Hydrogen fluoride
Hydrogen fluoride at Otter Tail Power CO Big Stone Plant have more than three-quarters since 2010 (through 2024).
TRI facility · TRI 2024 reporting year
Otter Tail Power CO Big Stone Plant
Total reported releases 383k lb held roughly steady year over year (+4%). Total releases concentrations have more than halved since 2010.
48450 144TH ST, Big Stone City, South Dakota · 221112 · Electric Utilities · operated by Otter Tail CORP
Anomaly engine
Notable Signals
Total reported releases
Total reported releases at Otter Tail Power CO Big Stone Plant have more than halved since 2010 (through 2024).
Chemicals reported · most recent year
What This Facility Releases
Barium compounds (except for barium sulfate (CAS No. 7727-43-7))
Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) concentrations have fallen 42% since 2010.
Manganese compounds
Manganese compounds concentrations have fallen 36% since 2010.
Ammonia
Ammonia concentrations have fallen 26% since 2016.
Lead compounds
Lead compounds concentrations have more than halved since 2010.
Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)
Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) concentrations have more than halved since 2010.
Hydrogen fluoride
Hydrogen fluoride concentrations have more than halved since 2010.
Mercury compounds
Mercury compounds concentrations have more than halved since 2010.
Dioxin and dioxin-like compounds
Dioxin and dioxin-like compounds volumes here are too small to anchor a multi-year trend; YoY movement is still shown above.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Grant County County, SD (no Census block groups within 3 miles — falling back to containing county): a population of 7,533. Why we surface this →
9.8%
Low-income
7.8%
People of color
6.3%
Under age 5
23.0%
Over age 64
Source: Census ACS 2018-2022 (5-year), county-level fallback. Indicator-level percentile and EJ-disparity scores are surfaced on the county page and the state page — they describe wider regional exposure burdens, not effects attributable to a single facility.
Source. EPA Toxics Release Inventory · retrieved 2026-05-07. Reporting year 2024. TRI is a federal public-domain dataset under 17 USC §105.
What this is not. TRI quantifies releases reported by the facility under EPCRA §313 — not ambient air or water concentrations measured at receptors. We do not attribute individual health outcomes to specific facilities; that exceeds what the data can support.