County annual report · FIPS 17063
2021 Grundy County, IL Power Outage Report
In 2021, customers in Grundy County, IL went without power for an average of 1.9 hours, a total of 83K customer-hours (Illinois average 2.3 hours). That ranks 70th worst of 102 Illinois counties and 2248th of 2,974 nationally.
Compared with IL, the US and 2020
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Grundy County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 25, 2021 09:15 | June 26, 2021 01:30 | 16h 15m | 7,310 | 20K |
| 2 | September 7, 2021 18:30 | September 9, 2021 09:00 | 1d 14h | 5,173 | 30K |
| 3 | December 5, 2021 23:45 | December 6, 2021 09:45 | 10h | 1,262 | 3,189 |
| 4 | March 15, 2021 18:00 | March 17, 2021 00:15 | 1d 6h | 1,022 | 3,989 |
| 5 | April 26, 2021 20:15 | April 27, 2021 05:15 | 9h | 988 | 391 |
| 6 | December 11, 2021 03:45 | December 11, 2021 20:15 | 16h 30m | 863 | 852 |
| 7 | January 30, 2021 23:30 | January 31, 2021 02:45 | 3h 15m | 661 | 176 |
| 8 | December 4, 2021 14:00 | December 4, 2021 21:00 | 7h | 570 | 177 |
| 9 | December 6, 2021 10:30 | December 6, 2021 11:15 | 45m | 413 | 306 |
| 10 | September 19, 2021 19:00 | September 19, 2021 20:45 | 1h 45m | 361 | 365 |
Outage episodes by size in 2021: 30 reached 100+ customers, 4 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 2021, 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 | 2021 | 1.7 hrs | 0.77 | 43 min | 0.59 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 98% of Illinois's customers in 2021; 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, 2021, 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/2021/illinois/grundy-county