County annual report · FIPS 17119
2021 Madison County, IL Power Outage Report
In 2021, customers in Madison County, IL went without power for an average of 3.4 hours, a total of 367K customer-hours (Illinois average 2.3 hours). That ranks 39th worst of 102 Illinois counties and 1704th 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 Madison 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 | December 11, 2021 02:45 | December 13, 2021 00:45 | 1d 22h | 11,767 | 103K |
| 2 | March 18, 2021 07:15 | March 19, 2021 06:45 | 23h 30m | 7,670 | 21K |
| 3 | August 19, 2021 11:00 | August 20, 2021 02:30 | 15h 30m | 6,470 | 6,448 |
| 4 | July 22, 2021 11:45 | July 22, 2021 19:00 | 7h 15m | 5,370 | 4,253 |
| 5 | August 12, 2021 20:30 | August 14, 2021 00:15 | 1d 3h | 4,817 | 23K |
| 6 | March 30, 2021 05:30 | March 30, 2021 17:00 | 11h 30m | 4,473 | 7,999 |
| 7 | September 20, 2021 12:45 | September 20, 2021 18:30 | 5h 45m | 4,181 | 6,332 |
| 8 | July 15, 2021 08:30 | July 17, 2021 04:15 | 1d 19h | 3,573 | 8,742 |
| 9 | June 26, 2021 13:45 | June 27, 2021 05:00 | 15h 15m | 3,568 | 18K |
| 10 | April 10, 2021 14:00 | April 11, 2021 13:30 | 23h 30m | 3,161 | 15K |
Outage episodes by size in 2021: 122 reached 100+ customers, 23 reached 1,000+ customers, 1 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 Madison 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 |
| Southwestern Electric Coop Inc - (IL) | 2021 | 3.9 hrs | 2.53 | 3.8 hrs | 2.48 |
| Ameren | - | - | - | - | - |
| M J M Electric Cooperative Inc | - | - | - | - | - |
| Clinton County Elec Coop, Inc | - | - | - | - | - |
| City of Highland | - | - | - | - | - |
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 ÷ 107,855 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. Madison County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Madison 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/madison-county