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
LAND Form-R mix
Black Hills Corp - Neil Simpson Complex: how the 8.7M lbs splits
8.7M lbs across all reported pathways
- Land Disposal 8.5M lbs 98.2%
- Air Releases 157.8K lbs 1.8%
- Water Discharges 1.7K lbs <0.1%
Black Hills Corp - Neil Simpson Complex's 8.7M lbs Form-R total is LAND - land disposal is 98.2% of the bar. Next segment: air releases at 1.8%. Leading chemical by pounds: Barium And Barium Compounds.
Carcinogen-classified pounds vs other reported pounds
Same cumulative TRI total as above, split by EPA/IARC carcinogen classification on each chemical: pounds share, not chemical count. Classification is not a site health-risk score.
HEAVY volume LAND pathway CARC-LEAN
Black Hills Corp - Neil Simpson Complex is an EPA Toxics Release Inventory reporter in Gillette, WY, in the electric utilities sector. It reported 1.5M lbs of releases across 11 chemicals in 2023, and 8.7M lbs in total across its 2019-2023 reporting years. That ranks 248 of 25,986 TRI facilities nationwide by cumulative reported pounds, counting each facility over however many years it has filed. In Wyoming's 70 reporting TRI sites, pounds #1 is not chemical-count #1. Black Hills Corp - Neil Simpson Complex is pounds #4 and chemical-count #14 at 8.7M lbs. Dyno Nobel Inc-Cheyenne Plant leads reported pounds (27.1M lbs) at 8 chemicals (chemical-count #19). Hf Sinclair Parco Refining LLC leads chemical count at 36 chemicals (1.5M lbs, pounds #10). Reported volume fell against 2022. Pounds reported are not a measure of toxicity or health risk. Nearest other TRI reporters: Pacificorp Wyodak Plant; Joy Global Gillette Wy; 50 Buttes; Basin Electric Dry Fork Station. Similar-scale Electric Utilities peers outside Wyoming: San Miguel Electric Cooperative Inc; Midamerican Energy Co Walter Scott Jr Energy Center; Public Service Co of Colorado Comanche Station; Jeffrey Energy Center. Largest disclosed chemicals by pounds: Barium And Barium Compounds; Barium compounds (except for barium sulfate (CAS No. 7727-43-7)); Manganese; Copper.
Black Hills Corp - Neil Simpson Complex stamps HEAVY volume with a dominant LAND pathway (98.2% land disposal) across 12 chemicals · 3 carcinogen-classified. Cumulative Form-R extract: 8.7M lbs (2019–2023). All figures are self-reported EPCRA §313 estimates, not measured stack emissions or a health-risk score. Scale peers include San Miguel Electric Cooperative Inc and Midamerican Energy Co Walter Scott Jr Energy Center.
Black Hills Corp - Neil Simpson Complex vs. every reporting TRI facility
Cumulative reported release pounds, with this facility marked in the national distribution
8.7M lbs Top 1% higher than 99% of 25,986 reporting TRI facilities
Each bar is a $1M-wide band; taller bars hold more reporting TRI facilities. The dashed line and filled bar mark this facility. Hover, focus, or tap a bar for its full count, share, and position.
Source U.S. Environmental Protection Agency, Toxics Release Inventory · 2023 reporting year
Black Hills Corp - Neil Simpson Complex inside Campbell's TRI pounds
Among the 513 Electric Utilities facilities in this database, Black Hills Corp - Neil Simpson Complex reports the 37th-largest volume, placing it in the top 7.2% of its sector. This one site accounts for 45.2% of every pound reported in Campbell. Scale peers outside Wyoming include San Miguel Electric Cooperative Inc and Midamerican Energy Co Walter Scott Jr Energy Center.
County-dominant here means ≥25% of Campbell's reported pounds (19.2M lbs county total). Shares only print when the site reports ≥1,000 lbs.
Annual disclosure change
What changed: EPA TRI 2023 reporting year
- Black Hills Corp - Neil Simpson Complex's total reported releases fell from 1.9 million lb in 2022 to 1.5 million lb in 2023, based on EPA TRI filings.
- Black Hills Corp - Neil Simpson Complex's land releases fell from 1.9 million lb in 2022 to 1.5 million lb in 2023, based on EPA TRI filings.
Black Hills Corp - Neil Simpson Complex Form-R facts
Compare this facility
See how Black Hills Corp - Neil Simpson Complex stacks up against nearby facilities and the typical reporter.
2.2× more than the comparison
37% less 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).
