EPA TRI Facility · Electric Utilities
Weston Power Plant
Mosinee, WI · Parent: Wec Energy Group
- Total releases
- 5.4M lbs
- Chemicals reported
- 14
- Carcinogens
- 2
- Primary pathway
- Off-site Transfers
OFFSITE Form-R mix
Weston Power Plant: how the 5.4M lbs splits
5.4M lbs across all reported pathways
- Off-site Transfers 4.1M lbs 76.7%
- Land Disposal 1.1M lbs 20.2%
- Air Releases 160.0K lbs 3.0%
- Water Discharges 5.9K lbs 0.1%
Weston Power Plant's 5.4M lbs Form-R total is OFFSITE - off-site transfers is 76.7% of the bar. Next segment: land disposal at 20.2%. Leading chemical by pounds: Barium compounds (except for barium sulfate (CAS No. 7727-43-7)).
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 OFFSITE pathway TRACE-CARC
Weston Power Plant is an EPA Toxics Release Inventory reporter in Mosinee, WI, in the electric utilities sector. It reported 749.4K lbs of releases across 14 chemicals in 2023, and 5.4M lbs in total across its 2019-2023 reporting years. That ranks 401 of 25,986 TRI facilities nationwide by cumulative reported pounds, counting each facility over however many years it has filed. In Wisconsin's 836 reporting TRI sites, pounds #1 is not chemical-count #1. Weston Power Plant is pounds #7 and chemical-count #29 at 5.4M lbs. Mullins Cheese Inc leads reported pounds (11.2M lbs) at 3 chemicals (chemical-count #319). Ppg Industries Inc-Oak Creek leads chemical count at 32 chemicals (2.2M lbs, pounds #16). Reported volume fell against 2022. Pounds reported are not a measure of toxicity or health risk. Nearest other TRI reporters: Kerry Inc. Rothschild; Imperial Industries Inc; Epiroc Drilling Tools LLC; Domtar Paper Co LLC. Similar-scale Electric Utilities peers outside Wisconsin: Duke Energy Progress LLC - Roxboro Steam Electric Plant; Basin Electric Dry Fork Station; Thomas Hill Energy Center; La Cygne Generating Station. Other Wec Energy Group sites in this extract: Oak Creek Site; Whitewater Generating Station; Presque Isle Power Plant. Largest disclosed chemicals by pounds: Barium compounds (except for barium sulfate (CAS No. 7727-43-7)); Manganese compounds; Vanadium compounds; Zinc compounds.
Weston Power Plant stamps HEAVY volume with a dominant OFFSITE pathway (76.7% off-site transfers) across 14 chemicals · 2 carcinogen-classified. Cumulative Form-R extract: 5.4M lbs (2019–2023). All figures are self-reported EPCRA §313 estimates, not measured stack emissions or a health-risk score. Scale peers include Duke Energy Progress LLC - Roxboro Steam Electric Plant and Basin Electric Dry Fork Station.
Weston Power Plant vs. every reporting TRI facility
Cumulative reported release pounds, with this facility marked in the national distribution
5.4M lbs Top 2% higher than 98% 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
Weston Power Plant: Barium compounds (except for barium sulfate (CAS No. 7727-43-7))-led volume
Among the 513 Electric Utilities facilities in this database, Weston Power Plant reports the 76th-largest volume, placing it in the top 14.8% of its sector. Its reported volume is concentrated rather than spread: Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) alone is 85.5% of the total. Scale peers outside Wisconsin include Duke Energy Progress LLC - Roxboro Steam Electric Plant and Basin Electric Dry Fork Station.
Concentrated means ≥60% of Weston Power Plant's pounds in one chemical - here Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) at 85.5%. Not a toxicity score.
Annual disclosure change
What changed: EPA TRI 2023 reporting year
- Weston Power Plant's total reported releases fell from 1.0 million lb in 2022 to 749.4 thousand lb in 2023, based on EPA TRI filings.
- Weston Power Plant's land releases fell from 338.0 thousand lb in 2022 to 34.3 thousand lb in 2023, based on EPA TRI filings.
- Weston Power Plant's air releases rose from 13.5 thousand lb in 2022 to 20.6 thousand lb in 2023, based on EPA TRI filings.
- Weston Power Plant's water releases fell from 1.1 thousand lb in 2022 to 1.0 thousand lb in 2023, based on EPA TRI filings.
Weston Power Plant Form-R facts
Compare this facility
See how Weston Power Plant stacks up against nearby facilities and the typical reporter.
4729.8× more than the comparison
7.0× 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 Weston Power Plant releases toxic chemicals into the environment. Total: 5.4M lbs.
