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103.9 MW Hydro operating in Marion, TN
103.9 MW
Nameplate Capacity
4
Generators
units
Conventional Hydroelectric
Technology
1968
Operating Since
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Tennessee Valley Authority | Tennessee Valley Authority | — |
| Owner(s) | Tennessee Valley Authority | Tennessee Valley Authority | — |
| Status | Operating | operating | — |
Nickajack Dam is a hydroelectric dam in Marion County in the U.S. state of Tennessee. It is one of nine dams on the Tennessee River owned and operated by the Tennessee Valley Authority, which built the dam in the mid-1960s to replace the outdated Hales Bar Dam 6 miles (9.7 km) upstream. The dam impounds the 10,370-acre (4,200 ha) Nickajack Lake and feeds into Guntersville Lake. Nickajack Dam is named for a Cherokee village once located just upstream from the dam. The village was the namesake for Nickajack Cave, which was partially flooded by the reservoir.
Read more on WikipediaThe Nickajack Hydroelectric Plant, located in Marion County, Tennessee, has a total capacity of 103.9 MW. The plant began operating in 1968 and utilizes conventional hydroelectric technology with water (WAT) as its primary fuel source. It consists of four generators and is owned and operated by the Tennessee Valley Authority (TVA). The plant operates within the Tennessee Valley Authority balancing authority area and the SERC NERC region.
In the most recent year with available data, Nickajack generated 491,171 MWh of electricity, achieving a capacity factor of 53.7%. According to available rankings, the plant is the 12th largest of 13 hydroelectric plants in Tennessee and ranks 180th out of 194 hydroelectric plants nationally.
Generated from EIA, GEM, and public data sources
Grid Region
Southeast
Market
SEEM Participant
NERC Region
SERC — SERC Reliability Corporation
Balancing Authority
Tennessee Valley Authority (TVA)
Grid Voltage
161.0 kV
Regulatory Status
RE — Regulated
Entity Type
Federal
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
54.9K MWh
Latest Month
491.2K MWh
Annual Generation
53.7%
Capacity Factor
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2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $238.4M
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This plant's balancing authority participates in the Southeast Energy Exchange Market (SEEM). SEEM is a bilateral exchange — no public nodal pricing.
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-05-31
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