County annual report · FIPS 17125
2023 Mason County, IL Power Outage Report
In 2023, customers in Mason County, IL went without power for an average of 2.1 hours, a total of 10K customer-hours (Illinois average 4.0 hours). That ranks 78th worst of 102 Illinois counties and 2238th of 2,977 nationally.
Compared with IL, the US and 2022
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Mason County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 14, 2023 09:15 | December 14, 2023 09:45 | 30m | 1,475 | 738 |
| 2 | August 26, 2023 00:45 | August 26, 2023 11:45 | 11h | 802 | 3,127 |
| 3 | October 18, 2023 10:30 | October 18, 2023 11:15 | 45m | 785 | 395 |
| 4 | January 6, 2023 22:30 | January 7, 2023 01:30 | 3h | 665 | 1,128 |
| 5 | January 26, 2023 18:15 | January 26, 2023 18:45 | 30m | 654 | 327 |
| 6 | April 10, 2023 14:45 | April 10, 2023 15:45 | 1h | 437 | 224 |
| 7 | September 17, 2023 00:30 | September 17, 2023 03:00 | 2h 30m | 121 | 254 |
| 8 | May 15, 2023 04:00 | May 15, 2023 21:15 | 17h 15m | 87 | 1,429 |
| 9 | June 11, 2023 17:30 | June 12, 2023 01:30 | 8h | 52 | 108 |
| 10 | June 29, 2023 17:15 | July 4, 2023 15:00 | 4d 21h | 50 | 288 |
Outage episodes by size in 2023: 7 reached 100+ customers, 1 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 Mason County reported on EIA Form 861 for 2023, 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 | 2023 | 9.9 hrs | 1.33 | 1.9 hrs | 0.82 |
| Menard Electric Coop | 2023 | 7.4 hrs | 2.47 | 1.6 hrs | 1.46 |
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 2023; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 4,847 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. Mason County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Mason County, IL annual power outage report, 2023, 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/2023/illinois/mason-county