County annual report · FIPS 17177
2015 Stephenson County, IL Power Outage Report
In 2015, customers in Stephenson County, IL went without power for an average of 5.2 hours, a total of 64K customer-hours (Illinois average 2.3 hours). That ranks 18th worst of 100 Illinois counties and 541st 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 Stephenson 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 | August 18, 2015 23:00 | August 19, 2015 02:45 | 3h 45m | 3,957 | 4,258 |
| 2 | December 24, 2015 02:30 | December 24, 2015 21:00 | 18h 30m | 3,846 | 24K |
| 3 | July 18, 2015 19:30 | July 19, 2015 00:00 | 4h 30m | 2,066 | 1,265 |
| 4 | October 24, 2015 22:00 | October 25, 2015 03:00 | 5h | 1,242 | 3,144 |
| 5 | July 13, 2015 10:30 | July 13, 2015 21:30 | 11h | 957 | 3,900 |
| 6 | July 30, 2015 11:30 | July 30, 2015 17:00 | 5h 30m | 877 | 896 |
| 7 | November 29, 2015 19:00 | November 30, 2015 02:00 | 7h | 868 | 907 |
| 8 | November 12, 2015 01:30 | November 13, 2015 02:30 | 1d 1h | 840 | 2,521 |
| 9 | June 3, 2015 01:15 | June 3, 2015 02:15 | 1h | 816 | 815 |
| 10 | January 28, 2015 21:00 | January 28, 2015 21:30 | 30m | 763 | 382 |
Outage episodes by size in 2015: 28 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 Stephenson 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 |
| 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 2015; 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, 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/stephenson-county