County annual report · FIPS 29189
2025 St. Louis County, MO Power Outage Report
In 2025, customers in St. Louis County, MO went without power for an average of 9.1 hours, a total of 5.4M customer-hours (Missouri average 8.9 hours). That ranks 41st worst of 115 Missouri counties and 879th of 3,000 nationally.
Compared with MO, the US and 2021
Coverage line is EAGLE-I's share of Missouri customers tracked each year.
Biggest outages in St. Louis County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 12, 2025 13:45 | March 20, 2025 06:30 | 7d 16h | 83,830 | 2.4M |
| 2 | May 14, 2025 11:00 | June 1, 2025 02:00 | 17d 15h | 47,245 | 1.7M |
| 3 | June 15, 2025 11:45 | June 29, 2025 06:30 | 13d 18h | 9,157 | 199K |
| 4 | July 26, 2025 10:15 | August 4, 2025 02:15 | 8d 16h | 7,786 | 56K |
| 5 | May 3, 2025 07:15 | May 10, 2025 05:15 | 6d 22h | 7,329 | 28K |
| 6 | June 29, 2025 10:15 | July 15, 2025 11:00 | 16d | 6,596 | 108K |
| 7 | April 27, 2025 01:30 | April 27, 2025 08:30 | 7h | 5,201 | 8,937 |
| 8 | October 28, 2025 12:15 | October 31, 2025 06:45 | 2d 18h | 4,928 | 23K |
| 9 | March 20, 2025 07:15 | March 20, 2025 20:30 | 13h 15m | 4,575 | 24K |
| 10 | November 23, 2025 12:15 | November 25, 2025 04:15 | 1d 16h | 4,435 | 10K |
Outage episodes by size in 2025: 84 reached 100+ customers, 40 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 2025, 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) | 2024 | 2.5 hrs | 0.77 | 1.6 hrs | 0.67 |
| City of Kirkwood - (MO) | 2024 | 2.8 hrs | 1.29 | 2.2 hrs | 1.06 |
| 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 n/a of Missouri's customers in 2025; 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, 2025, 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/2025/missouri/st-louis-county