County annual report · FIPS 29189
2020 St. Louis County, MO Power Outage Report
In 2020, customers in St. Louis County, MO went without power for an average of 0.6 hours, a total of 345K customer-hours (Missouri average 2.8 hours). That ranks 112th worst of 115 Missouri counties and 2805th of 3,019 nationally.
Compared with MO, the US and 2019
Coverage line is EAGLE-I's share of Missouri customers tracked each year.
Biggest outages in St. Louis County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 23, 2020 12:30 | December 29, 2020 01:15 | 5d 12h | 8,652 | 27K |
| 2 | December 9, 2020 09:15 | December 11, 2020 07:15 | 1d 22h | 6,734 | 9,557 |
| 3 | April 6, 2020 10:00 | April 8, 2020 03:30 | 1d 17h | 5,316 | 7,861 |
| 4 | March 1, 2020 19:30 | March 3, 2020 04:15 | 1d 8h | 5,173 | 7,871 |
| 5 | January 27, 2020 13:15 | January 28, 2020 03:00 | 13h 45m | 4,671 | 6,317 |
| 6 | May 4, 2020 06:45 | May 6, 2020 02:15 | 1d 19h | 4,626 | 27K |
| 7 | January 17, 2020 10:30 | January 19, 2020 07:45 | 1d 21h | 3,976 | 28K |
| 8 | November 12, 2020 13:00 | November 13, 2020 09:00 | 20h | 2,735 | 2,528 |
| 9 | April 8, 2020 13:00 | April 11, 2020 05:45 | 2d 16h | 2,029 | 14K |
| 10 | March 9, 2020 12:30 | March 12, 2020 05:30 | 2d 17h | 1,858 | 17K |
Outage episodes by size in 2020: 102 reached 100+ customers, 22 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 2020, 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) | 2020 | 2.6 hrs | 0.86 | 86 min | 0.71 |
| City of Kirkwood - (MO) | 2020 | 26 min | 0.27 | 25 min | 0.24 |
| 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 2020; 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, 2020, 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/2020/missouri/st-louis-county