Big Stone

Power plant · Coal

Key facts

Power plant · Coal Operating

Net generation MWh by year, 2001 to 2026

Fuel burned MMBtu by year, 2001 to 2026

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Technology: Coal source: “Conventional Steam Coal”
Age: 51 years since 1975
Unused energy: 1,921 GWh 2025Unused energyA lead, not a guarantee: MW × hours × (1 − capacity factor) for the latest year (EIA-923), gas, coal and oil plants only. Air-permit run-hour caps, heat rate (cost to run) and capacity-market or reliability obligations can rule it out.
Heat rate: 11,093 Btu/kWh 2025

All 9 attributes from EIA-860M Preliminary Monthly Electric Generator Inventory

Attributes
Attribute	Value
Gem	Parents Name Otter Tail Corp Share pct 53.90 Gem entity id E100002007932 Name NorthWestern Energy Group Inc Share pct 23.40 Gem entity id E100000150310 Name small shareholder(s) Share pct 19.20 Gem entity id E100001015587 Name The Vanguard Group Inc Share pct 2.90 Gem entity id E100001010595 Name Barrow, Hanley, Mewhinney & Strauss LLC Share pct 0.300 Gem entity id E100002017617 Name Blackrock Advisors LLC Share pct 0.100 Gem entity id E100001015833 Name State Street Corp Share pct 0.100 Gem entity id E100001010596 Name Washington H Soul Pattinson and Company Co Ltd Share pct 0.100 Gem entity id E100001010431 Unit ids G100000100861 Location id L100000104183
Grid	Nerc region MRO Report year 2025 Grid voltage kv 230 Transmission owner Otter Tail Power Co Balancing authority code MISO Balancing authority name Midcontinent Independent Transmission System Operator, Inc..
EPA greenhouse gas reporting (GHGRP)	EPA FRS ID 110070834568 Subparts reported C, D NAICS code 221112 Subpart PP (CO2 supply) No Subpart RR (geologic sequestration) No Subpart UU (CO2 injection) No Reporting year 2023 GHGRP facility ID 1001027
Eia status	By code OP Mw 450 Units 1 SB Mw 1 Units 1 Standby mw 1 Status rule some_units_idle In service mw 451 Out of service mw 0
Fuel burned (MMBtu), 2025	22,513,185
Capacity factor, 2025	0.514
Heat rate (Btu/kWh), 2025	11,092.6
Net generation (MWh), 2025	2,029,575.0
Balancing authority code	MISO

6 companies

Companies with an ownership or operating interest in this asset.
Company	Role	Share	As of	Source
Otter Tail Power Co	Operator			EIA-860M
OTTER TAIL CORP	Owner	53.9%	31 Dec 2023	EPA GHGRP
NORTHWESTERN CORP	Owner	23.4%	31 Dec 2023	EPA GHGRP
MDU RESOURCES GROUP INC	Owner	22.7%	31 Dec 2023	EPA GHGRP
Montana-Dakota Utilities Co	Owner	22.7%	31 Dec 2025	EIA-860
NorthWestern Energy - (SD)	Owner	23.4%	31 Dec 2025	EIA-860
Otter Tail Power Co	Owner	53.9%	31 Dec 2025	EIA-860

6 sources

Sources

EIA-860M Preliminary Monthly Electric Generator InventoryOpen license · retrieved 4 Nov 2026
Global Energy Monitor — Global Integrated Power Tracker (unit-level power plants, eight technologies, all statuses)Open license, with credit · retrieved 26 Oct 2026Global Integrated Power Tracker, Global Energy Monitor, September 2026 release (https://globalenergymonitor.org/projects/global-integrated-power-tracker), CC BY 4.0. Modified by Inframation: TransitionZero-sourced rows removed; statuses and technologies mapped to Inframation's vocabulary; figures aggregated. Copyright © Global Energy Monitor. Global Integrated Power Tracker, September 2026 release. Distributed under a Creative Commons Attribution 4.0 International License.
EIA Open Data bulk file — Electricity (ELEC.zip; monthly plant net generation and fuel consumption since 2001)Open license · retrieved 1 Nov 2026Source: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)
EIA-860M Preliminary Monthly Electric Generator Inventory
EPA Greenhouse Gas Reporting Program — facility register with parent-company shares (Envirofacts pub_dim_facility; FLIGHT)
EIA-860 Annual Electric Generator Report — Schedule 4 Owner (ownership shares per generator), plus Plant/Generator schedules