Ontario County Power Outage History
2014–2025 · New York
Better than average — fewer or shorter outages than most counties. 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 | 47,792 (63%) | Unnamed event |
| Dec 10, 2020 | 1 hrs | 21,726 (29%) | Unnamed event |
| Dec 23, 2022 | 45 hrs | 8,873 (12%) | Winter Storm Elliott |
| May 25, 2017 | 1 hrs | 8,620 (11%) | Hail |
| Jun 23, 2015 | 0 hrs | 7,799 (10%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Ontario County recorded 921 distinct power outage events, averaging 2.4 hours per event.
The single worst outage on record in Ontario County started July 10, 2018, lasting 0 hours and leaving up to 47,792 customers without power (63% of the county) at its peak.
June has historically been the worst month for outages in Ontario County, with 129 events recorded during that month across the dataset.
Based on this history, Ontario County earns a Reliability Grade of B, placing it in the 71st percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Ontario County's outage profile
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Outage-prep kit
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Similar counties in New York
Counties with the closest reliability grade and national percentile to Ontario County.
| County | Grade | National percentile |
|---|---|---|
| Onondaga County | B | 76th |
| Chautauqua County | B | 64th |
| Tompkins County | B | 61st |
| Livingston County | C | 60th |
| Erie County | C | 59th |
FAQ
How often does power go out in Ontario County?
Between 2014 and 2025, Ontario County recorded 921 outage events, averaging 2.4 hours each.
What is Ontario County's reliability grade?
Ontario County has a Reliability Grade of B, in the 71st national percentile.
What was the worst power outage in Ontario County?
The worst outage on record started July 10, 2018, lasting 0 hours and affecting up to 47,792 customers.