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Johnsonville

Natural gas power plant · Humphreys County, Tennessee

Nameplate capacity
1,676 MW
Rank in Tennessee
#7
of 106 plants
In service since
1975
June 1975

Details

Primary fuel
Natural gas
Technology
Natural Gas Fired Combustion Turbine
Operator
Tennessee Valley Authority
County
Humphreys County
Generating units
24
Share of state capacity
7.06%
Rank among natural gas plants in Tennessee
#1 of 12
EIA plant code
3406

Generating units

Individual generating units at Johnsonville
UnitTechnologyNameplateSummerOnlineStatus
G17Natural Gas Fired Combustion Turbine85 MW73 MW2000Operating
G18Natural Gas Fired Combustion Turbine85 MW73 MW2000Operating
G19Natural Gas Fired Combustion Turbine85 MW73 MW2000Operating
G20Natural Gas Fired Combustion Turbine85 MW73 MW2000Operating
G10Natural Gas Fired Combustion Turbine68 MW47 MW1975Operating
G11Natural Gas Fired Combustion Turbine68 MW47 MW1975Operating
G12Natural Gas Fired Combustion Turbine68 MW47 MW1975Operating
G13Natural Gas Fired Combustion Turbine68 MW47 MW1975Operating
G14Natural Gas Fired Combustion Turbine68 MW47 MW1975Operating
G15Natural Gas Fired Combustion Turbine68 MW47 MW1975Operating
G16Natural Gas Fired Combustion Turbine68 MW47 MW1975Operating
GT1Natural Gas Fired Combustion Turbine68 MW47 MW1975Operating
GT2Natural Gas Fired Combustion Turbine68 MW47 MW1975Operating
GT3Natural Gas Fired Combustion Turbine68 MW47 MW1975Operating
G21Natural Gas Fired Combustion Turbine66 MW53 MW2025Operating
G22Natural Gas Fired Combustion Turbine66 MW53 MW2025Operating
G23Natural Gas Fired Combustion Turbine66 MW53 MW2025Operating
G24Natural Gas Fired Combustion Turbine66 MW53 MW2025Operating
G25Natural Gas Fired Combustion Turbine66 MW53 MW2025Operating
G26Natural Gas Fired Combustion Turbine66 MW53 MW2025Operating
G27Natural Gas Fired Combustion Turbine66 MW53 MW2025Operating
G28Natural Gas Fired Combustion Turbine66 MW53 MW2025Operating
G29Natural Gas Fired Combustion Turbine66 MW53 MW2025Operating
G30Natural Gas Fired Combustion Turbine66 MW53 MW2025Operating

Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.

Similarly sized plants in Tennessee

Raccoon MountainHydro1,714 MW
KingstonCoal1,700 MW
Lagoon CreekNatural gas1,625 MW
AllenNatural gas1,290 MW

About this data

From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 1,676 MW solar plant and a 1,676 MW nuclear plant have the same entry here and produce very different amounts of electricity.

“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Tennessee power plants · What Tennessee actually generates