County annual report · FIPS 17125
2015 Mason County, IL Power Outage Report
In 2015, customers in Mason County, IL went without power for an average of 6.0 hours, a total of 29K customer-hours (Illinois average 2.3 hours). That ranks 17th worst of 100 Illinois counties and 467th of 2,484 nationally.
Compared with IL, the US
Coverage line is EAGLE-I's share of Illinois customers tracked each year.
Biggest outages in Mason County, 2015
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | April 22, 2015 04:45 | April 22, 2015 06:45 | 2h | 1,007 | 671 |
| 2 | July 16, 2015 23:00 | July 18, 2015 03:45 | 1d 4h | 994 | 9,736 |
| 3 | August 5, 2015 04:30 | August 29, 2015 20:00 | 24d 15h | 710 | 4,210 |
| 4 | April 19, 2015 21:00 | April 20, 2015 02:45 | 5h 45m | 684 | 1,715 |
| 5 | August 30, 2015 18:45 | September 3, 2015 21:45 | 4d 3h | 543 | 1,656 |
| 6 | May 15, 2015 22:30 | May 15, 2015 23:30 | 1h | 469 | 353 |
| 7 | July 7, 2015 03:15 | July 7, 2015 04:45 | 1h 30m | 469 | 704 |
| 8 | September 8, 2015 23:30 | September 9, 2015 00:00 | 30m | 442 | 112 |
| 9 | May 10, 2015 23:30 | May 13, 2015 02:45 | 2d 3h | 363 | 710 |
| 10 | July 19, 2015 03:00 | August 4, 2015 17:45 | 16d 14h | 303 | 824 |
Outage episodes by size in 2015: 17 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 2015, 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 | 2015 | 5.9 hrs | 1.39 | 2.2 hrs | 1.04 |
| Menard Electric Coop | - | - | - | - | - |
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 2015; 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, 2015, 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/2015/illinois/mason-county