County annual report · FIPS 17023
2021 Clark County, IL Power Outage Report
In 2021, customers in Clark County, IL went without power for an average of 4.1 hours, a total of 32K customer-hours (Illinois average 2.3 hours). That ranks 28th worst of 102 Illinois counties and 1527th 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 Clark 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 | September 6, 2021 05:45 | September 6, 2021 14:15 | 8h 30m | 1,498 | 3,729 |
| 2 | June 19, 2021 02:15 | June 20, 2021 00:45 | 22h 30m | 1,362 | 9,403 |
| 3 | October 25, 2021 19:00 | October 25, 2021 20:00 | 1h | 1,013 | 534 |
| 4 | February 20, 2021 16:00 | February 20, 2021 18:15 | 2h 15m | 795 | 1,194 |
| 5 | February 28, 2021 18:15 | February 28, 2021 20:00 | 1h 45m | 391 | 578 |
| 6 | February 7, 2021 08:45 | February 7, 2021 10:00 | 1h 15m | 362 | 453 |
| 7 | February 14, 2021 12:30 | February 14, 2021 13:45 | 1h 15m | 362 | 407 |
| 8 | August 9, 2021 11:30 | August 9, 2021 17:15 | 5h 45m | 361 | 272 |
| 9 | October 11, 2021 19:15 | October 12, 2021 00:45 | 5h 30m | 318 | 604 |
| 10 | August 12, 2021 21:45 | August 13, 2021 07:45 | 10h | 304 | 912 |
Outage episodes by size in 2021: 29 reached 100+ customers, 3 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 Clark 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 | - | - | - | - | - |
| Norris Electric Coop | - | - | - | - | - |
| Coles-Moultrie Electric Coop | - | - | - | - | - |
| Enerstar Power Corp | - | - | - | - | - |
| City of Casey - (IL) | - | - | - | - | - |
| City of Marshall - (IL) | - | - | - | - | - |
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 ÷ 7,829 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. Clark County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Clark 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/clark-county