Tolland County Power Outage History
2014–2025 · Connecticut
Worse than average — more frequent or longer 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 |
|---|---|---|---|
| Aug 4, 2020 | 148 hrs | 40,984 (51%) | Tropical Storm Isaias |
| Oct 29, 2017 | 53 hrs | 27,269 (34%) | Unnamed event |
| Dec 18, 2023 | 41 hrs | 15,786 (20%) | Unnamed event |
| Feb 25, 2016 | 17 hrs | 14,740 (18%) | High Wind |
| Oct 17, 2019 | 45 hrs | 11,252 (14%) | Unnamed event |
Over the 12 years from 2014 to 2025, Tolland County recorded 845 distinct power outage events, averaging 2.8 hours per event.
The single worst outage on record in Tolland County started August 4, 2020 (Tropical Storm Isaias), lasting 148 hours and leaving up to 40,984 customers without power (51% of the county) at its peak.
July has historically been the worst month for outages in Tolland County, with 107 events recorded during that month across the dataset.
Based on this history, Tolland County earns a Reliability Grade of D, placing it in the 26th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Tolland County's outage profile
See more picks in our Best Dual-Fuel Portable Generators for Power Outages roundup.
Champion Power Equipment 4375-Watt Dual Fuel RV Ready Portable Generator with Free 3-Year Warranty
Outage-prep kit
See our outage-prep guides.
Similar counties in Connecticut
Counties with the closest reliability grade and national percentile to Tolland County.
| County | Grade | National percentile |
|---|---|---|
| Middlesex County | D | 21st |
| Fairfield County | F | 19th |
| New London County | F | 19th |
| Litchfield County | F | 18th |
| Windham County | F | 15th |
FAQ
How often does power go out in Tolland County?
Between 2014 and 2025, Tolland County recorded 845 outage events, averaging 2.8 hours each.
What is Tolland County's reliability grade?
Tolland County has a Reliability Grade of D, in the 26th national percentile.
What was the worst power outage in Tolland County?
The worst outage on record started August 4, 2020 (Tropical Storm Isaias), lasting 148 hours and affecting up to 40,984 customers.