County annual report · FIPS 17135
2021 Montgomery County, IL Power Outage Report
In 2021, customers in Montgomery County, IL went without power for an average of 2.7 hours, a total of 28K customer-hours (Illinois average 2.3 hours). That ranks 52nd worst of 102 Illinois counties and 1969th 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 Montgomery 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 | April 27, 2021 13:45 | April 27, 2021 17:00 | 3h 15m | 5,299 | 8,005 |
| 2 | November 3, 2021 11:15 | November 3, 2021 13:30 | 2h 15m | 964 | 1,454 |
| 3 | April 10, 2021 00:45 | April 10, 2021 02:45 | 2h | 636 | 672 |
| 4 | May 26, 2021 06:30 | May 26, 2021 08:00 | 1h 30m | 557 | 836 |
| 5 | July 15, 2021 21:30 | July 15, 2021 22:45 | 1h 15m | 525 | 556 |
| 6 | May 14, 2021 20:45 | May 15, 2021 14:30 | 17h 45m | 332 | 511 |
| 7 | July 1, 2021 13:00 | July 1, 2021 16:15 | 3h 15m | 332 | 129 |
| 8 | August 12, 2021 18:45 | August 14, 2021 02:45 | 1d 8h | 248 | 2,044 |
| 9 | July 13, 2021 00:00 | July 13, 2021 14:15 | 14h 15m | 247 | 1,512 |
| 10 | April 30, 2021 02:15 | April 30, 2021 11:15 | 9h | 213 | 1,744 |
Outage episodes by size in 2021: 16 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 Montgomery 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 |
| Rural Electric Conven Coop | 2018 | 4.0 hrs | 1.91 | 2.0 hrs | 1.84 |
| Ameren | - | - | - | - | - |
| Shelby Electric Coop, Inc | - | - | - | - | - |
| M J M Electric Cooperative Inc | - | - | - | - | - |
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 ÷ 10,344 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. Montgomery County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Montgomery 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/montgomery-county