Emissions Trend Summary
From 2019 to 2023, total releases decreased by 35% (1.2M lbs to 749.4K lbs).
Weston Power Plant: annual Form-R pounds
HEAVY site · OFFSITE pathway · TRI years 2019–2023
- 2019
- 2020
- 2021
- 2022
- 2023
What this shows Weston Power Plant year-over-year reported totals (decreased by 35% 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 compounds (except for barium sulfate (CAS No. 7727-43-7)).
| Year | Total | Chemicals |
|---|---|---|
| 2019 | 1.2M lbs | 14 |
| 2020 | 1.2M lbs | 14 |
| 2021 | 1.2M lbs | 14 |
| 2022 | 1.0M lbs | 14 |
| 2023 | 749.4K lbs | 14 |
Chemical Releases
Aggregated across all reporting years (2019–2023). 2 of 14 chemicals are carcinogens. Sorted by total release volume.
| Chemical | Total | Flags |
|---|---|---|
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 4.6M lbs | - |
| Manganese compounds | 183.4K lbs | - |
| Vanadium compounds | 148.4K lbs | - |
| Zinc compounds | 133.3K lbs | - |
| Copper compounds | 132.1K lbs | - |
| Hydrogen fluoride | 89.8K lbs | - |
| Ammonia | 39.0K lbs | - |
| Lead compounds | 31.7K lbs | - |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 13.2K lbs | - |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 7.7K lbs | - |
| Mercury compounds | 761 lbs | - |
| Polycyclic aromatic compounds | 49 lbs | Carcinogen |
| Benzo[g,h,i]perylene | 0 lbs | - |
| Dioxin and dioxin-like compounds | 0 lbs | Carcinogen |
Weston Power Plant · OFFSITE-pathway site
Nearest TRI Facilities to Weston Power Plant
Closest other reporters in Wisconsin - including Kerry Inc. Rothschild, Imperial Industries Inc, Epiroc Drilling Tools LLC, ordered by distance.
Showing 8 of 835 other reporting facilities in Wisconsin.
Similar Electric Utilities Facilities
Other Electric Utilities facilities with similar total release volumes (±80%), outside Wisconsin - e.g. Duke Energy Progress LLC - Roxboro Steam Electric Plant, Basin Electric Dry Fork Station, Thomas Hill Energy Center.
Compare beyond Wisconsin
Nationwide peers by reported pounds & chemical count
Cross-state TRI reporters nearest Weston Power Plant on cumulative reported pounds (5.4M lbs) and distinct chemical count (14). Release-pound peers include Duke Energy Progress LLC - Roxboro Steam Electric Plant, Cleveland-Cliffs Riverdale LLC, Madison Industries. Chemical-count peers include Shell New Haven Terminal, Chambers Cogeneration L.P., Avantor Performance Materials. 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.
- Duke Energy Progress LLC - Roxboro Steam Electric Plant Semora, NC · Electric Utilities 5.4M lbs reported
- Cleveland-Cliffs Riverdale LLC Riverdale, IL · Primary Metals 5.4M lbs reported
- Madison Industries Old Bridge, NJ · Chemicals 5.4M lbs reported
- Sappi Cloquet LLC Cloquet, MN · Paper 5.4M lbs reported
Similar chemical count
Nearest out-of-state reporters by distinct Form-R chemicals (deduped against the release-pound neighborhood).
Other Wec Energy Group Facilities
Same-parent TRI sites ranked by reported releases - including Oak Creek Site, Whitewater Generating Station, Presque Isle Power Plant.
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 compounds (except for barium sulfate (CAS No. 7727-43-7)), Manganese compounds, Vanadium compounds, Zinc compounds; nearby reporters include Kerry Inc. Rothschild. Weston Power Plant stamps HEAVY 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 Weston Power Plant TRI extract (HEAVY · OFFSITE · TRACE-CARC · lead Barium compounds (except for barium sulfate (CAS No. 7727-43-7))) joins EPA Form-R filings with facility identity - reported pounds, not a health-risk rating.
Weston Power Plant totals are self-reported EPCRA §313 estimates for Mosinee, WI, latest year 2023. Form-R rows span 2019–2023 (5 years). NAICS 221112 · Electric Utilities. 24.2% of Marathon TRI pounds in this extract. Nearest ABS peer: Duke Energy Progress LLC - Roxboro Steam Electric Plant (Δ 6.3K lbs). Pounds ≠ exposure.
Weston Power Plant stamps HEAVY volume · OFFSITE pathway · TRACE-CARC · lead Barium compounds (except for barium sulfate (CAS No. 7727-43-7)). 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