GridPlants

Johnsonville

Natural gasTennesseeFirst unit online 1975

Johnsonville is a natural gas plant in Humphreys County, Tennessee, operated by Tennessee Valley Authority. It is the biggest of Tennessee’s 12 natural gas plants. Retired units here add up to 1,893 MW across 16 units, taken out of service between 2015 and 2025. Of its current capacity, 658 MW came online between 2023 and 2025. The operator has reported planned retirement dates for 680 MW of it, in 2028.

Nameplate capacity, 2025

1,676 MW

1,292 MW net summer capacity

24 operable units

  • Gas combustion turbine1,676 MW100%

Unit by unit, 1951 to 2025

operating in 2025retiredreported planned retirementbar height follows unit size

2 units Coal steam, 250 MW, 1951, retired by 2017
2 units Coal steam, 250 MW, 1952, retired by 2017
Unit 5 Coal steam, 147 MW, 1952–2015
Unit 6 Coal steam, 147 MW, 1953–2015
Unit 7 Coal steam, 173 MW, 1958–2015
3 units Coal steam, 518 MW, 1959, retired by 2015
10 units Gas combustion turbine, 680 MW, 1975
6 units Gas combustion turbine, 408 MW, 1975, retired by 2025
4 units Gas combustion turbine, 338 MW, 2000
10 units Gas combustion turbine, 658 MW, 2025

Among Tennessee’s plants

Largest plants in the state by nameplate capacity, with the plants ranked next to this one.

  1. 1Cumberland (TN)2,600 MW
  2. 2Watts Bar Nuclear Plant2,540 MW
  3. 3Sequoyah2,441 MW
  4. 5Raccoon Mountain1,714 MW
  5. 6Kingston1,700 MW
  6. 7Johnsonvillethis plant
  7. 8Lagoon Creek1,625 MW
  8. 9Allen1,290 MW

All power plants in Tennessee

Other rankings

All US power plants
122nd of 14,286
Power plants in Tennessee
7th of 99
US natural gas plants
40th of 1,961
Plants in the Tennessee Valley Authority balancing area
9th of 152
Plants run by Tennessee Valley Authority
9th of 53
Biggest single unit, among Tennessee’s plants
15th of 99

Operable units

14 units can switch between natural gas and oil. By the year its oldest working unit started, it is the second-oldest of Tennessee’s natural gas plants.

UnitTechnologyNameplateSummerOnlineStatus
G10Gas combustion turbine68 MW47.1 MW1975Operating, retirement planned for 2028
G11Gas combustion turbine68 MW47.1 MW1975Operating, retirement planned for 2028
G12Gas combustion turbine68 MW47.1 MW1975Operating, retirement planned for 2028
G13Gas combustion turbine68 MW47.1 MW1975Operating, retirement planned for 2028
G14Gas combustion turbine68 MW47.1 MW1975Operating, retirement planned for 2028
G15Gas combustion turbine68 MW47.1 MW1975Operating, retirement planned for 2028
G16Gas combustion turbine68 MW47.1 MW1975Operating, retirement planned for 2028
GT1Gas combustion turbine68 MW47.1 MW1975Operating, retirement planned for 2028
GT2Gas combustion turbine68 MW47.1 MW1975Operating, retirement planned for 2028
GT3Gas combustion turbine68 MW47.1 MW1975Operating, retirement planned for 2028
G17Gas combustion turbine84.5 MW72.8 MW2000Operating
G18Gas combustion turbine84.5 MW72.8 MW2000Operating
G19Gas combustion turbine84.5 MW72.8 MW2000Operating
G20Gas combustion turbine84.5 MW72.8 MW2000Operating
G21Gas combustion turbine65.8 MW53 MW2025Operating
G22Gas combustion turbine65.8 MW53 MW2025Operating
G23Gas combustion turbine65.8 MW53 MW2025Operating
G24Gas combustion turbine65.8 MW53 MW2025Operating
G25Gas combustion turbine65.8 MW53 MW2025Operating
G27Gas combustion turbine65.8 MW53 MW2025Operating
G28Gas combustion turbine65.8 MW53 MW2025Operating
G29Gas combustion turbine65.8 MW53 MW2025Operating
G30Gas combustion turbine65.8 MW53 MW2025Operating
G26Gas combustion turbine65.8 MW53 MW2025Operating

Retired units

UnitTechnologyNameplateIn service
10Coal steam173 MW1959–2015
5Coal steam147 MW1952–2015
6Coal steam147 MW1953–2015
7Coal steam173 MW1958–2015
8Coal steam173 MW1959–2015
9Coal steam173 MW1959–2015
1Coal steam125 MW1951–2017
2Coal steam125 MW1951–2017
3Coal steam125 MW1952–2017
4Coal steam125 MW1952–2017
GT4Gas combustion turbine68 MW1975–2025
GT5Gas combustion turbine68 MW1975–2025
GT6Gas combustion turbine68 MW1975–2025
GT7Gas combustion turbine68 MW1975–2025
GT8Gas combustion turbine68 MW1975–2025
GT9Gas combustion turbine68 MW1975–2025

Grid and site

Reliability region
SERC Reliability Corporation
Highest grid connection voltage
161 kV
Water source
Tennessee River
Nearest town on record
New Johnsonville
Operator type
Utility
Coordinates
36.028°N, 87.986°W

Closest plants

PlantRuns onCapacityDistance
West CamdenBiomass and waste4.8 MW9.0 mi west
SR LexingtonSolar6.5 MW30.2 mi southwest
Cumberland (TN)Coal2,600 MW31.1 mi northeast
SR ParisSolar6.8 MW34.6 mi northwest
SR TrezevantSolar6.5 MW35.4 mi west
Gleason Generating FacilityNatural gas568 MW38.0 mi northwest
Bi-County Gas ProducersBiomass and waste3 MW43.1 mi northeast
CheathamHydroelectric36 MW47.2 mi northeast

See every natural gas plant in Tennessee in the plant finder Natural gas plants nationwide