County annual report · FIPS 17063
2023 Grundy County, IL Power Outage Report
In 2023, customers in Grundy County, IL went without power for an average of 1.1 hours, a total of 48K customer-hours (Illinois average 4.0 hours). That ranks 94th worst of 102 Illinois counties and 2636th of 2,977 nationally.
Compared with IL, the US and 2022
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Grundy County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 11, 2023 21:30 | July 12, 2023 02:00 | 4h 30m | 4,845 | 3,117 |
| 2 | July 29, 2023 04:30 | July 30, 2023 21:45 | 1d 17h | 3,146 | 25K |
| 3 | June 25, 2023 07:00 | June 25, 2023 20:00 | 13h | 1,865 | 5,157 |
| 4 | June 9, 2023 14:45 | June 9, 2023 15:00 | 15m | 426 | 107 |
| 5 | December 18, 2023 13:45 | December 18, 2023 23:30 | 9h 45m | 381 | 1,356 |
| 6 | October 19, 2023 15:45 | October 19, 2023 16:45 | 1h | 370 | 370 |
| 7 | March 22, 2023 18:00 | March 23, 2023 05:30 | 11h 30m | 357 | 321 |
| 8 | May 8, 2023 01:00 | May 8, 2023 23:30 | 22h 30m | 243 | 665 |
| 9 | September 15, 2023 16:45 | September 15, 2023 20:00 | 3h 15m | 219 | 228 |
| 10 | April 20, 2023 17:00 | April 20, 2023 17:15 | 15m | 203 | 51 |
Outage episodes by size in 2023: 25 reached 100+ customers, 3 reached 1,000+ customers, 0 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Grundy County reported on EIA Form 861 for 2023, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Commonwealth Edison Co | 2023 | 1.6 hrs | 0.61 | 35 min | 0.48 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about n/a of Illinois's customers in 2023; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 43,433 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Grundy County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Grundy County, IL annual power outage report, 2023, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2023/illinois/grundy-county