TNSG South Plant
Natural gas power plant in North Slope, Alaska. 7.8 MW of nameplate capacity across 5 generators, operated by TDX North Slope Generating Inc..
Also known as EIA plant 58117
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 7.8 MWNameplate
- Generators
- 5 operatingEIA-860M, August 2026
- Operating since
- January 1992First generator online
- Operator
- TDX North Slope Generating Inc.EIA operator ID 57494
- Grid
- Not reported
- Price nodes
- None linkedNo verified ISO node
- Location
- North Slope, AK70.2000, −148.4667
- EIA plant ID
- 58117EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power TNSG South Plant produces
Free · EIA-923Net generation, 2025
−300 MWh
−300 MWh, final
Capacity factor, 2025
-0.4%
2024: -0.4%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
−595.0–801.0
MWh a year. Low 2017, high 2015
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | 35,559 | 48.2% | 12 of 12 |
| 2013 | 10,677 | 14.5% | 12 of 12 |
| 2014 | 9,104 | 13.3% | 12 of 12 |
| 2015 | 801 | 1.2% | 12 of 12 |
| 2016 | 0 | 0.0% | 12 of 12 |
| 2017 | −595 | -0.9% | 12 of 12 |
| 2018 | −480 | -0.7% | 12 of 12 |
| 2019 | −162 | -0.2% | 12 of 12 |
| 2020 | −533 | -0.8% | 12 of 12 |
| 2021 | −375 | -0.5% | 12 of 12 |
| 2022 | −309 | -0.5% | 12 of 12 |
| 2023 | −325 | -0.5% | 12 of 12 |
| 2024 | −300 | -0.4% | 12 of 12 |
| 2025 | −300 | -0.4% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1A | Natural Gas Internal Combustion Engine | 1.4 | September 2006 |
| 2 | Natural Gas Internal Combustion Engine | 0.8 | January 1992 |
| 3 | Natural Gas Internal Combustion Engine | 0.8 | January 1992 |
| 4A | Natural Gas Internal Combustion Engine | 1.4 | September 2006 |
| 6 | Natural Gas Internal Combustion Engine | 3.4 | October 2003 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists TDX North Slope Generating Inc. as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Power plants near TNSG South Plant
More plants operated by TDX North Slope Generating Inc.
Questions about TNSG South Plant
How much power does TNSG South Plant produce?
TNSG South Plant reported −300 MWh (−300 MWh) of net generation in 2025.
Where is TNSG South Plant?
TNSG South Plant is in North Slope, Alaska, at 70.2000, −148.4667.
Who operates TNSG South Plant?
EIA-860M for August 2026 lists TDX North Slope Generating Inc. as the operator (EIA operator ID 57494). The operator is not always the owner.
When did TNSG South Plant start operating?
Its first generator began operating in January 1992, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page