massoutage

County annual report · FIPS 30033

2021 Garfield County, MT Power Outage Report

In 2021, customers in Garfield County, MT went without power for an average of 0.0 hours, a total of 48 customer-hours (Montana average 5.0 hours). That ranks 50th worst of 51 Montana counties and 2945th of 2,974 nationally.

Summary data CSVJSON
Avg hrs / customer
0.0
1,613 customers
Customer-hours out
48
Peak customers out
1
Outages ≥1,000 out
0
0 of 10,000+ · 1 total
Longest outage
2d
began May 11, 2021
Rank in state
50th/51
2945th of 2,974 US

Compared with MT, the US and 2020

Garfield County, MT average hours without power per customer compared with state and national averages, 2021Garfield County 0.0 hours, Montana average 5.0 hours, US average 8.9 hours, Garfield County, 2020 0.0 hoursGarfield CountyGarfield County0.0hMontana averageMontana average5.0hUS averageUS average8.9hGarfield County, 2020Garfield County, 20200.0h
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Average hours without power per customer in 2021; last bar is this county in 2020.

Month by month

CSVJSON
Garfield County, MT customer-hours without power by month, 2021Jan 0, Feb 0, Mar 0, Apr 0, May 48, Jun 0, Jul 0, Aug 0, Sep 0, Oct 0, Nov 0, Dec 002040600Jan0Feb0Mar0Apr48May0Jun0Jul0Aug0Sep0Oct0Nov0Dec
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Customer-hours; May was the worst month.

Garfield County year over year

CSVJSON
Garfield County, MT: average hours without power per customer by year2015: no data; 2016: no data; 2017: no data; 2018: no data; 2019: no data; 2020: 0.0h, coverage 76%; 2021: 0.0h, coverage 76%; 2022: no data; 2023: 0.0h; 2024: 0.1h; 2025: 0.0h0000.10%50%100%n/a2015n/a2016n/a2017n/a2018n/a20190.0h20200.0h2021n/a20220.0h20230.1h20240.0h2025
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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 Garfield County, 2021

The 1 outage episodes with the most customers out at once. Times are UTC.

CSVJSON
#Started (UTC)Ended (UTC)DurationPeak outCustomer-hours
1May 11, 2021 20:00May 13, 2021 20:002d148

Outage episodes by size in 2021: 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 Garfield County reported on EIA Form 861 for 2021, or their most recent earlier filing. Utility-wide figures, not county-specific.

CSVJSON
UtilityEIA yearSAIDISAIFISAIDI excl. major eventsSAIFI excl. major events
WAPA-- Western Area Power Administration-----
McCone 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 76% of Montana's customers in 2021; utilities it does not see are not counted.
  • Hours per customer = outage customer-minutes ÷ 1,613 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. Garfield County has data for 2020–2021, 2023–2025.

Cite this report

MassOutage (massoutage.com), Garfield County, MT annual power outage report, 2021, 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/). https://massoutage.com/reports/2021/montana/garfield-county

summary CSVJSONyears CSVJSONmonths CSVJSONevents CSVJSONutilities CSVJSON
Garfield County by year:2025202420232020
Live outages in Garfield County2021 Montana report2021 US report