County annual report · FIPS 17125
2018 Mason County, IL Power Outage Report
In 2018, customers in Mason County, IL went without power for an average of 2.2 hours, a total of 10K customer-hours (Illinois average 2.5 hours). That ranks 57th worst of 102 Illinois counties and 1803rd of 2,798 nationally.
Compared with IL, the US and 2017
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Mason County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 20, 2018 18:15 | October 21, 2018 01:30 | 7h 15m | 681 | 1,072 |
| 2 | October 28, 2018 17:45 | October 28, 2018 20:30 | 2h 45m | 669 | 841 |
| 3 | July 25, 2018 13:30 | July 25, 2018 20:45 | 7h 15m | 547 | 335 |
| 4 | August 29, 2018 15:30 | August 29, 2018 21:30 | 6h | 469 | 1,178 |
| 5 | June 16, 2018 09:00 | June 16, 2018 11:15 | 2h 15m | 460 | 691 |
| 6 | June 28, 2018 21:15 | June 29, 2018 09:00 | 11h 45m | 318 | 3,117 |
| 7 | June 29, 2018 15:30 | June 29, 2018 18:30 | 3h | 227 | 229 |
| 8 | July 16, 2018 20:30 | July 16, 2018 21:00 | 30m | 227 | 58 |
| 9 | December 1, 2018 21:30 | December 2, 2018 19:15 | 21h 45m | 177 | 132 |
| 10 | October 10, 2018 09:00 | October 10, 2018 10:00 | 1h | 129 | 129 |
Outage episodes by size in 2018: 10 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 Mason County reported on EIA Form 861 for 2018, 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 | 2018 | 3.5 hrs | 1.06 | 1.8 hrs | 0.90 |
| Menard Electric Coop | 2018 | 2.9 hrs | 1.75 | 2.9 hrs | 1.75 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 92% of Illinois's customers in 2018; 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, 2018, 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/2018/illinois/mason-county