County annual report · FIPS 29189
2021 St. Louis County, MO Power Outage Report
In 2021, customers in St. Louis County, MO went without power for an average of 0.1 hours, a total of 53K customer-hours (Missouri average 4.5 hours). That ranks 115th worst of 115 Missouri counties and 2925th of 2,974 nationally.
Compared with MO, the US and 2020
Coverage line is EAGLE-I's share of Missouri customers tracked each year.
Biggest outages in St. Louis County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | January 23, 2021 14:45 | January 27, 2021 20:15 | 4d 5h | 6,674 | 8,201 |
| 2 | January 1, 2021 05:45 | January 4, 2021 03:15 | 2d 21h | 2,384 | 27K |
| 3 | January 23, 2021 08:00 | January 23, 2021 11:45 | 3h 45m | 1,418 | 2,286 |
| 4 | January 29, 2021 14:45 | January 30, 2021 06:45 | 16h | 1,110 | 1,012 |
| 5 | January 17, 2021 14:15 | January 18, 2021 09:00 | 18h 45m | 410 | 400 |
| 6 | January 18, 2021 13:45 | January 19, 2021 02:00 | 12h 15m | 351 | 570 |
| 7 | January 30, 2021 16:45 | February 1, 2021 05:45 | 1d 13h | 338 | 2,998 |
| 8 | January 12, 2021 14:45 | January 13, 2021 04:00 | 13h 15m | 239 | 1,200 |
| 9 | January 13, 2021 13:15 | January 14, 2021 03:15 | 14h | 188 | 889 |
| 10 | January 8, 2021 13:30 | January 9, 2021 02:30 | 13h | 157 | 261 |
Outage episodes by size in 2021: 13 reached 100+ customers, 4 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 St. Louis County reported on EIA Form 861 for 2021, 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) | 2021 | 4.9 hrs | 1.02 | 1.5 hrs | 0.69 |
| City of Kirkwood - (MO) | 2021 | 26 min | 0.38 | 26 min | 0.38 |
| Ameren | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 95% of Missouri's customers in 2021; 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, 2021, 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/2021/missouri/st-louis-county