EPA TRI Facility · Electric Utilities
Black Hills Corp - Neil Simpson Complex
Gillette, WY · Parent: Black Hills Corp
- Total releases
- 8.7M lbs
- Chemicals reported
- 12
- Carcinogens
- 3
- Primary pathway
- Land Disposal
Black Hills Corp - Neil Simpson Complex has reported 8.7M lbs of toxic releases across 12 chemicals to the EPA Toxic Release Inventory, based on annual facility disclosures from 2019 through 2023. Of the chemicals reported, 3 are classified as carcinogens, representing 25% of the facility's chemical profile. The facility operates in the Electric Utilities sector. The primary release pathway is land disposal, accounting for 98% of total releases. All release data shown below is self-reported to the EPA under the Emergency Planning and Community Right-to-Know Act (EPCRA) Section 313.
Black Hills Corp - Neil Simpson Complex files annual Form R disclosures to the EPA Toxics Release Inventory under EPCRA Section 313, classified under NAICS 221112 (Electric Utilities). Across 5 years of records spanning 2019–2023, the site has disclosed 8.7M lbs in cumulative toxic releases across 12 distinct chemicals, 3 of which (25%) carry a carcinogenic classification.
The dominant release pathway is land disposal at 8.5M lbs (98.2% of total volume), followed by air releases at 1.8%. Between 2019 and 2023, reported totals decreased by 19% - from 1.9M lbs to 1.5M lbs. The facility is operated under parent company Black Hills Corp.
TRI Form R values are self-reported estimates, not measured stack emissions, and treat every pound of reported chemical equally regardless of toxicity. Inclusion in the TRI database does not establish a health risk to nearby residents; it documents the annual reporting record that Black Hills Corp - Neil Simpson Complex has filed with the EPA under federal community right-to-know requirements.
Quick Facts
Compare this facility
See how Black Hills Corp - Neil Simpson Complex stacks up against nearby facilities and the typical reporter.
68% less than the comparison
50% more than the comparison
Comparison reflects reported pounds and chemical counts, not toxicity or health risk. Averages cover facilities reporting any release.
How does this facility release toxic chemicals?
How Black Hills Corp - Neil Simpson Complex releases toxic chemicals into the environment. Total: 8.7M lbs.
Emissions Trend Summary
From 2019 to 2023, total releases decreased by 19% (1.9M lbs to 1.5M lbs).
Reported total releases by year
Black Hills Corp - Neil Simpson Complex - annual TRI totals
- 2019
2019
2 million lbs
- 2020
2020
2 million lbs
- 2021
2021
2 million lbs
- 2022
2022
2 million lbs
- 2023
2023
2 million lbs
What this shows Year-over-year reported totals. TRI figures are self-reported estimates and can swing with production levels, waste-rock handling and reporting changes, not only with emissions controls.
| Year | Total | Chemicals |
|---|---|---|
| 2019 | 1.9M lbs | 11 |
| 2020 | 1.8M lbs | 11 |
| 2021 | 1.6M lbs | 11 |
| 2022 | 1.9M lbs | 11 |
| 2023 | 1.5M lbs | 11 |
Chemical Releases
Aggregated across all reporting years (2019–2023). 3 of 12 chemicals are carcinogens. Sorted by total release volume.
| Chemical | Total | Flags |
|---|---|---|
| Barium And Barium Compounds | 3.7M lbs | - |
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 2.9M lbs | - |
| Manganese | 482.9K lbs | - |
| Copper | 372.7K lbs | - |
| Vanadium (except when contained in an alloy) | 370.7K lbs | - |
| Zinc (fume or dust) | 256.8K lbs | - |
| Chromium | 176.4K lbs | - |
| Nickel | 154.3K lbs | Carcinogen |
| Ammonia | 149.9K lbs | - |
| Lead | 103.4K lbs | Carcinogen |
| Mercury | 3.5K lbs | - |
| Dioxin and dioxin-like compounds | 4 lbs | Carcinogen |
Location
Other Facilities in Wyoming
About TRI Data
Data as of 2023 reporting year. Source: U.S. Environmental Protection Agency (EPA) Toxic Release Inventory.
Data comes from the EPA Toxic Release Inventory (TRI) program. Facilities that manufacture, process, or otherwise use listed toxic chemicals above threshold amounts are required to report annually to the EPA.
Release quantities are self-reported by the facility and may represent estimates rather than exact measurements. "Total releases" includes releases to air, water, land, and off-site transfers for disposal. Quantities shown here are aggregated across all available reporting years.
PlainEnviro presents this data without advocacy framing. The presence of a facility in the TRI database does not by itself indicate a health risk. For site-specific health questions, consult your local environmental or health agency.
Frequently Asked Questions
What chemicals does Black Hills Corp - Neil Simpson Complex release? ▼
What industry is Black Hills Corp - Neil Simpson Complex in? ▼
How long has Black Hills Corp - Neil Simpson Complex reported to the TRI? ▼
How does Black Hills Corp - Neil Simpson Complex release toxic chemicals? ▼
Are emissions from Black Hills Corp - Neil Simpson Complex increasing or decreasing? ▼
Is Black Hills Corp - Neil Simpson Complex a health risk? ▼
Does Black Hills Corp - Neil Simpson Complex release carcinogens? ▼
Explore More Data for Wyoming
What to do with this facility's data
Use this facility profile as a starting point, then check how it compares.
- See whether releases reported by Black Hills Corp - Neil Simpson Complex are rising or falling over time. View trends
- This facility ranks #248 of 25,902 TRI facilities nationwide by total reported releases - among the top 1% of reporting sites by volume. Ranking reflects reported pounds, not toxicity or health risk. See the full rankings
- Check Wyoming's statewide profile for the full picture: total facilities, water systems, and Superfund sites. View Wyoming profile
TRI release totals are self-reported estimates submitted to the EPA, not independently measured stack emissions; a high rank reflects reported volume, not necessarily local health risk.
Read our methodology - how this data is sourced, computed, and verified.
Related
Sources & how this page was built
Every figure on this page traces to public, federal-government data on Black Hills Corp - Neil Simpson Complex. The records below are the primary sources; our methodology explains how they are joined, computed, and verified.
- EPA Toxics Release Inventory (TRI) Basic Data Files - annual self-reported chemical-release filings. epa.gov
- EPA TRI Program, chemical & reporting reference - what each chemical is and how releases are counted. epa.gov
- EPA Facility Registry Service (FRS) - authoritative facility location and identity. epa.gov
- EPA Enforcement & Compliance History Online (ECHO) - regulatory and compliance context. echo.epa.gov
- EPA Envirofacts - the EPA data warehouse that exposes these datasets. enviro.epa.gov
Retrieved and formatted by PlainEnviro Editorial. TRI release totals are self-reported estimates, not measured stack emissions.
According to the U.S. Environmental Protection Agency, the Toxics Release Inventory has required annual industrial disclosure since its creation under the Emergency Planning and Community Right-to-Know Act in October 1986, and this facility's record is drawn from PlainEnviro's database of more than 25,000 EPA-tracked facilities through the 2023 reporting year; see our methodology for full source citations and refresh cadence.