County annual report · FIPS 36059
2020 Nassau County, NY Power Outage Report
In 2020, customers in Nassau County, NY went without power for an average of 32.9 hours, a total of 14.1M customer-hours (New York average 10.4 hours). That ranks 3rd worst of 62 New York counties and 248th of 3,019 nationally.
Compared with NY, the US and 2019
Coverage line is EAGLE-I's share of New York customers tracked each year.
Biggest outages in Nassau County, 2020
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 3, 2020 10:00 | August 24, 2020 05:15 | 20d 19h | 141,608 | 13.3M |
| 2 | November 15, 2020 21:45 | November 17, 2020 10:45 | 1d 13h | 9,540 | 39K |
| 3 | December 24, 2020 12:15 | December 31, 2020 00:15 | 6d 12h | 8,818 | 82K |
| 4 | March 16, 2020 11:45 | March 17, 2020 02:00 | 14h 15m | 7,701 | 8,006 |
| 5 | April 13, 2020 06:45 | April 15, 2020 10:00 | 2d 3h | 7,227 | 49K |
| 6 | July 9, 2020 09:30 | July 24, 2020 05:45 | 14d 20h | 6,261 | 97K |
| 7 | May 26, 2020 05:45 | May 27, 2020 04:15 | 22h 30m | 4,850 | 3,740 |
| 8 | December 9, 2020 12:45 | December 10, 2020 11:30 | 22h 45m | 4,709 | 4,640 |
| 9 | August 27, 2020 07:30 | August 29, 2020 06:15 | 1d 22h | 4,690 | 14K |
| 10 | November 30, 2020 13:15 | December 2, 2020 06:15 | 1d 17h | 4,545 | 19K |
Outage episodes by size in 2020: 190 reached 100+ customers, 60 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 Nassau County reported on EIA Form 861 for 2020, 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) | 2020 | 60 min | 0.70 | 13 min | 0.23 |
| 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 99% of New York's customers in 2020; 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, 2020, 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/2020/new-york/nassau-county