County annual report · FIPS 29183
2021 St. Charles County, MO Power Outage Report
In 2021, customers in St. Charles County, MO went without power for an average of 3.6 hours, a total of 651K customer-hours (Missouri average 4.5 hours). That ranks 58th worst of 115 Missouri counties and 1664th 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. Charles 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 | June 19, 2021 09:45 | June 23, 2021 05:00 | 3d 19h | 25,716 | 223K |
| 2 | December 11, 2021 00:30 | December 15, 2021 21:30 | 4d 21h | 12,221 | 55K |
| 3 | August 12, 2021 12:30 | August 16, 2021 01:00 | 3d 12h | 11,768 | 69K |
| 4 | July 9, 2021 23:30 | July 14, 2021 21:00 | 4d 21h | 9,200 | 112K |
| 5 | May 17, 2021 00:15 | May 17, 2021 09:45 | 9h 30m | 7,381 | 9,653 |
| 6 | April 22, 2021 13:15 | April 23, 2021 03:15 | 14h | 7,059 | 6,673 |
| 7 | June 26, 2021 19:15 | June 29, 2021 11:00 | 2d 15h | 6,111 | 8,159 |
| 8 | May 27, 2021 13:15 | May 27, 2021 23:45 | 10h 30m | 3,250 | 6,518 |
| 9 | February 4, 2021 20:45 | February 6, 2021 20:15 | 1d 23h | 2,993 | 2,377 |
| 10 | August 8, 2021 20:45 | August 10, 2021 02:00 | 1d 5h | 2,744 | 8,126 |
Outage episodes by size in 2021: 104 reached 100+ customers, 33 reached 1,000+ customers, 3 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. Charles 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 |
| Cuivre River Electric Coop Inc | 2021 | 6.2 hrs | 1.56 | 2.2 hrs | 1.02 |
| 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 ÷ 181,803 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. Charles County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), St. Charles 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-charles-county