County annual report · FIPS 36045
2021 Jefferson County, NY Power Outage Report
In 2021, customers in Jefferson County, NY went without power for an average of 3.3 hours, a total of 206K customer-hours (New York average 2.7 hours). That ranks 44th worst of 62 New York counties and 1743rd of 2,974 nationally.
Compared with NY, the US and 2020
Coverage line is EAGLE-I's share of New York 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 | July 6, 2021 02:15 | July 7, 2021 00:00 | 21h 45m | 8,529 | 15K |
| 2 | December 11, 2021 21:30 | December 15, 2021 02:15 | 3d 4h | 6,028 | 105K |
| 3 | January 17, 2021 04:15 | January 18, 2021 00:15 | 20h | 4,890 | 14K |
| 4 | May 21, 2021 14:45 | May 22, 2021 08:45 | 18h | 3,237 | 2,632 |
| 5 | April 16, 2021 00:00 | April 16, 2021 00:15 | 15m | 2,597 | 649 |
| 6 | August 19, 2021 08:15 | August 19, 2021 10:15 | 2h | 2,355 | 4,710 |
| 7 | July 20, 2021 18:45 | July 21, 2021 01:45 | 7h | 2,262 | 1,256 |
| 8 | October 26, 2021 20:00 | October 27, 2021 08:00 | 12h | 2,211 | 569 |
| 9 | August 21, 2021 08:15 | August 21, 2021 08:30 | 15m | 2,193 | 548 |
| 10 | November 12, 2021 02:15 | November 12, 2021 23:15 | 21h | 2,116 | 2,158 |
Outage episodes by size in 2021: 62 reached 100+ customers, 18 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 |
|---|---|---|---|---|---|
| Niagara Mohawk Power Corp. | 2021 | 3.7 hrs | 1.32 | 2.2 hrs | 1.12 |
| Village of Philadelphia - (NY) | - | - | - | - | - |
| Village of Theresa - (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 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 62,240 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, NY 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/new-york/jefferson-county