County annual report · FIPS 17163
2015 St. Clair County, IL Power Outage Report
In 2015, customers in St. Clair County, IL went without power for an average of 3.1 hours, a total of 292K customer-hours (Illinois average 2.3 hours). That ranks 30th worst of 100 Illinois counties and 884th 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 St. Clair 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 | June 20, 2015 21:00 | June 29, 2015 09:00 | 8d 12h | 14,467 | 149K |
| 2 | November 17, 2015 20:30 | November 18, 2015 15:00 | 18h 30m | 3,532 | 7,762 |
| 3 | June 8, 2015 03:30 | June 8, 2015 22:00 | 18h 30m | 2,515 | 7,689 |
| 4 | May 10, 2015 22:30 | May 12, 2015 01:45 | 1d 3h | 2,167 | 8,117 |
| 5 | July 9, 2015 11:00 | July 13, 2015 12:00 | 4d 1h | 2,094 | 5,009 |
| 6 | September 12, 2015 12:00 | September 12, 2015 21:00 | 9h | 2,086 | 6,500 |
| 7 | August 5, 2015 11:00 | August 7, 2015 04:45 | 1d 17h | 1,970 | 2,061 |
| 8 | June 10, 2015 12:15 | June 11, 2015 10:00 | 21h 45m | 1,915 | 1,241 |
| 9 | June 16, 2015 10:30 | June 17, 2015 23:30 | 1d 13h | 1,614 | 5,485 |
| 10 | June 18, 2015 17:00 | June 19, 2015 11:00 | 18h | 1,589 | 2,572 |
Outage episodes by size in 2015: 69 reached 100+ customers, 19 reached 1,000+ customers, 1 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 St. Clair 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 |
| Southwestern Electric Coop Inc - (IL) | 2015 | 2.7 hrs | 1.63 | 2.4 hrs | 1.50 |
| Tri-County Electric Coop, Inc (IL) | 2015 | 2.7 hrs | 2.00 | 2.0 hrs | 1.50 |
| Monroe County Elec Coop, Inc | 2015 | 3.7 hrs | 0.03 | 3.7 hrs | 0.03 |
| Ameren | - | - | - | - | - |
| Egyptian Electric Coop Assn | - | - | - | - | - |
| Clinton County Elec Coop, Inc | - | - | - | - | - |
| City of Highland | - | - | - | - | - |
| City of Mascoutah - (IL) | - | - | - | - | - |
| Village of Freeburg - (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 2015; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 94,355 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. St. Clair County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), St. Clair 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/st-clair-county