County annual report · FIPS 17127
2021 Massac County, IL Power Outage Report
In 2021, customers in Massac County, IL went without power for an average of 0.9 hours, a total of 7,462 customer-hours (Illinois average 2.3 hours). That ranks 96th worst of 102 Illinois counties and 2696th 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 Massac 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 | March 26, 2021 00:45 | March 26, 2021 02:45 | 2h | 756 | 585 |
| 2 | June 1, 2021 23:15 | June 2, 2021 01:00 | 1h 45m | 754 | 651 |
| 3 | June 13, 2021 05:45 | June 13, 2021 14:45 | 9h | 651 | 4,521 |
| 4 | October 12, 2021 19:30 | October 12, 2021 23:00 | 3h 30m | 143 | 402 |
| 5 | September 13, 2021 22:30 | September 13, 2021 23:30 | 1h | 103 | 77 |
| 6 | August 24, 2021 23:45 | August 25, 2021 01:45 | 2h | 47 | 94 |
| 7 | August 10, 2021 19:45 | August 11, 2021 01:30 | 5h 45m | 39 | 94 |
| 8 | February 15, 2021 11:45 | February 15, 2021 15:45 | 4h | 34 | 81 |
| 9 | September 26, 2021 13:45 | September 27, 2021 11:30 | 21h 45m | 31 | 674 |
| 10 | June 14, 2021 00:00 | June 14, 2021 05:15 | 5h 15m | 10 | 50 |
Outage episodes by size in 2021: 5 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 Massac 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 |
| Southeastern IL Elec Coop, Inc | 2021 | 2.2 hrs | 1.32 | 2.0 hrs | 1.25 |
| Southern Illinois Elec Coop | - | - | - | - | - |
| City of Metropolis - (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 ÷ 8,175 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. Massac County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Massac 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/massac-county