TRI Reporter
Clean Air Act
RCRA
OTTER TAIL POWER CO - BIG STONE POWER PLANT
Quick Summary
- •Released 496,385 lbs of toxic chemicals to the environment in the most recent TRI reporting year.
- •Assessed $0 in total penalties since records began.
- •Reports releases of chemicals classified as known or probable carcinogens.
- Address
-
48450 144TH ST
BIG STONE, SD 57216
View on map ↗ - County
- GRANT County
- Industry
- Utilities
- NAICS (North American Industry Classification)
- 221112
- Inspections
- 13 · last Sep 10, 2025
- Total Penalties
- $0 · last Dec 21, 2010
- Registry ID
- 110011493437
How This Compares
#3
of 84 TRI reporters in SD
#147
of 584 TRI reporters in Utilities
Ranked by most recent year's total TRI releases.
TRI Toxic Chemical Releases
Annual pounds of each toxic chemical released to air, water, and land, as reported to the EPA Toxic Release Inventory. Carcinogen (♦) and PFAS designations are per EPA and IARC classifications.
Emissions Trend (2015–2024)
-13% overall
| Year | Total Releases (lbs) | vs Prior Year |
|---|---|---|
| 2015 | 438,870 | — |
| 2016 | 762,730 | +74% |
| 2017 | 496,385 | -35% |
| 2018 | 601,434 | +21% |
| 2019 | 672,797 | +12% |
| 2020 | 329,334 | -51% |
| 2021 | 380,281 | +15% |
| 2022 | 459,593 | +21% |
| 2023 | 369,404 | -20% |
| 2024 | 382,613 | +4% |
2024
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 349,935 | 935 | — | 349,000 | — | |
| Manganese compounds | 15,183 | 83 | — | 15,100 | — | |
| Ammonia | 9,133 | 8,870 | — | 263 | — | |
| Lead compounds | 3,221 | 70 | — | 3,150 | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 3,130 | 3,130 | — | — | — | |
| Hydrogen fluoride | 1,920 | 1,920 | — | — | — | |
| Mercury compounds | 91 | 8 | — | 83 | — | |
| Dioxin and dioxin-like compounds | 0 | 0 | — | — | — | ♦ Carcinogen |
| Benzo[g,h,i]perylene | 0 | 0 | — | — | — |
2023
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 337,929 | 929 | — | 337,000 | — | |
| Manganese compounds | 14,584 | 84 | — | 14,500 | — | |
| Ammonia | 8,710 | 8,460 | — | 250 | — | |
| Lead compounds | 3,150 | 70 | — | 3,080 | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 3,070 | 3,070 | — | — | — | |
| Hydrogen fluoride | 1,880 | 1,880 | — | — | — | |
| Mercury compounds | 81 | 6 | — | 75 | — | |
| Dioxin and dioxin-like compounds | 0 | 0 | — | — | — | ♦ Carcinogen |
| Benzo[g,h,i]perylene | 0 | 0 | — | — | — |
2022
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 406,954 | 954 | — | 406,000 | — | |
| Manganese compounds | 17,691 | 91 | — | 17,600 | — | |
| Vanadium compounds | 14,746 | 46 | — | 14,700 | — | |
| Ammonia | 10,023 | 9,730 | — | 293 | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 3,930 | 3,930 | — | — | — | |
| Lead compounds | 3,690 | 80 | — | 3,610 | — | |
| Hydrogen fluoride | 2,410 | 2,410 | — | — | — | |
| Mercury compounds | 149 | 10 | — | 139 | — | |
| Dioxin and dioxin-like compounds | 0 | 0 | — | — | — | ♦ Carcinogen |
| Benzo[g,h,i]perylene | 0 | 0 | — | — | — |
2021
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 347,904 | 904 | — | 347,000 | — | |
| Manganese compounds | 15,083 | 83 | — | 15,000 | — | |
| Ammonia | 8,596 | 8,350 | — | 246 | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 3,380 | 3,380 | — | — | — | |
| Lead compounds | 3,170 | 69 | — | 3,100 | — | |
| Hydrogen fluoride | 2,080 | 2,080 | — | — | — | |
| Mercury compounds | 68 | 10 | — | 58 | — | |
| Dioxin and dioxin-like compounds | 0 | 0 | — | — | — | ♦ Carcinogen |
| Benzo[g,h,i]perylene | 0 | 0 | — | — | — |
2020
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 298,908 | 908 | — | 298,000 | — | |
| Manganese compounds | 12,884 | 84 | — | 12,800 | — | |
| Ammonia | 8,676 | 8,420 | — | 256 | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 3,500 | 3,500 | — | — | — | |