Black Hills Corp - Neil Simpson Complex: annual Form-R pounds
HEAVY site · LAND pathway · TRI years 2019–2023
- 2019
- 2020
- 2021
- 2022
- 2023
What this shows Black Hills Corp - Neil Simpson Complex year-over-year reported totals (decreased by 19% from 2019 to 2023). TRI figures are self-reported estimates and can swing with production, waste handling, and reporting changes, not only with controls. Lead chemical in the extract: Barium And Barium Compounds.
| 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 | 0 lbs | Carcinogen |
Black Hills Corp - Neil Simpson Complex · LAND-pathway site
Nearest TRI Facilities to Black Hills Corp - Neil Simpson Complex
Closest other reporters in Wyoming - including Pacificorp Wyodak Plant, Joy Global Gillette Wy, 50 Buttes, ordered by distance.
Showing 8 of 69 other reporting facilities in Wyoming.
Similar Electric Utilities Facilities
Other Electric Utilities facilities with similar total release volumes (±80%), outside Wyoming - e.g. San Miguel Electric Cooperative Inc, Midamerican Energy Co Walter Scott Jr Energy Center, Public Service Co of Colorado Comanche Station.
Compare beyond Wyoming
Nationwide peers by reported pounds & chemical count
Cross-state TRI reporters nearest Black Hills Corp - Neil Simpson Complex on cumulative reported pounds (8.7M lbs) and distinct chemical count (12). Release-pound peers include Nucor Steel Tuscaloosa Inc, Citgo Petroleum Corp, Georgia-Pacific Monticello LLC. Chemical-count peers include Fmc Agricultural Caribe Industries Ltd, Peerless Oil & Chemicals Inc., Prepa - Aguirre Power Generati on Complex. Neighborhoods are forced disjoint so each axis surfaces a different set of sites.
Similar reported release pounds
Nearest out-of-state reporters (≥1,000 lbs) by absolute TRI pounds, not same-industry or same-county neighbors.
Similar chemical count
Nearest out-of-state reporters by distinct Form-R chemicals (deduped against the release-pound neighborhood).
- Fmc Agricultural Caribe Industries Ltd Manati, PR · Chemicals 12 chemicals
- Peerless Oil & Chemicals Inc. Penuelas, PR · Petroleum Bulk Terminals 12 chemicals
- Prepa - Aguirre Power Generati on Complex Aguirre, PR · Electric Utilities 12 chemicals
- Citgo Petroleum Corp Braintree, MA · Petroleum Bulk Terminals 12 chemicals
About TRI Data
Data as of 2023 reporting year. Source: U.S. Environmental Protection Agency (EPA) Toxic Release Inventory.
On this page the largest disclosed chemicals include Barium And Barium Compounds, Barium compounds (except for barium sulfate (CAS No. 7727-43-7)), Manganese, Copper; nearby reporters include Pacificorp Wyodak Plant. Black Hills Corp - Neil Simpson Complex stamps HEAVY volume · LAND pathway · CARC-LEAN carcinogen-lbs on this Form-R extract. Totals are self-reported estimates under EPCRA §313, not measured stack emissions or a health-risk score.
Use and verify this record
This Black Hills Corp - Neil Simpson Complex TRI extract (HEAVY · LAND · CARC-LEAN · lead Barium And Barium Compounds) joins EPA Form-R filings with facility identity - reported pounds, not a health-risk rating.
Black Hills Corp - Neil Simpson Complex totals are self-reported EPCRA §313 estimates for Gillette, WY, latest year 2023. Form-R rows span 2019–2023 (5 years). NAICS 221112 · Electric Utilities. 45.2% of Campbell TRI pounds in this extract. Nearest ABS peer: Nucor Steel Tuscaloosa Inc (Δ 8.5K lbs). Pounds ≠ exposure.
Black Hills Corp - Neil Simpson Complex stamps HEAVY volume · LAND pathway · CARC-LEAN · lead Barium And Barium Compounds. PlainEnviro renders this EPA Form-R extract from its pipeline; no figure is typed in by an editor. Corrections: editorial policy.
All federal data sources used on this page
- EPA Toxics Release Inventory (TRI) Basic Data Files - annual self-reported chemical-release filings. epa.gov
- EPA TRI Program reference - how chemicals and reported releases are counted. epa.gov
- EPA Facility Registry Service - facility location and identity. epa.gov
- EPA ECHO - regulatory and compliance context. epa.gov
- EPA Envirofacts - the EPA data warehouse exposing these datasets. epa.gov