NSTAR Electric Company: power outages per year
In 2025 the average NSTAR Electric Company customer was without power for 1.9 hours, close to the Massachusetts average of 2.0 h; up from 1.3 h in 2024. The utility served 1,463,349 customers in Massachusetts and ranks #2 of 2 large Massachusetts utilities by outage hours.
By year
| Year | Hours (with major events) | Hours (without) | Interruptions | Customers |
|---|---|---|---|---|
| 2025 | 1.9 | 1.1 | 0.8 | 1,463,349 |
| 2024 | 1.3 | 1.1 | 0.7 | 1,462,127 |
| 2023 | 3.2 | 1.3 | 0.9 | 1,307,124 |
| 2022 | 3.3 | 1.1 | 1.0 | 1,471,114 |
| 2021 | 10.7 | 1.3 | 1.1 | 1,450,541 |
| 2020 | 3.9 | 1.1 | 1.1 | 1,446,211 |
"With major events" includes storm days that utilities may exclude from their own reliability targets; it is what customers actually live through. The gap between the two columns shows how much of the year's outage time came from big storms.
Backup power for NSTAR Electric Company outages
An average outage here lasted about 2.3 hours in 2025. Size backup for the longest outage you want to ride through, not the average.
Other large utilities in Massachusetts
FAQ
How many hours a year are NSTAR Electric Company customers without power?
1.9 hours per customer in 2025 including major event days (1.1 h without them), as NSTAR Electric Company reported to the U.S. EIA.
How long does a typical NSTAR Electric Company outage last?
About 2.3 hours on average in 2025 (total outage minutes divided by the number of interruptions). Storms make single events much longer.
Source: U.S. EIA Form 861, Reliability file, 2020–2025. Data snapshot . Utilities ranked nationwide →