County annual report · FIPS 29510
2025 St. Louis city, MO Power Outage Report
In 2025, customers in St. Louis city, MO went without power for an average of 36.7 hours, a total of 3.9M customer-hours (Missouri average 8.9 hours). That ranks 7th worst of 115 Missouri counties and 136th of 3,000 nationally.
Compared with MO, the US and 2024
Coverage line is EAGLE-I's share of Missouri customers tracked each year.
Biggest outages in St. Louis city, 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 | May 16, 2025 12:30 | June 1, 2025 12:45 | 16d | 40,596 | 3.4M |
| 2 | March 13, 2025 22:15 | March 19, 2025 04:00 | 5d 5h | 6,124 | 139K |
| 3 | March 4, 2025 10:30 | March 7, 2025 04:45 | 2d 18h | 5,709 | 46K |
| 4 | February 18, 2025 11:30 | February 21, 2025 01:15 | 2d 13h | 5,010 | 12K |
| 5 | December 18, 2025 13:00 | December 20, 2025 03:45 | 1d 14h | 4,484 | 16K |
| 6 | January 28, 2025 05:15 | January 28, 2025 08:15 | 3h | 4,215 | 3,164 |
| 7 | December 28, 2025 18:00 | December 31, 2025 05:30 | 2d 11h | 4,161 | 9,819 |
| 8 | June 1, 2025 15:00 | June 12, 2025 03:00 | 10d 12h | 3,737 | 19K |
| 9 | December 10, 2025 12:00 | December 11, 2025 10:30 | 22h 30m | 3,381 | 9,123 |
| 10 | January 10, 2025 07:30 | January 12, 2025 09:00 | 2d 1h | 2,944 | 5,380 |
Outage episodes by size in 2025: 142 reached 100+ customers, 23 reached 1,000+ customers, 1 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 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 |
| 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 ÷ 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, 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-city