Sullivan County Power Outage History
2014–2025 · New York
Bottom 20% least reliable nationally — frequent and/or long outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jul 10, 2018 | 0 hrs | 45,694 (78%) | Unnamed event |
| Sep 2, 2015 | 4 hrs | 44,453 (76%) | Unnamed event |
| Aug 21, 2015 | 8 hrs | 39,715 (68%) | Unnamed event |
| Mar 2, 2018 | 83 hrs | 30,056 (51%) | Blizzard |
| May 15, 2018 | 124 hrs | 20,189 (34%) | Hail |
Over the 12 years from 2014 to 2025, Sullivan County recorded 1,376 distinct power outage events, averaging 3.6 hours per event.
The single worst outage on record in Sullivan County started July 10, 2018, lasting 0 hours and leaving up to 45,694 customers without power (78% of the county) at its peak.
July has historically been the worst month for outages in Sullivan County, with 181 events recorded during that month across the dataset.
Based on this history, Sullivan County earns a Reliability Grade of F, placing it in the 10th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in New York
Counties with the closest reliability grade and national percentile to Sullivan County.
| County | Grade | National percentile |
|---|---|---|
| Ulster County | F | 10th |
| Warren County | F | 11th |
| Chenango County | F | 12th |
| Essex County | F | 13th |
| Columbia County | F | 13th |
FAQ
How often does power go out in Sullivan County?
Between 2014 and 2025, Sullivan County recorded 1,376 outage events, averaging 3.6 hours each.
What is Sullivan County's reliability grade?
Sullivan County has a Reliability Grade of F, in the 10th national percentile.
What was the worst power outage in Sullivan County?
The worst outage on record started July 10, 2018, lasting 0 hours and affecting up to 45,694 customers.