County annual report · FIPS 17063
2015 Grundy County, IL Power Outage Report
In 2015, customers in Grundy County, IL went without power for an average of 4.2 hours, a total of 184K customer-hours (Illinois average 2.3 hours). That ranks 22nd worst of 100 Illinois counties and 658th of 2,484 nationally.
Compared with IL, the US
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Grundy County, 2015
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 22, 2015 21:30 | June 28, 2015 01:30 | 5d 4h | 6,911 | 129K |
| 2 | November 6, 2015 08:30 | November 6, 2015 17:00 | 8h 30m | 1,509 | 1,057 |
| 3 | February 13, 2015 08:45 | February 13, 2015 09:15 | 30m | 1,436 | 718 |
| 4 | April 10, 2015 21:00 | April 11, 2015 11:00 | 14h | 1,389 | 2,280 |
| 5 | July 17, 2015 22:00 | July 18, 2015 08:30 | 10h 30m | 1,376 | 1,059 |
| 6 | December 14, 2015 09:00 | December 14, 2015 10:00 | 1h | 1,203 | 1,203 |
| 7 | December 28, 2015 14:00 | December 31, 2015 00:15 | 2d 10h | 1,035 | 11K |
| 8 | March 13, 2015 02:00 | March 13, 2015 02:15 | 15m | 986 | 247 |
| 9 | August 24, 2015 11:00 | August 24, 2015 14:15 | 3h 15m | 976 | 493 |
| 10 | September 20, 2015 12:00 | September 21, 2015 01:00 | 13h | 922 | 482 |
Outage episodes by size in 2015: 46 reached 100+ customers, 7 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 2015, 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 | 2015 | 1.8 hrs | 0.97 | 72 min | 0.86 |
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 2015; 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, 2015, 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/2015/illinois/grundy-county