massoutage

County annual report · FIPS 30011

2024 Carter County, MT Power Outage Report

In 2024, customers in Carter County, MT went without power for an average of 0.1 hours, a total of 39 customer-hours (Montana average 8.5 hours). That ranks 50th worst of 51 Montana counties and 2941st of 2,990 nationally.

Summary data CSVJSON
Avg hrs / customer
0.1
508 customers
Customer-hours out
39
Peak customers out
1
Outages ≥1,000 out
0
0 of 10,000+ · 2 total
Longest outage
1d 15h
began October 2, 2024
Rank in state
50th/51
2941st of 2,990 US

Compared with MT, the US and 2022

Carter County, MT average hours without power per customer compared with state and national averages, 2024Carter County 0.1 hours, Montana average 8.5 hours, US average 12.6 hours, Carter County, 2022 0.0 hoursCarter CountyCarter County0.1hMontana averageMontana average8.5hUS averageUS average12.6hCarter County, 2022Carter County, 20220.0h
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Average hours without power per customer in 2024; last bar is this county in 2022.

Month by month

CSVJSON
Carter County, MT customer-hours without power by month, 2024Jan 0, Feb 0, Mar 0, Apr 0, May 0, Jun 0, Jul 0, Aug 0, Sep 0, Oct 39, Nov 0, Dec 00102030400Jan0Feb0Mar0Apr0May0Jun0Jul0Aug0Sep39Oct0Nov0Dec
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Customer-hours; October was the worst month.

Carter County year over year

CSVJSON
Carter County, MT: average hours without power per customer by year2015: no data; 2016: 0.0h; 2017: 0.0h; 2018: 0.1h, coverage 16%; 2019: 0.0h, coverage 75%; 2020: no data; 2021: 0.0h, coverage 76%; 2022: 0.0h, coverage 76%; 2023: no data; 2024: 0.1h; 2025: 0.0h0000.10.10%50%100%n/a20150.0h20160.0h20170.1h20180.0h2019n/a20200.0h20210.0h2022n/a20230.1h20240.0h2025
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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 Carter County, 2024

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

CSVJSON
#Started (UTC)Ended (UTC)DurationPeak outCustomer-hours
1October 2, 2024 13:15October 4, 2024 04:301d 15h139
2December 5, 2024 21:30December 5, 2024 21:4515m10

Outage episodes by size in 2024: 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 Carter County reported on EIA Form 861 for 2024, or their most recent earlier filing. Utility-wide figures, not county-specific.

CSVJSON
UtilityEIA yearSAIDISAIFISAIDI excl. major eventsSAIFI excl. major events
Black Hills Power, Inc.202440 min0.7040 min0.70
Tongue River Electric Coop Inc-----
Grand Electric Coop, Inc-----
Southeast 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 n/a of Montana's customers in 2024; utilities it does not see are not counted.
  • Hours per customer = outage customer-minutes ÷ 508 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. Carter County has data for 2016–2019, 2021–2022, 2024–2025.

Cite this report

MassOutage (massoutage.com), Carter County, MT annual power outage report, 2024, 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/2024/montana/carter-county

summary CSVJSONyears CSVJSONmonths CSVJSONevents CSVJSONutilities CSVJSON
Carter County by year:2025202220212019201820172016
Live outages in Carter County2024 Montana report2024 US report