County annual report · FIPS 17177
2025 Stephenson County, IL Power Outage Report
In 2025, customers in Stephenson County, IL went without power for an average of 2.3 hours, a total of 28K customer-hours (Illinois average 2.5 hours). That ranks 67th worst of 102 Illinois counties and 2302nd of 3,000 nationally.
Compared with IL, the US and 2024
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Stephenson County, 2025
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 30, 2025 10:45 | July 30, 2025 22:30 | 11h 45m | 1,808 | 3,973 |
| 2 | January 14, 2025 03:15 | January 14, 2025 04:15 | 1h | 831 | 786 |
| 3 | June 27, 2025 05:15 | June 27, 2025 08:00 | 2h 45m | 727 | 1,747 |
| 4 | July 10, 2025 21:15 | July 10, 2025 22:15 | 1h | 663 | 175 |
| 5 | June 3, 2025 18:15 | June 3, 2025 21:45 | 3h 30m | 591 | 1,235 |
| 6 | August 18, 2025 18:30 | August 18, 2025 20:00 | 1h 30m | 589 | 346 |
| 7 | October 18, 2025 19:15 | October 18, 2025 19:30 | 15m | 577 | 144 |
| 8 | October 20, 2025 12:45 | October 20, 2025 18:00 | 5h 15m | 568 | 584 |
| 9 | May 2, 2025 04:15 | May 2, 2025 13:00 | 8h 45m | 565 | 175 |
| 10 | August 18, 2025 23:30 | August 19, 2025 21:45 | 22h 15m | 538 | 3,650 |
Outage episodes by size in 2025: 30 reached 100+ customers, 1 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 2025, 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 | 2024 | 2.2 hrs | 0.68 | 36 min | 0.49 |
| Rock Energy Cooperative | 2024 | 53 min | 0.48 | 27 min | 0.36 |
| 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 n/a of Illinois's customers in 2025; 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, 2025, 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/2025/illinois/stephenson-county