County annual report · FIPS 10005
2025 Sussex County, DE Power Outage Report
In 2025, customers in Sussex County, DE went without power for an average of 1.7 hours, a total of 372K customer-hours (Delaware average 2.4 hours). That ranks 2nd worst of 3 Delaware counties and 2538th of 3,000 nationally.
Compared with DE, the US and 2024
Coverage line is EAGLE-I's share of Delaware customers tracked each year.
Biggest outages in Sussex County, 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 | July 25, 2025 04:15 | July 26, 2025 04:00 | 23h 45m | 11,053 | 26K |
| 2 | January 29, 2025 00:15 | January 29, 2025 03:15 | 3h | 10,066 | 30K |
| 3 | December 14, 2025 16:00 | December 15, 2025 05:45 | 13h 45m | 8,701 | 5,825 |
| 4 | July 29, 2025 10:15 | July 30, 2025 04:45 | 18h 30m | 6,856 | 4,063 |
| 5 | July 8, 2025 11:00 | July 9, 2025 10:45 | 23h 45m | 6,274 | 9,165 |
| 6 | May 16, 2025 20:15 | May 19, 2025 04:45 | 2d 8h | 5,814 | 24K |
| 7 | September 25, 2025 13:45 | September 26, 2025 02:15 | 12h 30m | 4,901 | 12K |
| 8 | August 3, 2025 12:15 | August 4, 2025 00:00 | 11h 45m | 4,222 | 8,311 |
| 9 | September 11, 2025 07:15 | September 11, 2025 17:45 | 10h 30m | 4,099 | 4,649 |
| 10 | April 12, 2025 04:30 | April 13, 2025 00:00 | 19h 30m | 3,326 | 8,317 |
Outage episodes by size in 2025: 166 reached 100+ customers, 35 reached 1,000+ customers, 2 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 Sussex County 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 |
|---|---|---|---|---|---|
| Delmarva Power | 2024 | 1.7 hrs | 0.73 | 62 min | 0.61 |
| Delaware Electric Cooperative | 2024 | 1.6 hrs | 1.11 | 61 min | 0.94 |
| City of Milford - (DE) | - | - | - | - | - |
| City of Lewes - (DE) | - | - | - | - | - |
| City of Seaford- (DE) | - | - | - | - | - |
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 Delaware's customers in 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 218,986 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. Sussex County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Sussex County, DE 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/delaware/sussex-county