County annual report · FIPS 17121
2021 Marion County, IL Power Outage Report
In 2021, customers in Marion County, IL went without power for an average of 5.0 hours, a total of 76K customer-hours (Illinois average 2.3 hours). That ranks 22nd worst of 102 Illinois counties and 1324th 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 Marion 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 | February 16, 2021 11:00 | February 16, 2021 23:00 | 12h | 8,582 | 36K |
| 2 | March 18, 2021 22:15 | March 19, 2021 12:45 | 14h 30m | 1,562 | 3,867 |
| 3 | July 5, 2021 11:45 | July 5, 2021 13:00 | 1h 15m | 858 | 862 |
| 4 | May 16, 2021 04:15 | May 16, 2021 05:45 | 1h 30m | 842 | 1,141 |
| 5 | August 12, 2021 21:45 | August 13, 2021 08:30 | 10h 45m | 636 | 5,164 |
| 6 | July 10, 2021 06:00 | July 11, 2021 22:30 | 1d 16h | 623 | 3,281 |
| 7 | January 16, 2021 21:15 | January 16, 2021 23:30 | 2h 15m | 580 | 1,016 |
| 8 | June 13, 2021 11:15 | June 13, 2021 15:30 | 4h 15m | 544 | 1,904 |
| 9 | March 4, 2021 15:30 | March 4, 2021 16:00 | 30m | 502 | 251 |
| 10 | January 19, 2021 00:45 | January 19, 2021 02:15 | 1h 30m | 387 | 387 |
Outage episodes by size in 2021: 36 reached 100+ customers, 2 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 Marion 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 |
| Tri-County Electric Coop, Inc (IL) | 2021 | 3.5 hrs | 1.86 | 63 min | 1.09 |
| Ameren | - | - | - | - | - |
| Wayne-White Counties Elec Coop | - | - | - | - | - |
| Clay Electric Coop Inc | - | - | - | - | - |
| Clinton County Elec Coop, 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 ÷ 15,234 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. Marion County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Marion 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/marion-county