| Lead compounds | 3,091 | 71 | — | 3,020 | — | |
| Hydrogen fluoride | 2,150 | 2,150 | — | — | — | |
| Mercury compounds | 125 | 5 | — | 120 | — | |
| Dioxin and dioxin-like compounds | 0 | 0 | — | — | — | ♦ Carcinogen |
| Benzo[g,h,i]perylene | 0 | 0 | — | — | — |
2019
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 579,132 | 1,132 | — | 578,000 | — | |
| Manganese compounds | 25,209 | 109 | — | 25,100 | — | |
| Vanadium compounds | 20,872 | 72 | — | 20,800 | — | |
| Copper compounds | 20,790 | 86 | — | 20,704 | — | |
| Ammonia | 12,964 | 12,580 | — | 384 | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 5,320 | 5,320 | — | — | — | |
| Lead compounds | 5,075 | 105 | — | 4,970 | — | |
| Hydrogen fluoride | 3,270 | 3,270 | — | — | — | |
| Mercury compounds | 165 | 13 | — | 152 | — | |
| Dioxin and dioxin-like compounds | 1 | 1 | — | — | — | ♦ Carcinogen |
| Benzo[g,h,i]perylene | 0 | 0 | — | — | — |
2018
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 518,184 | 1,184 | — | 517,000 | 3,350 | |
| Manganese compounds | 22,600 | 100 | — | 22,500 | 147 | |
| Vanadium compounds | 18,675 | 75 | — | 18,600 | 124 | |
| Copper compounds | 18,392 | 87 | — | 18,305 | 139 | |
| Ammonia | 11,537 | 11,200 | — | 337 | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 4,620 | 4,620 | — | — | — | |
| Lead compounds | 4,433 | 93 | — | 4,340 | 39 | |
| Hydrogen fluoride | 2,840 | 2,840 | — | — | — | |
| Mercury compounds | 153 | 14 | — | 139 | 1 | |
| Dioxin and dioxin-like compounds | 0 | 0 | — | — | — | ♦ Carcinogen |
| Benzo[g,h,i]perylene | 0 | 0 | — | — | — |
2017
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 432,966 | 966 | — | 432,000 | 33,900 | |
| Manganese compounds | 18,866 | 66 | — | 18,800 | 1,500 | |
| Vanadium compounds | 15,652 | 52 | — | 15,600 | 1,260 | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 12,300 | 12,300 | — | — | — | |
| Ammonia | 10,464 | 10,150 | — | 314 | — | |
| Lead compounds | 3,696 | 86 | — | 3,610 | 391 | |
| Hydrogen fluoride | 2,310 | 2,310 | — | — | — | |
| Mercury compounds | 130 | 12 | — | 118 | 13 | |
| Dioxin and dioxin-like compounds | 0 | 0 | — | — | — | ♦ Carcinogen |
| Benzo[g,h,i]perylene | 0 | 0 | — | — | — |
2016
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 679,698 | 698 | — | 679,000 | 4,140 | |
| Manganese compounds | 26,845 | 45 | — | 26,800 | 156 | |
| Vanadium compounds | 22,936 | 36 | — | 22,900 | 144 | |
| Ammonia | 12,371 | 12,020 | — | 351 | — | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 12,300 | 12,300 | — | — | — | |
| Lead compounds | 6,096 | 86 | — | 6,010 | 61 | |
| Hydrogen fluoride | 2,300 | 2,300 | — | — | — | |
| Mercury compounds | 183 | 11 | — | 172 | 2 | |
| Dioxin and dioxin-like compounds | 0 | 0 | — | — | — | ♦ Carcinogen |
| Benzo[g,h,i]perylene | 0 | 0 | — | — | — |
2015
| Chemical | Total (lbs) | Air | Water | Land | Off-Site | |
|---|---|---|---|---|---|---|
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 395,913 | 913 | — | 395,000 | 58,998 | |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 29,300 | 29,300 | — | — | — | |
| Hydrogen fluoride | 9,280 | 9,280 | — | — | — | |
| Lead compounds | 3,248 | 67 | — | 3,180 | 1,017 | |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 1,010 | 1,010 | — | — | — | |
| Mercury compounds | 119 | 111 | — | 8 | 3 | |
| Dioxin and dioxin-like compounds | 0 | 0 | — | — | — | ♦ Carcinogen |
| Benzo[g,h,i]perylene | 0 | 0 | — | — | — |
Waste Management & Recycling
How this facility manages toxic chemicals beyond direct releases — through recycling, energy recovery, and on-site or off-site treatment. Data from the most recent TRI reporting year. Quantities in pounds.
