How reliable is NorthWestern Energy?

NorthWestern Energy did not report standardized SAIDI/SAIFI reliability metrics to the EIA. Outage history for the counties it serves is available on their individual pages.

How many customers does NorthWestern Energy serve?

NorthWestern Energy serves 23 counties across 3 states, per its EIA-861 service territory filing.

Where does NorthWestern Energy provide power?

NorthWestern Energy operates in Montana, South Dakota, Wyoming. The full list of counties served is below, each linked to its live outage status.

NorthWestern Energy: Outages & Reliability

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

NorthWestern Energy is an electric utility serving 23 counties in 3 states. NorthWestern Energy did not report standardized reliability metrics to the EIA (common for smaller or short-form utilities), but its service territory and outage history are tracked below.

LIVE ON ITS NETWORKOutages only

NorthWestern Energy 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

US EIA

Not reported to EIA

Outage trend · NorthWestern Energy

0customers out

Data as of Oct 7, 2026 09:00 UTC

Times in EDT. Shaded stretches had no reading.

Counties served by NorthWestern Energy (23)

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

What causes NorthWestern Energy outages

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

A reported cause is available for 1.4% 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: FAQ

How reliable is NorthWestern Energy?: NorthWestern Energy did not report standardized SAIDI/SAIFI reliability metrics to the EIA. Outage history for the counties it serves is available on their individual pages.
How many customers does NorthWestern Energy serve?: NorthWestern Energy serves 23 counties across 3 states, per its EIA-861 service territory filing.
Where does NorthWestern Energy provide power?: NorthWestern Energy operates in Montana, South Dakota, 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 October 7, 2026 09:00 UTC.