County annual report · FIPS 17135
2018 Montgomery County, IL Power Outage Report
In 2018, customers in Montgomery County, IL went without power for an average of 2.4 hours, a total of 24K customer-hours (Illinois average 2.5 hours). That ranks 48th worst of 102 Illinois counties and 1702nd of 2,798 nationally.
Compared with IL, the US and 2017
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Montgomery County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 15, 2018 11:00 | June 15, 2018 14:15 | 3h 15m | 842 | 1,892 |
| 2 | July 1, 2018 23:00 | July 2, 2018 13:45 | 14h 45m | 705 | 2,001 |
| 3 | August 10, 2018 19:30 | August 11, 2018 19:30 | 1d | 597 | 1,246 |
| 4 | November 19, 2018 14:45 | November 20, 2018 13:15 | 22h 30m | 526 | 1,348 |
| 5 | August 7, 2018 06:00 | August 8, 2018 01:45 | 19h 45m | 523 | 2,484 |
| 6 | March 3, 2018 03:45 | March 3, 2018 09:00 | 5h 15m | 437 | 1,300 |
| 7 | March 4, 2018 19:00 | March 4, 2018 20:30 | 1h 30m | 437 | 656 |
| 8 | July 20, 2018 04:30 | July 20, 2018 09:15 | 4h 45m | 333 | 558 |
| 9 | February 25, 2018 09:45 | February 25, 2018 13:30 | 3h 45m | 278 | 435 |
| 10 | June 28, 2018 21:15 | June 29, 2018 19:45 | 22h 30m | 244 | 1,714 |
Outage episodes by size in 2018: 19 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 Montgomery County reported on EIA Form 861 for 2018, 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 | 2018 | 3.5 hrs | 1.06 | 1.8 hrs | 0.90 |
| Southwestern Electric Coop Inc - (IL) | 2018 | 4.6 hrs | 1.89 | 4.6 hrs | 1.89 |
| 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 92% of Illinois's customers in 2018; 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, 2018, 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/2018/illinois/montgomery-county