County annual report · FIPS 17127
2025 Massac County, IL Power Outage Report
In 2025, customers in Massac County, IL went without power for an average of 0.6 hours, a total of 4,774 customer-hours (Illinois average 2.5 hours). That ranks 98th worst of 102 Illinois counties and 2853rd of 3,000 nationally.
Compared with IL, the US and 2024
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Massac County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 29, 2025 03:30 | July 29, 2025 10:15 | 6h 45m | 728 | 2,372 |
| 2 | June 15, 2025 14:30 | June 15, 2025 15:00 | 30m | 727 | 364 |
| 3 | June 6, 2025 19:45 | June 6, 2025 20:15 | 30m | 726 | 363 |
| 4 | October 15, 2025 16:45 | October 15, 2025 18:00 | 1h 15m | 606 | 679 |
| 5 | May 17, 2025 00:45 | May 17, 2025 02:15 | 1h 30m | 136 | 172 |
| 6 | November 26, 2025 21:00 | November 27, 2025 00:15 | 3h 15m | 101 | 328 |
| 7 | March 5, 2025 17:00 | March 5, 2025 17:30 | 30m | 38 | 19 |
| 8 | May 1, 2025 12:45 | May 1, 2025 13:00 | 15m | 33 | 8 |
| 9 | December 14, 2025 14:30 | December 14, 2025 15:45 | 1h 15m | 24 | 30 |
| 10 | May 16, 2025 11:30 | May 16, 2025 19:30 | 8h | 15 | 52 |
Outage episodes by size in 2025: 6 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 2025, 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 | 2024 | 3.7 hrs | 1.13 | 2.0 hrs | 0.91 |
| Southeastern IL Elec Coop, Inc | 2024 | 10.0 hrs | 3.07 | 2.3 hrs | 1.50 |
| 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 n/a of Illinois's customers in 2025; 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, 2025, 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/2025/illinois/massac-county