County annual report · FIPS 21111
2021 Jefferson County, KY Power Outage Report
In 2021, customers in Jefferson County, KY went without power for an average of 1.7 hours, a total of 660K customer-hours (Kentucky average 10.4 hours). That ranks 106th worst of 119 Kentucky counties and 2366th of 2,974 nationally.
Compared with KY, the US and 2020
Coverage line is EAGLE-I's share of Kentucky 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 | January 24, 2021 16:00 | January 24, 2021 19:30 | 3h 30m | 9,673 | 2,605 |
| 2 | June 11, 2021 20:15 | June 16, 2021 05:30 | 4d 9h | 9,612 | 38K |
| 3 | December 11, 2021 04:00 | December 15, 2021 02:00 | 3d 22h | 8,586 | 86K |
| 4 | February 10, 2021 19:15 | February 12, 2021 20:15 | 2d 1h | 7,888 | 34K |
| 5 | October 28, 2021 13:30 | October 29, 2021 00:00 | 10h 30m | 6,725 | 1,858 |
| 6 | March 1, 2021 12:45 | April 9, 2021 03:15 | 38d 14h | 6,217 | 63K |
| 7 | May 15, 2021 10:45 | May 15, 2021 22:30 | 11h 45m | 6,000 | 5,598 |
| 8 | December 2, 2021 13:45 | December 3, 2021 03:30 | 13h 45m | 5,730 | 3,187 |
| 9 | October 13, 2021 13:00 | October 14, 2021 04:15 | 15h 15m | 4,726 | 18K |
| 10 | August 25, 2021 11:00 | August 28, 2021 22:00 | 3d 11h | 4,606 | 24K |
Outage episodes by size in 2021: 208 reached 100+ customers, 57 reached 1,000+ customers, 0 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 |
|---|---|---|---|---|---|
| Salt River Electric Coop Corp | 2021 | 2.5 hrs | 1.26 | 1.5 hrs | 0.98 |
| Shelby Energy Coop, Inc - (KY) | 2021 | 2.0 hrs | 1.00 | 2.0 hrs | 1.00 |
| Louisville Gas & Electric Co | 2021 | 1.7 hrs | 0.95 | 79 min | 0.89 |
| Kentucky (statewide) | - | - | - | - | - |
| LG&E and KU | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 92% of Kentucky's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 390,033 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, KY 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/kentucky/jefferson-county