| Chemical | Released | Recycled | Energy Recovery | Treated |
|---|---|---|---|---|
| Ammonia | — | — | — | 22,600 |
| Hydrogen fluoride | — | — | — | 95,300 |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | — | — | — | 24,200 |
Off-Site Transfer Destinations
Facilities to which toxic chemicals were transferred for disposal, recycling, energy recovery, or treatment during the most recent TRI reporting year. Quantities in pounds.
| Destination | Chemical | Disposal | Recycling | Energy Rec. | Treatment |
|---|---|---|---|---|---|
|
HEADWATERS RESOURCES
MOORHEAD, MN
|
Lead compounds | 391 | — | — | — |
|
HEADWATERS RESOURCES
MOORHEAD, MN
|
Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 33,900 | — | — | — |
|
HEADWATERS RESOURCES
MOORHEAD, MN
|
Mercury compounds | 13 | — | — | — |
|
HEADWATERS RESOURCES
MOORHEAD, MN
|
Vanadium compounds | 1,260 | — | — | — |
|
HEADWATERS RESOURCES
MOORHEAD, MN
|
Manganese compounds | 1,500 | — | — | — |
Compliance Violations
Individual permit violations recorded by the EPA across air, water, and hazardous waste programs. Open violations are unresolved as of the most recent ECHO data update.
| Program | Type | Violation Date | Return to Compliance | Status |
|---|---|---|---|---|
| caa | FRV | Aug 10, 2022 | — | Open |
| caa | FRV | Apr 26, 2022 | — | Open |
| caa | FRV | Jun 22, 2021 | — | Open |
| caa | FRV | Jul 29, 2020 | — | Open |
| caa | HPV | Aug 31, 2018 | Jul 10, 2019 | Resolved |
| rcra | Standards Applicable to Generators of HW: General | Oct 17, 1996 | Nov 6, 1996 | Resolved |
Enforcement Actions
Formal enforcement cases brought by the EPA or state agencies, including administrative orders and civil penalties assessed. Penalty amounts reflect what was formally assessed, not necessarily what was collected.
Administrative - Formal
Clean Air Act
· Case 3601905073 · Jun 4, 2019
$0
Judicial
· Case 08-2005-0179 · Dec 21, 2010
$75,000
WRITTEN INFORMAL
RCRA (Hazardous Waste)
· Case RCRA-SDD071788707-000 · Oct 17, 1996
Judicial
· Case 08-1979-0004 · May 20, 1981
$10,000
Other facilities in GRANT County, SD
BLOOMING VALLEY DAIRY
SUMMIT, SD
· Construction
LABOLT, TOWN OF
LABOLT, SD
· Utilities
MILBANK
, SD
WESTERN CONSOLIDATED COOPERATIVE
TWIN BROOKS, SD
SAPUTO CHEESE USA INC
BIG STONE CITY, SD
· Manufacturing