County annual report · FIPS 13067
2015 Cobb County, GA Power Outage Report
In 2015, customers in Cobb County, GA went without power for an average of 0.8 hours, a total of 242K customer-hours (Georgia average 1.8 hours). That ranks 94th worst of 157 Georgia counties and 1909th of 2,484 nationally.
Compared with GA, the US
Coverage line is EAGLE-I's share of Georgia customers tracked each year.
Biggest outages in Cobb County, 2015
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 28, 2015 22:30 | June 29, 2015 09:00 | 10h 30m | 19,730 | 5,777 |
| 2 | April 18, 2015 13:30 | April 18, 2015 22:00 | 8h 30m | 6,092 | 6,559 |
| 3 | April 19, 2015 09:15 | April 19, 2015 23:45 | 14h 30m | 6,077 | 1,648 |
| 4 | May 18, 2015 13:30 | May 19, 2015 08:45 | 19h 15m | 5,079 | 8,338 |
| 5 | July 21, 2015 12:30 | July 22, 2015 09:30 | 21h | 4,686 | 5,820 |
| 6 | November 14, 2015 12:15 | November 14, 2015 19:45 | 7h 30m | 4,641 | 12K |
| 7 | December 24, 2015 09:00 | December 25, 2015 05:00 | 20h | 4,421 | 11K |
| 8 | September 4, 2015 10:45 | September 5, 2015 06:30 | 19h 45m | 4,319 | 7,796 |
| 9 | August 8, 2015 15:30 | August 8, 2015 16:30 | 1h | 4,054 | 2,508 |
| 10 | October 15, 2015 12:00 | October 16, 2015 02:30 | 14h 30m | 3,728 | 1,391 |
Outage episodes by size in 2015: 163 reached 100+ customers, 63 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 2015, 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 | 2015 | 2.9 hrs | 1.50 | 1.9 hrs | 1.30 |
| GreyStone Power Corporation | 2015 | 2.1 hrs | 1.60 | 1.6 hrs | 1.41 |
| Cobb Electric Membership Corp | 2015 | 30 min | 0.54 | 30 min | 0.54 |
| City of Marietta - (GA) | 2015 | 74 min | 0.95 | 60 min | 0.84 |
| 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 2015; 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, 2015, 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/2015/georgia/cobb-county