County annual report · FIPS 29510
2021 St. Louis city, MO Power Outage Report
In 2021, customers in St. Louis city, MO went without power for an average of 37.9 hours, a total of 4.0M customer-hours (Missouri average 4.5 hours). That ranks 3rd worst of 115 Missouri counties and 234th 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 city, 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 | August 6, 2021 11:15 | August 22, 2021 06:00 | 15d 18h | 69,559 | 1.4M |
| 2 | July 4, 2021 12:15 | August 4, 2021 07:45 | 30d 19h | 40,765 | 1.4M |
| 3 | June 17, 2021 11:00 | July 1, 2021 06:15 | 13d 19h | 17,892 | 504K |
| 4 | May 4, 2021 11:30 | May 7, 2021 08:00 | 2d 20h | 14,394 | 15K |
| 5 | November 23, 2021 10:00 | November 24, 2021 10:30 | 1d | 8,701 | 15K |
| 6 | February 7, 2021 08:45 | February 8, 2021 00:45 | 16h | 8,501 | 4,763 |
| 7 | August 22, 2021 07:15 | September 6, 2021 23:15 | 15d 16h | 8,136 | 153K |
| 8 | December 5, 2021 06:15 | December 7, 2021 09:00 | 2d 2h | 6,658 | 17K |
| 9 | September 22, 2021 12:15 | September 23, 2021 06:45 | 18h 30m | 5,199 | 5,512 |
| 10 | December 21, 2021 14:45 | December 23, 2021 10:15 | 1d 19h | 4,984 | 18K |
Outage episodes by size in 2021: 136 reached 100+ customers, 44 reached 1,000+ customers, 4 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 city 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 |
| 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 ÷ 106,898 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 city has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), St. Louis city, 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-city