TNSG South Plant
Natural gas power plant · North Slope County, Alaska
Nameplate capacity
7.8 MW
Rank in Alaska
#63
of 150 plants
In service since
1992
January 1992
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Internal Combustion Engine
- Operator
- TDX North Slope Generating Inc.
- County
- North Slope County
- Generating units
- 5
- Share of state capacity
- 0.25%
- Rank among natural gas plants in Alaska
- #13 of 13
- EIA plant code
- 58117
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 6 | Natural Gas Internal Combustion Engine | 3.4 MW | 3.0 MW | 2003 | Operating |
| 1A | Natural Gas Internal Combustion Engine | 1.4 MW | 1.3 MW | 2006 | Operating |
| 4A | Natural Gas Internal Combustion Engine | 1.4 MW | 1.3 MW | 2006 | Operating |
| 2 | Natural Gas Internal Combustion Engine | 0.8 MW | 0.8 MW | 1992 | Operating |
| 3 | Natural Gas Internal Combustion Engine | 0.8 MW | 0.8 MW | 1992 | Operating |
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 Alaska
| Haines | Other | 8.3 MW |
| Tok | Other | 8.2 MW |
| Fort Greely Power Plant | Other | 7.4 MW |
| Westward Seafoods | Other | 6.6 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 7.8 MW solar plant and a 7.8 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 Alaska power plants · What Alaska actually generates