County annual report · FIPS 12117
2021 Seminole County, FL Power Outage Report
In 2021, customers in Seminole County, FL went without power for an average of 1.9 hours, a total of 376K customer-hours (Florida average 1.9 hours). That ranks 43rd worst of 67 Florida counties and 2282nd of 2,974 nationally.
Compared with FL, the US and 2020
Coverage line is EAGLE-I's share of Florida customers tracked each year.
Biggest outages in Seminole 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 | May 24, 2021 06:00 | May 26, 2021 05:45 | 1d 23h | 12,974 | 5,713 |
| 2 | April 10, 2021 10:00 | April 12, 2021 05:30 | 1d 19h | 5,689 | 48K |
| 3 | March 18, 2021 09:15 | March 19, 2021 07:45 | 22h 30m | 5,033 | 10K |
| 4 | January 3, 2021 02:15 | January 3, 2021 06:30 | 4h 15m | 4,941 | 3,267 |
| 5 | March 16, 2021 11:45 | March 16, 2021 21:45 | 10h | 4,679 | 3,924 |
| 6 | September 13, 2021 06:15 | September 15, 2021 02:30 | 1d 20h | 3,896 | 4,493 |
| 7 | February 11, 2021 12:45 | February 12, 2021 03:15 | 14h 30m | 3,881 | 5,574 |
| 8 | June 22, 2021 12:00 | June 24, 2021 17:45 | 2d 5h | 3,592 | 15K |
| 9 | June 17, 2021 11:30 | June 18, 2021 06:15 | 18h 45m | 3,546 | 5,091 |
| 10 | May 29, 2021 11:30 | May 30, 2021 05:30 | 18h | 2,962 | 4,475 |
Outage episodes by size in 2021: 190 reached 100+ customers, 54 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 Seminole 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 |
|---|---|---|---|---|---|
| Florida Power & Light Co | 2021 | 55 min | 0.58 | 45 min | 0.51 |
| Duke Energy Florida, LLC | 2021 | 1.6 hrs | 1.04 | 90 min | 1.00 |
| Duke Energy | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 98% of Florida's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 201,776 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. Seminole County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Seminole County, FL 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/florida/seminole-county