County annual report · FIPS 36059
2025 Nassau County, NY Power Outage Report
In 2025, customers in Nassau County, NY went without power for an average of 1.8 hours, a total of 754K customer-hours (New York average 2.4 hours). That ranks 52nd worst of 62 New York counties and 2512th of 3,000 nationally.
Compared with NY, the US and 2024
Coverage line is EAGLE-I's share of New York customers tracked each year.
Biggest outages in Nassau 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 | February 2, 2025 14:00 | February 3, 2025 00:45 | 10h 45m | 457,901 | 115K |
| 2 | December 19, 2025 10:30 | December 21, 2025 07:00 | 1d 20h | 10,819 | 61K |
| 3 | April 26, 2025 09:15 | April 27, 2025 09:00 | 23h 45m | 10,661 | 8,316 |
| 4 | January 7, 2025 11:45 | January 8, 2025 07:30 | 19h 45m | 5,276 | 6,241 |
| 5 | December 29, 2025 08:15 | January 1, 2026 00:00 | 2d 15h | 5,211 | 13K |
| 6 | July 8, 2025 07:30 | July 12, 2025 00:00 | 3d 16h | 3,542 | 13K |
| 7 | October 30, 2025 05:45 | November 2, 2025 06:15 | 3d | 3,509 | 28K |
| 8 | September 9, 2025 09:45 | September 10, 2025 03:00 | 17h 15m | 3,272 | 1,360 |
| 9 | January 28, 2025 10:30 | January 29, 2025 04:30 | 18h | 2,872 | 2,163 |
| 10 | September 16, 2025 11:15 | September 16, 2025 22:00 | 10h 45m | 2,851 | 1,902 |
Outage episodes by size in 2025: 272 reached 100+ customers, 66 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 Nassau 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 |
|---|---|---|---|---|---|
| Village of Freeport - (NY) | 2024 | 27 min | 1.15 | 7 min | 0.14 |
| Long Island Power Authority | - | - | - | - | - |
| Village of Rockville Centre - (NY) | - | - | - | - | - |
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 New York's customers in 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 427,483 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. Nassau County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Nassau County, NY 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/new-york/nassau-county