EPA TRI Facility · Electric Utilities
Hardin Generating Station
Hardin, MT · Parent: Rocky Mountain Power LLC
- Total releases
- 530.0K lbs
- Chemicals reported
- 16
- Carcinogens
- 2
- Primary pathway
- Off-site Transfers
OFFSITE Form-R mix
Hardin Generating Station: how the 530.0K lbs splits
530.0K lbs across all reported pathways
- Off-site Transfers 415.8K lbs 78.5%
- Air Releases 114.2K lbs 21.5%
- Land Disposal 0 lbs <0.1%
Hardin Generating Station's 530.0K lbs Form-R total is OFFSITE - off-site transfers is 78.5% of the bar. Next segment: air releases at 21.5%. 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.
MID volume OFFSITE pathway TRACE-CARC
Hardin Generating Station is an EPA Toxics Release Inventory reporter in Hardin, MT, in the electric utilities sector. It reported 114.5K lbs of releases across 10 chemicals in 2023, and 530.0K lbs in total across its 2019-2023 reporting years. That ranks 1,876 of 25,986 TRI facilities nationwide by cumulative reported pounds, counting each facility over however many years it has filed. In Montana's 67 reporting TRI sites, pounds #1 is not chemical-count #1. Hardin Generating Station is pounds #14 and chemical-count #7 at 530.0K lbs. Montana Resources LLC leads reported pounds (215.2M lbs) at 12 chemicals (chemical-count #11). Phillips 66 Co Billings Refinery leads chemical count at 39 chemicals (465.0K lbs, pounds #16). Reported volume fell against 2022. Pounds reported are not a measure of toxicity or health risk. Nearest other TRI reporters: Montana Sulphur & Chemical Co; Par Montana Billings Refinery; Knife River Billings East Site; Loveland Products Inc-Billings (formerly Transbas). Similar-scale Electric Utilities peers outside Montana: Baldwin Energy Complex; Polk Power Station; Dominion Energy South Carolina - Jasper Generating Station; Ameren Missouri Meramec Energy Center. Largest disclosed chemicals by pounds: Barium And Barium Compounds; Manganese; Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size); Barium compounds (except for barium sulfate (CAS No. 7727-43-7)).
Hardin Generating Station stamps MID volume with a dominant OFFSITE pathway (78.5% off-site transfers) across 16 chemicals · 2 carcinogen-classified. Cumulative Form-R extract: 530.0K lbs (2019–2023). All figures are self-reported EPCRA §313 estimates, not measured stack emissions or a health-risk score. Scale peers include Baldwin Energy Complex and Polk Power Station.
Hardin Generating Station vs. every reporting TRI facility
Cumulative reported release pounds, with this facility marked in the national distribution
530K lbs Top 7% higher than 93% 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
Hardin Generating Station inside Big Horn's TRI pounds
Among the 513 Electric Utilities facilities in this database, Hardin Generating Station reports the 239th-largest volume (530.0K lbs). This one site accounts for more than 99.9% of every pound reported in Big Horn. Scale peers outside Montana include Baldwin Energy Complex and Polk Power Station.
County-dominant here means ≥25% of Big Horn's reported pounds (530.0K lbs county total). Shares only print when the site reports ≥1,000 lbs.
Annual disclosure change
What changed: EPA TRI 2023 reporting year
- Hardin Generating Station's total reported releases fell from 176.8 thousand lb in 2022 to 114.5 thousand lb in 2023, based on EPA TRI filings.
- Hardin Generating Station's off-site transfers fell from 138.6 thousand lb in 2022 to 84.8 thousand lb in 2023, based on EPA TRI filings.
- Hardin Generating Station's air releases fell from 38.2 thousand lb in 2022 to 29.6 thousand lb in 2023, based on EPA TRI filings.
Hardin Generating Station Form-R facts
Compare this facility
See how Hardin Generating Station stacks up against nearby facilities and the typical reporter.
7.0× more than the comparison
5.3× 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 Hardin Generating Station releases toxic chemicals into the environment. Total: 530.0K lbs.
Emissions Trend Summary
From 2019 to 2023, total releases increased by 265% (31.4K lbs to 114.5K lbs).
