County annual report · FIPS 17177
2018 Stephenson County, IL Power Outage Report
In 2018, customers in Stephenson County, IL went without power for an average of 3.0 hours, a total of 37K customer-hours (Illinois average 2.5 hours). That ranks 42nd worst of 102 Illinois counties and 1500th of 2,798 nationally.
Compared with IL, the US and 2017
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Stephenson County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 18, 2018 01:30 | October 18, 2018 02:30 | 1h | 1,317 | 947 |
| 2 | August 6, 2018 01:30 | August 6, 2018 21:30 | 20h | 1,133 | 3,935 |
| 3 | June 18, 2018 19:30 | June 19, 2018 21:00 | 1d 1h | 890 | 801 |
| 4 | March 4, 2018 17:00 | March 4, 2018 18:30 | 1h 30m | 724 | 786 |
| 5 | August 29, 2018 01:30 | August 30, 2018 11:30 | 1d 10h | 628 | 5,896 |
| 6 | July 11, 2018 11:00 | July 11, 2018 15:00 | 4h | 622 | 2,486 |
| 7 | April 24, 2018 16:30 | April 24, 2018 18:30 | 2h | 621 | 681 |
| 8 | September 16, 2018 22:00 | September 17, 2018 06:00 | 8h | 551 | 1,004 |
| 9 | July 14, 2018 01:00 | July 15, 2018 10:00 | 1d 9h | 471 | 7,201 |
| 10 | April 14, 2018 17:30 | April 15, 2018 12:00 | 18h 30m | 397 | 983 |
Outage episodes by size in 2018: 25 reached 100+ customers, 2 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 2018, 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 | 2018 | 2.0 hrs | 0.82 | 58 min | 0.70 |
| 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 92% of Illinois's customers in 2018; 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, 2018, 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/2018/illinois/stephenson-county