County annual report · FIPS 13067
2017 Cobb County, GA Power Outage Report
In 2017, customers in Cobb County, GA went without power for an average of 7.9 hours, a total of 2.5M customer-hours (Georgia average 14.2 hours). That ranks 104th worst of 158 Georgia counties and 677th of 2,786 nationally.
Compared with GA, the US and 2016
Coverage line is EAGLE-I's share of Georgia customers tracked each year.
Biggest outages in Cobb County, 2017
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, 2017 10:00 | December 15, 2017 02:30 | 6d 16h | 67,177 | 2.0M |
| 2 | March 21, 2017 22:30 | March 23, 2017 07:15 | 1d 8h | 11,044 | 53K |
| 3 | January 22, 2017 21:00 | January 24, 2017 05:15 | 1d 8h | 6,631 | 12K |
| 4 | June 15, 2017 00:00 | June 17, 2017 04:30 | 2d 4h | 6,370 | 26K |
| 5 | September 11, 2017 09:15 | September 16, 2017 12:30 | 5d 3h | 6,242 | 106K |
| 6 | April 3, 2017 12:45 | April 4, 2017 11:15 | 22h 30m | 4,513 | 14K |
| 7 | May 2, 2017 22:45 | May 3, 2017 21:00 | 22h 15m | 3,573 | 6,091 |
| 8 | April 7, 2017 18:30 | April 8, 2017 14:30 | 20h | 3,470 | 9,277 |
| 9 | August 7, 2017 00:00 | August 8, 2017 00:30 | 1d | 3,225 | 8,132 |
| 10 | January 7, 2017 02:45 | January 8, 2017 03:00 | 1d | 3,223 | 15K |
Outage episodes by size in 2017: 194 reached 100+ customers, 59 reached 1,000+ customers, 2 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 2017, 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 | 2017 | 18.4 hrs | 2.19 | 1.9 hrs | 1.16 |
| GreyStone Power Corporation | 2017 | 20.5 hrs | 2.71 | 1.5 hrs | 1.18 |
| Cobb Electric Membership Corp | 2017 | 3.8 hrs | 1.03 | 39 min | 0.52 |
| City of Marietta - (GA) | 2017 | 7.4 hrs | 2.74 | 1.9 hrs | 1.40 |
| 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 2017; 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, 2017, 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/2017/georgia/cobb-county