County annual report · FIPS 17187
2021 Warren County, IL Power Outage Report
In 2021, customers in Warren County, IL went without power for an average of 5.0 hours, a total of 41K customer-hours (Illinois average 2.3 hours). That ranks 23rd worst of 102 Illinois counties and 1335th 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 Warren 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 | September 21, 2021 02:45 | September 21, 2021 07:45 | 5h | 2,711 | 10K |
| 2 | December 11, 2021 08:00 | December 11, 2021 15:30 | 7h 30m | 2,369 | 8,349 |
| 3 | September 9, 2021 13:45 | September 9, 2021 17:30 | 3h 45m | 1,104 | 2,309 |
| 4 | December 16, 2021 01:00 | December 16, 2021 22:15 | 21h 15m | 1,005 | 7,352 |
| 5 | June 19, 2021 04:15 | June 21, 2021 20:45 | 2d 16h | 879 | 3,618 |
| 6 | February 27, 2021 12:00 | February 27, 2021 18:00 | 6h | 665 | 1,040 |
| 7 | June 4, 2021 19:45 | June 4, 2021 23:45 | 4h | 659 | 677 |
| 8 | July 19, 2021 15:45 | July 19, 2021 18:00 | 2h 15m | 606 | 612 |
| 9 | June 6, 2021 09:45 | June 6, 2021 10:00 | 15m | 481 | 120 |
| 10 | January 1, 2021 14:45 | January 1, 2021 18:45 | 4h | 393 | 398 |
Outage episodes by size in 2021: 17 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 Warren 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 |
|---|---|---|---|---|---|
| Ameren Illinois Company | 2021 | 3.2 hrs | 1.11 | 2.0 hrs | 0.88 |
| Ameren | - | - | - | - | - |
| McDonough Power 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 ÷ 8,244 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. Warren County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Warren 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/warren-county