County annual report · FIPS 17177
2017 Stephenson County, IL Power Outage Report
In 2017, customers in Stephenson County, IL went without power for an average of 8.8 hours, a total of 108K customer-hours (Illinois average 1.4 hours). That ranks 1st worst of 102 Illinois counties and 604th of 2,786 nationally.
Compared with IL, the US and 2016
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Stephenson County, 2017
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 20, 2017 01:00 | July 24, 2017 01:30 | 4d | 5,080 | 51K |
| 2 | June 29, 2017 01:00 | June 30, 2017 06:00 | 1d 5h | 4,868 | 23K |
| 3 | March 20, 2017 08:00 | March 20, 2017 16:30 | 8h 30m | 1,266 | 3,761 |
| 4 | May 17, 2017 19:30 | May 19, 2017 12:00 | 1d 16h | 701 | 6,471 |
| 5 | June 23, 2017 08:30 | June 23, 2017 21:30 | 13h | 657 | 3,323 |
| 6 | July 8, 2017 02:30 | July 8, 2017 03:00 | 30m | 460 | 230 |
| 7 | July 27, 2017 03:00 | July 28, 2017 01:30 | 22h 30m | 437 | 1,255 |
| 8 | March 7, 2017 06:00 | March 8, 2017 12:30 | 1d 6h | 428 | 2,321 |
| 9 | June 24, 2017 01:30 | June 24, 2017 13:00 | 11h 30m | 340 | 274 |
| 10 | August 26, 2017 00:00 | August 26, 2017 11:00 | 11h | 210 | 557 |
Outage episodes by size in 2017: 29 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 Stephenson County reported on EIA Form 861 for 2017, 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 | 2017 | 1.6 hrs | 0.82 | 55 min | 0.66 |
| Scenic Rivers Energy Coop | - | - | - | - | - |
| Rock Energy Cooperative | - | - | - | - | - |
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 2017; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 12,248 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. Stephenson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Stephenson County, IL annual power outage report, 2017, 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/2017/illinois/stephenson-county