How reliable is NSTAR Electric Company?

NSTAR Electric Company customers averaged 1.3 hours without power in 2024 (SAIDI), which is about average and better than the US average, better than the Massachusetts median (1.7 h), per official US EIA data.

Where does NSTAR Electric Company rank among US electric utilities?

By official EIA SAIDI, NSTAR Electric Company is #55 of 468 US utilities by reliability that report reliability and serve at least three counties, #1 being the most reliable. Overall it is better than the US average.

How many customers does NSTAR Electric Company serve?

NSTAR Electric Company serves 11 counties across Massachusetts, per its EIA-861 service territory filing.

Where does NSTAR Electric Company provide power?

NSTAR Electric Company operates in Massachusetts. The full list of counties served is below, each linked to its live outage status.

NSTAR Electric Company: Outages & Reliability

As of October 7, 2026 09:00 UTC, about 250 NSTAR Electric Company customers are without power in 2 counties.

NSTAR Electric Company is an investor owned utility serving 11 counties in Massachusetts. In 2024, its customers went an average of 1.3 hours without power (SAIDI), across about 0.7 interruptions each. That ranks it #55 of 468 US utilities by reliability, where #1 is the most reliable. Its outage duration is better than the US average and better than the Massachusetts median (1.7 h).

SCATTERED OUTAGES · ON ITS NETWORKLive · total only

250

NSTAR Electric Company customers out in 2 counties

Official reliability (EIA 2024)

US EIA

1.3 hrs

SAIDI / customer / yr

0.7

SAIFI / yr

1.9 hrs

CAIDI / outage

better than the US average (US 11.0h)

Ranks #55 of 468 US utilities by reliability (#1 = most reliable) · better than the Massachusetts median (1.7 h).

Residential price29.9¢/kWhaverage, US EIA 2024energy trends →

Reliability over time

Official EIA SAIDI, hours without power per customer per year (IEEE, incl. major events). Over this period NSTAR Electric Company’s reliability has been improving (lower is better).

Outage trend · NSTAR Electric Company

250customers out · peak 646

Data as of Oct 7, 2026 09:00 UTC

Times in EDT. Shaded stretches had no reading.

Counties served by NSTAR Electric Company (11)

Service territory reported to EIA-861; each links to live outage status and history.

NSTAR Electric Company: FAQ

How reliable is NSTAR Electric Company?: NSTAR Electric Company customers averaged 1.3 hours without power in 2024 (SAIDI), which is about average and better than the US average, better than the Massachusetts median (1.7 h), per official US EIA data.
Where does NSTAR Electric Company rank among US electric utilities?: By official EIA SAIDI, NSTAR Electric Company is #55 of 468 US utilities by reliability that report reliability and serve at least three counties, #1 being the most reliable. Overall it is better than the US average.
How many customers does NSTAR Electric Company serve?: NSTAR Electric Company serves 11 counties across Massachusetts, per its EIA-861 service territory filing.
Where does NSTAR Electric Company provide power?: NSTAR Electric Company operates in Massachusetts. The full list of counties served is below, each linked to its live outage status.

Reliability metrics (SAIDI/SAIFI) and service territory from the US EIA Form 861. SAIDI/SAIFI are IEEE-standard, including major event days. Primary state: Massachusetts.

Data from EIA Form 861 (utility reliability) and DOE/ORNL ODIN, every source we read. Live data as of October 7, 2026 09:00 UTC.