County annual report · FIPS 17009
2025 Brown County, IL Power Outage Report
In 2025, customers in Brown County, IL went without power for an average of 1.3 hours, a total of 3,924 customer-hours (Illinois average 2.5 hours). That ranks 89th worst of 102 Illinois counties and 2676th 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 Brown 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 | April 21, 2025 02:15 | April 21, 2025 07:30 | 5h 15m | 383 | 843 |
| 2 | May 1, 2025 04:45 | May 1, 2025 06:15 | 1h 30m | 178 | 267 |
| 3 | March 15, 2025 01:30 | March 15, 2025 10:15 | 8h 45m | 165 | 828 |
| 4 | August 12, 2025 17:15 | August 12, 2025 18:15 | 1h | 136 | 136 |
| 5 | December 16, 2025 15:15 | December 16, 2025 18:00 | 2h 45m | 68 | 136 |
| 6 | March 31, 2025 17:45 | March 31, 2025 19:15 | 1h 30m | 53 | 31 |
| 7 | December 18, 2025 16:15 | December 18, 2025 18:15 | 2h | 50 | 63 |
| 8 | August 25, 2025 10:15 | August 25, 2025 18:00 | 7h 45m | 49 | 169 |
| 9 | April 29, 2025 18:15 | April 29, 2025 22:00 | 3h 45m | 48 | 74 |
| 10 | November 29, 2025 19:15 | November 29, 2025 21:45 | 2h 30m | 37 | 55 |
Outage episodes by size in 2025: 4 reached 100+ customers, 0 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 Brown 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 |
|---|---|---|---|---|---|
| Ameren Illinois Company | 2024 | 3.7 hrs | 1.13 | 2.0 hrs | 0.91 |
| Adams Electric Coop | 2018 | 2.2 hrs | 1.12 | 2.2 hrs | 1.12 |
| Ameren | - | - | - | - | - |
| Illinois Rural Electric 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 ÷ 3,007 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. Brown County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Brown 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/brown-county