County annual report · FIPS 17063
2025 Grundy County, IL Power Outage Report
In 2025, customers in Grundy County, IL went without power for an average of 1.1 hours, a total of 47K customer-hours (Illinois average 2.5 hours). That ranks 91st worst of 102 Illinois counties and 2729th of 3,000 nationally.
Compared with IL, the US and 2024
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Grundy County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 17, 2025 06:45 | August 18, 2025 21:00 | 1d 14h | 1,309 | 7,858 |
| 2 | May 15, 2025 23:30 | May 18, 2025 03:15 | 2d 3h | 1,244 | 18K |
| 3 | November 11, 2025 05:00 | November 11, 2025 05:15 | 15m | 1,210 | 303 |
| 4 | July 27, 2025 06:30 | July 27, 2025 08:45 | 2h 15m | 721 | 742 |
| 5 | July 24, 2025 21:15 | July 26, 2025 22:15 | 2d 1h | 654 | 3,604 |
| 6 | May 13, 2025 17:00 | May 13, 2025 17:15 | 15m | 572 | 143 |
| 7 | May 20, 2025 10:00 | May 20, 2025 20:45 | 10h 45m | 426 | 859 |
| 8 | July 16, 2025 20:45 | July 17, 2025 02:45 | 6h | 286 | 170 |
| 9 | October 18, 2025 13:30 | October 18, 2025 14:30 | 1h | 245 | 245 |
| 10 | November 9, 2025 16:00 | November 9, 2025 21:30 | 5h 30m | 227 | 587 |
Outage episodes by size in 2025: 27 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 2025, 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 | 2024 | 2.2 hrs | 0.68 | 36 min | 0.49 |
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 2025; 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, 2025, 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/2025/illinois/grundy-county