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72.6 MW Hydro operating in Carlton, MN
72.6 MW
Nameplate Capacity
6
Generators
units
Conventional Hydroelectric
Technology
1907
Operating Since
Coordinates
46.6562, -92.3323
County
Carlton, MN
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | ALLETE, Inc. | ALLETE | — |
| Owner(s) | ALLETE, Inc. | ALLETE | — |
| Status | Operating | operating | — |
The Thomson hydroelectric plant is located in Carlton County, Minnesota. It is owned and operated by ALLETE, Inc. The plant has a total capacity of 72.6 MW consisting of 6 generators, and it began operating in 1907. Thomson is the second-largest hydroelectric plant in Minnesota (2 of 24) and ranks 244th nationally among 1464 hydroelectric facilities. The plant's primary fuel source is water (WAT), utilizing conventional hydroelectric technology.
In the most recent year of record, Thomson generated 290,470 MWh of electricity, achieving a capacity factor of 45.6%. The plant operates within the Midcontinent Independent Transmission System Operator, Inc. (MISO) balancing authority and the MRO NERC region. Financial data indicates an installed cost of $1561.09 per kW. The power purchase agreement (PPA) price is $40 per MWh.
Generated from EIA, GEM, and public data sources
ISO/RTO
MISO
Market
ISO/RTO Member
NERC Region
MRO — Midwest Reliability Organization
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc.. (MISO)
Grid Voltage
115.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
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.
10.6K MWh
Latest Month
290.5K MWh
Annual Generation
45.6%
Capacity Factor
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ALLETE, Inc. · Data from 2015–2025
$40.0/MWh
PPA Price
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
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Point of Interconnection
Nearest Substation
Wrenshall Substation · 115 kV
Substation Distance
< 10 km
Coord Source
OSM spatial
Market Position
ISO/RTO Market
MISO
LMP Node
MP.THOMSON
Pricing Hub
MINN.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
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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