County annual report · FIPS 17177
2021 Stephenson County, IL Power Outage Report
In 2021, customers in Stephenson County, IL went without power for an average of 2.6 hours, a total of 32K customer-hours (Illinois average 2.3 hours). That ranks 55th worst of 102 Illinois counties and 1993rd of 2,974 nationally.
Compared with IL, the US and 2020
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Stephenson County, 2021
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 14, 2021 11:45 | July 14, 2021 23:15 | 11h 30m | 1,839 | 2,248 |
| 2 | March 18, 2021 00:30 | March 18, 2021 09:15 | 8h 45m | 1,258 | 2,677 |
| 3 | December 16, 2021 02:45 | December 17, 2021 10:45 | 1d 8h | 883 | 4,638 |
| 4 | September 17, 2021 18:45 | September 17, 2021 20:00 | 1h 15m | 858 | 808 |
| 5 | December 6, 2021 07:00 | December 6, 2021 11:30 | 4h 30m | 849 | 1,543 |
| 6 | August 24, 2021 23:00 | August 25, 2021 10:00 | 11h | 814 | 1,225 |
| 7 | October 14, 2021 02:30 | October 14, 2021 05:00 | 2h 30m | 580 | 154 |
| 8 | September 7, 2021 17:30 | September 7, 2021 21:45 | 4h 15m | 547 | 471 |
| 9 | January 28, 2021 04:30 | January 28, 2021 08:00 | 3h 30m | 472 | 368 |
| 10 | June 21, 2021 02:15 | June 21, 2021 19:45 | 17h 30m | 339 | 593 |
Outage episodes by size in 2021: 21 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 2021, 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 | 2021 | 1.7 hrs | 0.77 | 43 min | 0.59 |
| Rock Energy Cooperative | 2021 | 43 min | 0.47 | - | - |
| Scenic Rivers Energy Coop | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 98% of Illinois's customers in 2021; 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, 2021, 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/2021/illinois/stephenson-county