massoutage

County annual report · FIPS 30093

2019 Silver Bow County, MT Power Outage Report

In 2019, customers in Silver Bow County, MT went without power for an average of 0.0 hours, a total of 10 customer-hours (Montana average 0.6 hours). That ranks 36th worst of 38 Montana counties and 2935th of 2,945 nationally.

Summary data CSVJSON
Avg hrs / customer
0.0
24,074 customers
Customer-hours out
10
Peak customers out
6
Outages ≥1,000 out
0
0 of 10,000+ · 2 total
Longest outage
5h
began December 27, 2019
Rank in state
36th/38
2935th of 2,945 US

Compared with MT, the US

Silver Bow County, MT average hours without power per customer compared with state and national averages, 2019Silver Bow County 0.0 hours, Montana average 0.6 hours, US average 4.7 hoursSilver Bow CountySilver Bow County0.0hMontana averageMontana average0.6hUS averageUS average4.7h
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Average hours without power per customer in 2019.

Month by month

CSVJSON
Silver Bow County, MT customer-hours without power by month, 2019Jan 0, Feb 0, Mar 0, Apr 0, May 0, Jun 0, Jul 0, Aug 0, Sep 0, Oct 0, Nov 0, Dec 1002.557.5100Jan0Feb0Mar0Apr0May0Jun0Jul0Aug0Sep0Oct0Nov10Dec
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Customer-hours; December was the worst month.

Silver Bow County year over year

CSVJSON
Silver Bow County, MT: average hours without power per customer by year2015: no data; 2016: no data; 2017: no data; 2018: no data; 2019: 0.0h, coverage 75%; 2020: 4.9h, coverage 76%; 2021: 1.4h, coverage 76%; 2022: 2.2h, coverage 76%; 2023: 0.9h; 2024: 1.5h; 2025: 2.6h02460%50%100%n/a2015n/a2016n/a2017n/a20180.0h20194.9h20201.4h20212.2h20220.9h20231.5h20242.6h2025
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Average hours without power per customer. Line: EAGLE-I coverage, share of customers tracked (right axis).

Coverage line is EAGLE-I's share of Montana customers tracked each year.

Biggest outages in Silver Bow County, 2019

The 2 outage episodes with the most customers out at once. Times are UTC.

CSVJSON
#Started (UTC)Ended (UTC)DurationPeak outCustomer-hours
1December 25, 2019 15:00December 25, 2019 16:001h65
2December 27, 2019 18:30December 27, 2019 23:305h15

Outage episodes by size in 2019: 0 reached 100+ customers, 0 reached 1,000+ customers, 0 reached 10,000+ customers.

Utility reliability filed with the EIA

SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Silver Bow County reported on EIA Form 861 for 2019, or their most recent earlier filing. Utility-wide figures, not county-specific.

CSVJSON
UtilityEIA yearSAIDISAIFISAIDI excl. major eventsSAIFI excl. major events
NorthWestern Energy LLC - (MT)20181.7 hrs1.081.7 hrs1.08
Bonneville Power Administration-----
NorthWestern Energy-----
Vigilante Electric Coop, Inc-----

About this data

  • Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 75% of Montana's customers in 2019; utilities it does not see are not counted.
  • Hours per customer = outage customer-minutes ÷ 24,074 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
  • An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
  • Years loaded: 2015–2025. Silver Bow County has data for 2019–2025.

Cite this report

MassOutage (massoutage.com), Silver Bow County, MT annual power outage report, 2019, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2019/montana/silver-bow-county

summary CSVJSONyears CSVJSONmonths CSVJSONevents CSVJSONutilities CSVJSON
Silver Bow County by year:202520242023202220212020
Live outages in Silver Bow County2019 Montana report2019 US report