Electricity in Cobb County, Georgia
4 electric utilities serve homes in Cobb County, Georgia: Georgia Power, Cobb Electric Membership Corporation, GreyStone Power and City of Marietta. In 2025, the average home bill of these utilities was $98.99 (City of Marietta) to $161.13 (Georgia Power) a month. This page covers 4 cities with 25,000 or more people in the county, from Mableton to Kennesaw.
- 4 cities
- 4 utilities
- EIA and Census data, 2025
Electric utilities in Cobb County
EIA lists utilities by county, not by address. Your address has one utility: its name is on your bill, or type your ZIP code in the utility finder.
| Utility | Homes in Georgia | Average bill 2025 | 1,000 kWh now |
|---|---|---|---|
| Georgia PowerInvestor-owned utility · bill calculator | 2,480,484 | $161.13990 kWh, 16.3¢ | $149.91 |
| Cobb Electric Membership CorporationElectric cooperative | 203,131 | $128.801,116 kWh, 11.6¢ | — |
| GreyStone PowerElectric cooperative | 142,841 | $149.261,189 kWh, 12.6¢ | — |
| City of MariettaCity utility | 36,288 | $98.99830 kWh, 11.9¢ | — |
1 smaller utility with fewer than 1,000 homes is also listed in the county. The average bill is the 2025 average of each utility's homes that bought their power from it (EIA-861). The Georgia average was $158.70 a month.
Cities in Cobb County
| City | People | City-owned utility | Solar kWh a year per kW |
|---|---|---|---|
| Mableton | 78,820 | — | 1,421 |
| Marietta | 63,574 | City of Marietta | 1,407 |
| Smyrna | 57,513 | — | 1,406 |
| Kennesaw | 37,970 | — | 1,400 |
A city-owned utility is a municipal utility in the county with the city's name (EIA data). Solar output: PVWatts version 8 for a south-facing roof; see the solar savings calculator.
More about Georgia: Georgia electric rates, all Georgia utilities, home energy rebates and natural gas bills.
Who provides electricity in Cobb County?
4 electric utilities serve homes in Cobb County, Georgia: Georgia Power, Cobb Electric Membership Corporation, GreyStone Power and City of Marietta. The name of your utility is on your bill.
Which cities in Cobb County are on this page?
Mableton, Marietta, Smyrna and Kennesaw.
Sources: EIA-861 data, 2025 (utilities by county, homes and average bills); Census Bureau city population estimates, Vintage 2025; PVWatts (National Laboratory of the Rockies).