County annual report · FIPS 17181
2021 Union County, IL Power Outage Report
In 2021, customers in Union County, IL went without power for an average of 1.6 hours, a total of 16K customer-hours (Illinois average 2.3 hours). That ranks 82nd worst of 102 Illinois counties and 2426th 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 Union 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 00:45 | April 27, 2021 04:15 | 3h 30m | 4,694 | 7,045 |
| 2 | April 29, 2021 12:00 | April 29, 2021 13:00 | 1h | 1,409 | 458 |
| 3 | December 18, 2021 05:30 | December 18, 2021 18:00 | 12h 30m | 452 | 2,501 |
| 4 | October 2, 2021 16:00 | October 2, 2021 21:45 | 5h 45m | 415 | 1,497 |
| 5 | June 2, 2021 02:00 | June 2, 2021 22:45 | 20h 45m | 284 | 441 |
| 6 | July 10, 2021 01:30 | July 10, 2021 06:00 | 4h 30m | 228 | 770 |
| 7 | April 10, 2021 00:00 | April 10, 2021 04:45 | 4h 45m | 118 | 472 |
| 8 | February 14, 2021 07:30 | February 14, 2021 13:30 | 6h | 117 | 494 |
| 9 | October 10, 2021 17:45 | October 11, 2021 00:45 | 7h | 111 | 579 |
| 10 | December 29, 2021 21:30 | December 30, 2021 00:45 | 3h 15m | 86 | 123 |
Outage episodes by size in 2021: 9 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 Union 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 | - | - | - | - | - |
| Egyptian Electric Coop Assn | - | - | - | - | - |
| Southern Illinois Elec 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 ÷ 10,277 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. Union County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Union 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/union-county