County annual report · FIPS 13067
2023 Cobb County, GA Power Outage Report
In 2023, customers in Cobb County, GA went without power for an average of 2.3 hours, a total of 756K customer-hours (Georgia average 6.6 hours). That ranks 136th worst of 159 Georgia counties and 2170th of 2,977 nationally.
Compared with GA, the US and 2022
Coverage line is EAGLE-I's share of Georgia customers tracked each year.
Biggest outages in Cobb County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 25, 2023 18:00 | June 28, 2023 22:45 | 3d 4h | 22,843 | 105K |
| 2 | February 11, 2023 21:45 | February 12, 2023 19:30 | 21h 45m | 12,528 | 13K |
| 3 | August 10, 2023 10:30 | August 11, 2023 07:15 | 20h 45m | 10,629 | 12K |
| 4 | August 6, 2023 13:15 | August 10, 2023 03:00 | 3d 13h | 9,937 | 42K |
| 5 | April 1, 2023 09:15 | April 2, 2023 12:15 | 1d 3h | 7,122 | 6,249 |
| 6 | July 20, 2023 05:15 | July 23, 2023 02:00 | 2d 20h | 6,363 | 35K |
| 7 | November 15, 2023 11:15 | November 17, 2023 01:15 | 1d 14h | 6,295 | 3,802 |
| 8 | August 20, 2023 15:45 | August 21, 2023 01:45 | 10h | 5,679 | 2,909 |
| 9 | March 3, 2023 06:15 | March 4, 2023 07:15 | 1d 1h | 5,588 | 14K |
| 10 | September 16, 2023 14:15 | September 17, 2023 14:00 | 23h 45m | 5,483 | 7,273 |
Outage episodes by size in 2023: 198 reached 100+ customers, 70 reached 1,000+ customers, 3 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 2023, 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 | 2023 | 6.1 hrs | 1.75 | 2.3 hrs | 1.24 |
| GreyStone Power Corporation | 2023 | 3.3 hrs | 1.96 | 1.8 hrs | 1.92 |
| Cobb Electric Membership Corp | 2023 | 37 min | 0.89 | 33 min | 0.85 |
| City of Marietta - (GA) | 2023 | 3.4 hrs | 2.93 | 2.2 hrs | 2.48 |
| 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 n/a of Georgia's customers in 2023; 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, 2023, 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/2023/georgia/cobb-county