County annual report · FIPS 29189
2018 St. Louis County, MO Power Outage Report
In 2018, customers in St. Louis County, MO went without power for an average of 2.9 hours, a total of 1.7M customer-hours (Missouri average 1.7 hours). That ranks 27th worst of 96 Missouri counties and 1548th of 2,798 nationally.
Compared with MO, the US and 2017
Coverage line is EAGLE-I's share of Missouri customers tracked each year.
Biggest outages in St. Louis 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 | June 28, 2018 12:30 | July 3, 2018 11:45 | 4d 23h | 32,214 | 736K |
| 2 | July 12, 2018 11:00 | July 18, 2018 11:15 | 6d | 19,004 | 177K |
| 3 | February 14, 2018 09:00 | February 18, 2018 09:30 | 4d | 8,331 | 40K |
| 4 | August 5, 2018 13:30 | August 10, 2018 08:15 | 4d 18h | 6,684 | 18K |
| 5 | December 27, 2018 09:30 | December 28, 2018 09:45 | 1d | 5,743 | 22K |
| 6 | May 13, 2018 11:45 | May 18, 2018 08:45 | 4d 21h | 5,620 | 35K |
| 7 | July 19, 2018 11:30 | July 21, 2018 04:15 | 1d 16h | 5,295 | 9,225 |
| 8 | May 25, 2018 10:30 | May 30, 2018 03:00 | 4d 16h | 4,836 | 57K |
| 9 | November 28, 2018 10:00 | November 30, 2018 01:15 | 1d 15h | 4,418 | 7,378 |
| 10 | April 22, 2018 23:15 | April 23, 2018 10:45 | 11h 30m | 4,367 | 4,704 |
Outage episodes by size in 2018: 180 reached 100+ customers, 70 reached 1,000+ customers, 2 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. Louis 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 |
|---|---|---|---|---|---|
| Union Electric Co - (MO) | 2018 | 2.3 hrs | 0.85 | 86 min | 0.72 |
| Ameren | - | - | - | - | - |
| City of Kirkwood - (MO) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 80% of Missouri's customers in 2018; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 594,469 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. Louis County has data for 2015–2021, 2025.
Cite this report
MassOutage (massoutage.com), St. Louis County, MO 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/missouri/st-louis-county