County annual report · FIPS 13067
2025 Cobb County, GA Power Outage Report
In 2025, customers in Cobb County, GA went without power for an average of 3.0 hours, a total of 951K customer-hours (Georgia average 4.6 hours). That ranks 113th worst of 159 Georgia counties and 2070th of 3,000 nationally.
Compared with GA, the US and 2024
Coverage line is EAGLE-I's share of Georgia customers tracked each year.
Biggest outages in Cobb County, 2025
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 7, 2025 20:45 | June 9, 2025 09:15 | 1d 12h | 38,496 | 183K |
| 2 | February 16, 2025 08:30 | February 18, 2025 03:15 | 1d 18h | 22,023 | 141K |
| 3 | June 22, 2025 09:00 | July 3, 2025 08:30 | 10d 23h | 11,106 | 67K |
| 4 | June 17, 2025 08:45 | June 20, 2025 00:00 | 2d 15h | 7,479 | 32K |
| 5 | January 10, 2025 19:30 | January 12, 2025 07:30 | 1d 12h | 6,775 | 50K |
| 6 | March 16, 2025 00:15 | March 18, 2025 06:00 | 2d 5h | 6,362 | 46K |
| 7 | April 17, 2025 10:15 | April 19, 2025 00:45 | 1d 14h | 5,030 | 3,293 |
| 8 | September 6, 2025 11:00 | September 8, 2025 02:30 | 1d 15h | 5,027 | 11K |
| 9 | July 15, 2025 10:30 | July 16, 2025 06:30 | 20h | 4,413 | 5,920 |
| 10 | March 7, 2025 11:15 | March 8, 2025 02:45 | 15h 30m | 4,332 | 1,341 |
Outage episodes by size in 2025: 196 reached 100+ customers, 69 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 2025, 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 | 2024 | 25.3 hrs | 2.07 | 2.1 hrs | 1.02 |
| GreyStone Power Corporation | 2024 | 1.9 hrs | 1.50 | 1.6 hrs | 1.38 |
| Cobb Electric Membership Corp | 2024 | 60 min | 0.99 | 35 min | 0.75 |
| City of Marietta - (GA) | 2024 | 2.1 hrs | 1.69 | 2.1 hrs | 1.69 |
| 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 2025; 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, 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/georgia/cobb-county