County annual report · FIPS 29099
2021 Jefferson County, MO Power Outage Report
In 2021, customers in Jefferson County, MO went without power for an average of 2.7 hours, a total of 293K customer-hours (Missouri average 4.5 hours). That ranks 71st worst of 115 Missouri counties and 1957th 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 Jefferson 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 | August 12, 2021 23:45 | August 15, 2021 20:30 | 2d 20h | 11,138 | 118K |
| 2 | June 19, 2021 23:15 | June 22, 2021 02:45 | 2d 3h | 3,353 | 17K |
| 3 | November 18, 2021 15:00 | November 18, 2021 16:45 | 1h 45m | 2,913 | 2,524 |
| 4 | August 23, 2021 13:30 | August 25, 2021 02:15 | 1d 12h | 1,740 | 5,517 |
| 5 | January 10, 2021 18:30 | January 10, 2021 19:15 | 45m | 1,661 | 422 |
| 6 | April 17, 2021 05:15 | April 17, 2021 13:45 | 8h 30m | 1,566 | 7,003 |
| 7 | August 29, 2021 15:00 | August 30, 2021 00:15 | 9h 15m | 1,520 | 1,188 |
| 8 | July 25, 2021 04:15 | July 26, 2021 00:30 | 20h 15m | 1,406 | 1,661 |
| 9 | October 15, 2021 13:45 | October 16, 2021 07:45 | 18h | 1,335 | 1,182 |
| 10 | November 19, 2021 03:15 | November 19, 2021 07:30 | 4h 15m | 1,256 | 1,918 |
Outage episodes by size in 2021: 92 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 Jefferson 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 |
| Crawford Electric Coop, Inc | 2021 | 3.4 hrs | 1.52 | 3.4 hrs | 1.52 |
| Citizens Electric Corporation - (MO) | 2021 | 3.1 hrs | 0.86 | 72 min | 0.63 |
| 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 ÷ 108,266 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. Jefferson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Jefferson 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/jefferson-county