County annual report · FIPS 13067
2018 Cobb County, GA Power Outage Report
In 2018, customers in Cobb County, GA went without power for an average of 1.2 hours, a total of 399K customer-hours (Georgia average 4.7 hours). That ranks 138th worst of 157 Georgia counties and 2214th of 2,798 nationally.
Compared with GA, the US and 2017
Coverage line is EAGLE-I's share of Georgia customers tracked each year.
Biggest outages in Cobb County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 8, 2018 22:45 | December 10, 2018 03:15 | 1d 4h | 8,651 | 31K |
| 2 | July 21, 2018 10:15 | July 23, 2018 06:00 | 1d 19h | 5,571 | 15K |
| 3 | November 18, 2018 10:45 | November 18, 2018 19:30 | 8h 45m | 5,489 | 2,473 |
| 4 | July 6, 2018 10:30 | July 7, 2018 08:45 | 22h 15m | 5,319 | 7,359 |
| 5 | October 1, 2018 23:45 | October 2, 2018 02:30 | 2h 45m | 5,299 | 2,681 |
| 6 | June 11, 2018 10:30 | June 13, 2018 04:00 | 1d 17h | 5,013 | 3,673 |
| 7 | December 12, 2018 11:45 | December 12, 2018 22:15 | 10h 30m | 4,883 | 2,070 |
| 8 | June 1, 2018 05:45 | June 2, 2018 13:00 | 1d 7h | 4,769 | 21K |
| 9 | June 27, 2018 08:45 | June 30, 2018 07:00 | 2d 22h | 3,957 | 8,516 |
| 10 | October 10, 2018 02:15 | October 12, 2018 03:30 | 2d 1h | 3,934 | 27K |
Outage episodes by size in 2018: 186 reached 100+ customers, 64 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 Cobb County reported on EIA Form 861 for 2018, 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 | 2018 | 3.8 hrs | 1.48 | 2.1 hrs | 1.21 |
| GreyStone Power Corporation | 2018 | 2.7 hrs | 1.50 | 1.7 hrs | 1.31 |
| Cobb Electric Membership Corp | 2018 | 31 min | 0.50 | 31 min | 0.50 |
| City of Marietta - (GA) | 2018 | 1.7 hrs | 1.54 | 1.7 hrs | 1.54 |
| 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 90% of Georgia's customers in 2018; 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, 2018, 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/2018/georgia/cobb-county