Hardin Generating Station: annual Form-R pounds
MID site · OFFSITE pathway · TRI years 2019–2023
- 2019 0
- 2020 0
- 2021 0
- 2022 0
- 2023 0
What this shows Hardin Generating Station year-over-year reported totals (increased by 265% 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 | 31.4K lbs | 10 |
| 2020 | 9.0K lbs | 6 |
| 2021 | 198.3K lbs | 10 |
| 2022 | 176.8K lbs | 10 |
| 2023 | 114.5K lbs | 10 |
Chemical Releases
Aggregated across all reporting years (2019–2023). 2 of 16 chemicals are carcinogens. Sorted by total release volume.
| Chemical | Total | Flags |
|---|---|---|
| Barium And Barium Compounds | 282.5K lbs | - |
| Manganese | 111.5K lbs | - |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 88.8K lbs | - |
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 14.3K lbs | - |
| Zinc compounds | 8.7K lbs | - |
| Copper | 8.2K lbs | - |
| Manganese compounds | 7.4K lbs | - |
| Lead And Lead Compounds | 5.1K lbs | - |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 1.1K lbs | - |
| Hydrogen fluoride | 1.1K lbs | - |
| Copper compounds | 722 lbs | - |
| Lead compounds | 437 lbs | - |
| Arsenic And Arsenic Compounds | 50 lbs | Carcinogen |
| Mercury And Mercury Compounds | 38 lbs | - |
| Mercury compounds | 5 lbs | - |
| Dioxin and dioxin-like compounds | 0 lbs | Carcinogen |
Hardin Generating Station · OFFSITE-pathway site
Nearest TRI Facilities to Hardin Generating Station
Closest other reporters in Montana - including Montana Sulphur & Chemical Co, Par Montana Billings Refinery, Knife River Billings East Site, ordered by distance.
Showing 8 of 66 other reporting facilities in Montana.
Similar Electric Utilities Facilities
Other Electric Utilities facilities with similar total release volumes (±80%), outside Montana - e.g. Baldwin Energy Complex, Polk Power Station, Dominion Energy South Carolina - Jasper Generating Station.
Compare beyond Montana
Nationwide peers by reported pounds & chemical count
Cross-state TRI reporters nearest Hardin Generating Station on cumulative reported pounds (530.0K lbs) and distinct chemical count (16). Release-pound peers include US Army National Guard Camp Blanding Ranges, US Army National Guard Fort Pickett (ranges), Olin Winchester LLC Main Plant. Chemical-count peers include Surpass Chemical Co. Inc., The Federal Metal Co, Wheelabrator Frackville Energy Co Inc. 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.
- US Army National Guard Camp Blanding Ranges Starke, FL · Other 530.0K lbs reported
- US Army National Guard Fort Pickett (ranges) Blackstone, VA · Other 529.5K lbs reported
- Olin Winchester LLC Main Plant East Alton, IL · Fabricated Metals 529.5K lbs reported
- Creative Liquid Coatings Inc. Kendallville, IN · Plastics and Rubber 530.7K lbs reported
Similar chemical count
Nearest out-of-state reporters by distinct Form-R chemicals (deduped against the release-pound neighborhood).
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, Manganese, Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size), Barium compounds (except for barium sulfate (CAS No. 7727-43-7)); nearby reporters include Montana Sulphur & Chemical Co. Hardin Generating Station stamps MID volume · OFFSITE pathway · TRACE-CARC 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 Hardin Generating Station TRI extract (MID · OFFSITE · TRACE-CARC · lead Barium And Barium Compounds) joins EPA Form-R filings with facility identity - reported pounds, not a health-risk rating.
Hardin Generating Station totals are self-reported EPCRA §313 estimates for Hardin, MT, latest year 2023. Form-R rows span 2019–2023 (5 years). NAICS 221112 · Electric Utilities. more than 99.9% of Big Horn TRI pounds in this extract. Nearest ABS peer: US Army National Guard Camp Blanding Ranges (Δ 15 lbs). Pounds ≠ exposure.
Hardin Generating Station stamps MID volume · OFFSITE pathway · TRACE-CARC · 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