massoutage

County annual report · FIPS 47091

2025 Johnson County, TN Power Outage Report

In 2025, customers in Johnson County, TN went without power for an average of 0.0 hours, a total of 84 customer-hours (Tennessee average 4.3 hours). That ranks 77th worst of 81 Tennessee counties and 2975th of 3,000 nationally.

Summary data CSVJSON
Avg hrs / customer
0.0
9,654 customers
Customer-hours out
84
Peak customers out
4
Outages ≥1,000 out
0
0 of 10,000+ · 3 total
Longest outage
12h 15m
began December 19, 2025
Rank in state
77th/81
2975th of 3,000 US

Compared with TN, the US

Johnson County, TN average hours without power per customer compared with state and national averages, 2025Johnson County 0.0 hours, Tennessee average 4.3 hours, US average 5.9 hoursJohnson CountyJohnson County0.0hTennessee averageTennessee average4.3hUS averageUS average5.9h
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Average hours without power per customer in 2025.

Month by month

CSVJSON
Johnson County, TN customer-hours without power by month, 2025Jan 0, Feb 0, Mar 0, Apr 0, May 0, Jun 0, Jul 0, Aug 0, Sep 23, Oct 0, Nov 0, Dec 610204060800Jan0Feb0Mar0Apr0May0Jun0Jul0Aug23Sep0Oct0Nov61Dec
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Customer-hours; December was the worst month.

Johnson County year over year

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Johnson County, TN: average hours without power per customer by year2015: no data; 2016: no data; 2017: no data; 2018: no data; 2019: no data; 2020: no data; 2021: no data; 2022: no data; 2023: no data; 2024: no data; 2025: 0.0h00000n/a2015n/a2016n/a2017n/a2018n/a2019n/a2020n/a2021n/a2022n/a2023n/a20240.0h2025
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Average hours without power per customer.

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

Biggest outages in Johnson County, 2025

The 3 outage episodes with the most customers out at once. Times are UTC.

CSVJSON
#Started (UTC)Ended (UTC)DurationPeak outCustomer-hours
1September 4, 2025 17:45September 4, 2025 23:305h 45m423
2December 19, 2025 07:30December 19, 2025 19:4512h 15m449
3December 19, 2025 22:30December 20, 2025 01:303h412

Outage episodes by size in 2025: 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 Johnson County reported on EIA Form 861 for 2025, or their most recent earlier filing. Utility-wide figures, not county-specific.

CSVJSON
UtilityEIA yearSAIDISAIFISAIDI excl. major eventsSAIFI excl. major events
Mountain Electric Coop, Inc20242.8 hrs2.912.8 hrs2.91

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 Tennessee's customers in 2025; utilities it does not see are not counted.
  • Hours per customer = outage customer-minutes ÷ 9,654 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. Johnson County has data for 2025.

Cite this report

MassOutage (massoutage.com), Johnson County, TN annual power outage report, 2025, 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/2025/tennessee/johnson-county

summary CSVJSONyears CSVJSONmonths CSVJSONevents CSVJSONutilities CSVJSON
Live outages in Johnson County2025 Tennessee report2025 US report