How reliable is Unitil Energy Systems?

Unitil Energy Systems customers averaged 9.9 hours without power in 2024 (SAIDI), which is frequently affected and near the US average, worse than the Massachusetts median (1.7 h), per official US EIA data.

Where does Unitil Energy Systems rank among US electric utilities?

By official EIA SAIDI, Unitil Energy Systems is #356 of 468 US utilities by reliability that report reliability and serve at least three counties, #1 being the most reliable. Overall it is near the US average.

How many customers does Unitil Energy Systems serve?

Unitil Energy Systems serves 4 counties across Massachusetts and New Hampshire, per its EIA-861 service territory filing.

Where does Unitil Energy Systems provide power?

Unitil Energy Systems operates in Massachusetts, New Hampshire. The full list of counties served is below, each linked to its live outage status.

Unitil Energy Systems: Outages & Reliability

Unitil Energy Systems appears in our live feeds only while it has outages, and none are showing as of October 7, 2026 09:00 UTC.

Unitil Energy Systems is an investor owned utility serving 4 counties in Massachusetts and New Hampshire. In 2024, its customers went an average of 9.9 hours without power (SAIDI), across about 1.7 interruptions each. That ranks it #356 of 468 US utilities by reliability, where #1 is the most reliable. Its outage duration is near the US average and worse than the Massachusetts median (1.7 h).

LIVE ON ITS NETWORKOutages only

Unitil Energy Systems only appears in our feeds while it has outages, so no outages showing here may just mean none were reported. How we see utilities →

Official reliability (EIA 2024)

US EIA

9.9 hrs

SAIDI / customer / yr

1.7

SAIFI / yr

5.7 hrs

CAIDI / outage

near the US average (US 11.0h)

Ranks #356 of 468 US utilities by reliability (#1 = most reliable) · worse than the Massachusetts median (1.7 h).

Residential price23.3¢/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 Unitil Energy Systems’s reliability has been worsening (lower is better).

Outage trend · Unitil Energy Systems

0customers out · peak 35

Data as of Oct 7, 2026 09:00 UTC

Times in EDT. Shaded stretches had no reading.

Counties served by Unitil Energy Systems (4)

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

Unitil Energy Systems: FAQ

How reliable is Unitil Energy Systems?: Unitil Energy Systems customers averaged 9.9 hours without power in 2024 (SAIDI), which is frequently affected and near the US average, worse than the Massachusetts median (1.7 h), per official US EIA data.
Where does Unitil Energy Systems rank among US electric utilities?: By official EIA SAIDI, Unitil Energy Systems is #356 of 468 US utilities by reliability that report reliability and serve at least three counties, #1 being the most reliable. Overall it is near the US average.
How many customers does Unitil Energy Systems serve?: Unitil Energy Systems serves 4 counties across Massachusetts and New Hampshire, per its EIA-861 service territory filing.
Where does Unitil Energy Systems provide power?: Unitil Energy Systems operates in Massachusetts, New Hampshire. 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.