massoutage

NorthWestern Energy LLC - (MT): Outages & Reliability

As of October 7, 2026 09:00 UTC, about 35 NorthWestern Energy LLC - (MT) customers are without power in 4 counties.

NorthWestern Energy LLC - (MT) is an investor owned utility serving 38 counties in Montana and Wyoming. In 2024, its customers went an average of 3.9 hours without power (SAIDI), across about 1.3 interruptions each. That ranks it #200 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 Montana median (5.7 h).

SCATTERED OUTAGES · ON ITS NETWORKLive · total only
35
NorthWestern Energy LLC - (MT) customers out in 4 counties

Official reliability (EIA 2024)

US EIA
3.9 hrs
SAIDI / customer / yr
1.3
SAIFI / yr
3.0 hrs
CAIDI / outage
better than the US average (US 11.0h)

Ranks #200 of 468 US utilities by reliability (#1 = most reliable) · better than the Montana median (5.7 h).

Residential price14.2¢/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 NorthWestern Energy LLC - (MT)’s reliability has been worsening (lower is better).

NorthWestern Energy LLC - (MT) SAIDI by year2013–2024: 2013 2.4h, 2014 1.9h, 2015 4.3h, 2016 2.4h, 2017 2.6h, 2018 1.7h, 2020 2.8h, 2021 2.5h, 2022 2.2h, 2023 1.7h, 2024 3.9h. Highlighted: 2015 (highest).02462.4h20131.9h20144.3h20152.4h20162.6h20171.7h20182.8h20202.5h20212.2h20221.7h20233.9h2024
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Outage trend · NorthWestern Energy LLC - (MT)
35customers out · peak 483
Data as of Oct 7, 2026 09:00 UTC
NorthWestern Energy LLC - (MT): customers without power, last 24 hoursPeak 483 customers out; latest 35 as of Oct 7, 2026 09:00 UTC. Each point is the highest reading in its interval.02004006006 AM12 PM6 PMOct 7
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Times in EDT. Shaded stretches had no reading.

Counties served by NorthWestern Energy LLC - (MT) (38)

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

What causes NorthWestern Energy LLC - (MT) outages

Share of outage-time by reported cause across the counties it serves (territory-wide, may include other utilities in shared counties).

Outage causes by share of outage-timePlanned / maintenance 100%Planned / maintenancePlanned / maintenance100%
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A reported cause is available for 1% of outage-time over 2 months of live data. Shares are of the portion with a known cause; bars are scaled to the largest cause.

NorthWestern Energy LLC - (MT): FAQ

How reliable is NorthWestern Energy LLC - (MT)?
NorthWestern Energy LLC - (MT) customers averaged 3.9 hours without power in 2024 (SAIDI), which is below average and better than the US average, better than the Montana median (5.7 h), per official US EIA data.
Where does NorthWestern Energy LLC - (MT) rank among US electric utilities?
By official EIA SAIDI, NorthWestern Energy LLC - (MT) is #200 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 NorthWestern Energy LLC - (MT) serve?
NorthWestern Energy LLC - (MT) serves 38 counties across Montana and Wyoming, per its EIA-861 service territory filing.
Where does NorthWestern Energy LLC - (MT) provide power?
NorthWestern Energy LLC - (MT) operates in Montana, Wyoming. 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: Montana.

Data from EIA Form 861 (utility reliability) and DOE/ORNL ODIN, every source we read. Live data as of .