79 | 1,413 |
Outage minutes reported
SAIDI for 2024 across each utility's whole system, including major event days (paler bars: only the figure without major event days was reported). Not a measure of outages in Cook County itself.
Population: 5,194,625 (U.S. Census Bureau, Vintage 2025 estimate). Statewide, residential sales came to 3,526 kWh per resident in 2024.
Other Illinois counties
- Champaign County 5
- Christian County 3
- Clark County 6
- Clay County 7
- Clinton County 7
- Coles County 3
- Crawford County 2
- Cumberland County 5
- DeKalb County 1
- De Witt County 3
- Douglas County 4
- DuPage County 3
All 102 counties and every Illinois utility
Questions and answers
Who provides electricity in Cook County?
Commonwealth Edison Co, Village of Winnetka and University of Illinois list the county in their Form EIA-861 service territory for 2024. Territories overlap, and a utility may cover only a corner of the county.
What is the electricity price in Cook County?
EIA has no county-level prices. The utilities serving the county reported average residential prices of 15.22¢ per kilowatthour across their Illinois customers in 2024; the state average was 15.87¢.
How reliable is power in Cook County?
Reliability is reported per utility, not per county. The utilities listed reported a median of 131.9 minutes of interruption per customer in 2024 including major event days and 35.6 minutes excluding them.
Provenance
Source: U.S. Energy Information Administration, Form EIA-861 for 2024, final release: service territory file (counties by utility), sales to ultimate customers, reliability and short form files. State and US averages: Form EIA-861M workbook. Population: U.S. Census Bureau. Public domain. To confirm the utility at an address, ask the utility or the state utility commission.