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451 MW Conventional Steam Coal (450 MW) + Petroleum Liquids (1 MW) operating in Grant, SD
451 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Conventional Steam Coal + Petroleum Liquids
1975
Operating Since
Coordinates
45.3037, -96.5101
County
Grant, SD
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Otter Tail Power Co | Montana-Dakota Utilities | — |
| Owner(s) | Montana-Dakota Utilities Co, NorthWestern Energy - (SD), Otter Tail Power Co | small shareholder(s) | — |
| Status | Operating | — | — |
Big Stone is a 451 MW hybrid power plant located in Grant County, South Dakota. The plant began operating in 1975 and is operated by Otter Tail Power Co. While the primary fuel is listed as DFO (distillate fuel oil), the plant utilizes both conventional steam coal and petroleum liquids as energy sources. Big Stone is the largest of three power plants in South Dakota and ranks 26th out of 60 nationally. The plant consists of two generators.
Big Stone operates within the Midcontinent Independent Transmission System Operator, Inc. balancing authority and the MRO NERC region. The latest annual generation data indicates an output of 2,029,575 MWh, achieving a capacity factor of 51.4%. Ownership is attributed to small shareholder(s).
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
230.0 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.
191.6K MWh
Latest Month
2.0M MWh
Annual Generation
51.4%
Capacity Factor
Forward-looking generation outlook with probabilistic ranges across weather, demand, and policy scenarios. Powered by InfraSure's generation modeling stack.
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CO₂ Intensity
2222 lb/MWh
NOx
0.842 lb/MWh
SO₂
0.771 lb/MWh
CH₄
0.231 lb/MWh
N₂O
0.034 lb/MWh
Capacity Factor
39.7%
Annual Net Gen
1567 GWh
CO₂eq
2237 lb/MWh
Subregion
MRO West
No financial data available for this plant.
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Forward revenue, DSCR bands, and refinancing risk projected under price, demand, and policy scenarios. Powered by InfraSure's asset cashflow stack.
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Point of Interconnection
Nearest Substation
Big Stone Substation · 230 kV
Substation Distance
< 10 km
Coord Source
OSM spatial
Market Position
ISO/RTO Market
MISO
LMP Node
OTP.BIGSTON1
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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