County annual report · FIPS 13067
2020 Cobb County, GA Power Outage Report
In 2020, customers in Cobb County, GA went without power for an average of 5.0 hours, a total of 1.6M customer-hours (Georgia average 7.4 hours). That ranks 76th worst of 159 Georgia counties and 1403rd of 3,019 nationally.
Compared with GA, the US and 2019
Coverage line is EAGLE-I's share of Georgia customers tracked each year.
Biggest outages in Cobb County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 29, 2020 06:45 | November 3, 2020 03:45 | 4d 21h | 65,007 | 1.3M |
| 2 | January 11, 2020 20:00 | January 13, 2020 04:45 | 1d 8h | 6,726 | 27K |
| 3 | June 27, 2020 14:00 | June 28, 2020 09:30 | 19h 30m | 6,698 | 20K |
| 4 | December 11, 2020 05:45 | December 12, 2020 00:00 | 18h 15m | 6,338 | 4,543 |
| 5 | August 3, 2020 12:30 | August 4, 2020 22:00 | 1d 9h | 3,759 | 6,638 |
| 6 | June 10, 2020 11:00 | June 12, 2020 11:15 | 2d | 3,321 | 21K |
| 7 | July 18, 2020 11:30 | July 20, 2020 04:00 | 1d 16h | 3,104 | 6,977 |
| 8 | December 14, 2020 10:00 | December 15, 2020 01:00 | 15h | 2,684 | 3,006 |
| 9 | March 4, 2020 02:45 | March 4, 2020 16:45 | 14h | 2,516 | 4,446 |
| 10 | October 10, 2020 10:15 | October 12, 2020 23:45 | 2d 13h | 2,430 | 3,377 |
Outage episodes by size in 2020: 147 reached 100+ customers, 42 reached 1,000+ customers, 1 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 Cobb County reported on EIA Form 861 for 2020, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Georgia Power Co | 2020 | 8.8 hrs | 1.92 | 2.4 hrs | 1.33 |
| GreyStone Power Corporation | 2020 | 13.4 hrs | 2.40 | 1.6 hrs | 1.36 |
| Cobb Electric Membership Corp | 2020 | 6.3 hrs | 0.82 | 34 min | 0.49 |
| City of Marietta - (GA) | 2020 | 8.1 hrs | 2.49 | 1.8 hrs | 1.94 |
| City of Acworth - (GA) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 88% of Georgia's customers in 2020; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 322,249 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. Cobb County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Cobb County, GA annual power outage report, 2020, 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/2020/georgia/cobb-county