EPA TRI Facility · Electric Utilities
National Grid Port Jefferson Power Station
Port Jefferson, NY · Parent: National Grid USA
- Total releases
- 126.5K lbs
- Chemicals reported
- 5
- Carcinogens
- 3
- Primary pathway
- Air Releases
National Grid Port Jefferson Power Station is an EPA Toxics Release Inventory reporter in Port Jefferson, NY, in the electric utilities sector. It reported 21.5K lbs of releases across 3 chemicals in 2024, and 126.5K lbs in total across its 2019-2024 reporting years. That ranks 4,083 of 25,986 TRI facilities nationwide by cumulative reported pounds, counting each facility over however many years it has filed. Reported volume fell against 2022. Pounds reported are not a measure of toxicity or health risk.
National Grid Port Jefferson Power Station has reported 126.5K lbs of toxic releases across 5 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 60% of the facility's chemical profile. The facility operates in the Electric Utilities sector. The primary release pathway is air releases, accounting for 100% 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.
Where this facility sits in the TRI record
Among the 513 Electric Utilities facilities in this database, National Grid Port Jefferson Power Station reports the 309th-largest volume (126.5K lbs). Its reported volume is concentrated rather than spread: Ammonia alone is 99.8% of the total.
Placement is computed from reported TRI pounds in this database. Thresholds are fixed across every facility page: concentrated ≥60% of volume in one chemical, county-dominant ≥25% of the county total, carcinogen-heavy ≥50% of pounds. Share-based statements are shown only for sites reporting at least 1,000 lbs, because a share of a very small total is not a meaningful signal. Reported pounds are self-reported estimates and do not measure toxicity or health risk.
National Grid Port Jefferson Power Station files annual Form R disclosures to the EPA Toxics Release Inventory under EPCRA Section 313, classified under NAICS 221112 (Electric Utilities). Across 6 years of records spanning 2019–2024, the site has disclosed 126.5K lbs in cumulative toxic releases across 5 distinct chemicals, 3 of which (60%) carry a carcinogenic classification.
The dominant release pathway is air releases at 147.7K lbs (99.8% of total volume), followed by off-site transfers at 0.2%. Between 2019 and 2024, reported totals increased by 36% - from 15.8K lbs to 21.5K lbs. The facility is operated under parent company National Grid USA.
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 National Grid Port Jefferson Power Station has filed with the EPA under federal community right-to-know requirements.
Annual disclosure change
What changed: EPA TRI 2023 reporting year
- National Grid Port Jefferson Power Station's total reported releases fell from 28.9 thousand lb in 2022 to 22.4 thousand lb in 2023, based on EPA TRI filings.
- National Grid Port Jefferson Power Station's off-site transfers rose from 0 lb in 2022 to 322 lb in 2023, based on EPA TRI filings.
- National Grid Port Jefferson Power Station's air releases fell from 28.9 thousand lb in 2022 to 22.1 thousand lb in 2023, based on EPA TRI filings.
Quick Facts
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See how National Grid Port Jefferson Power Station stacks up against nearby facilities and the typical reporter.
58.7× more than the comparison
5.0× 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 National Grid Port Jefferson Power Station releases toxic chemicals into the environment. Total: 148.0K lbs.
Emissions Trend Summary
From 2019 to 2024, total releases increased by 36% (15.8K lbs to 21.5K lbs).
Reported total releases by year
National Grid Port Jefferson Power Station - annual TRI totals
- 2019 0
2019
0 million lbs
- 2020 0
2020
0 million lbs
- 2021 0
2021
0 million lbs
- 2022 0
2022
0 million lbs
- 2023 0
2023
0 million lbs
- 2024 0
2024
0 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 | 15.8K lbs | 3 |
| 2020 | 28.2K lbs | 3 |
| 2021 | 31.2K lbs | 3 |
| 2022 | 28.9K lbs | 4 |
| 2023 | 22.4K lbs | 4 |
| 2024 | 21.5K lbs | 3 |
Chemical Releases
Aggregated across all reporting years (2019–2024). 3 of 5 chemicals are carcinogens. Sorted by total release volume.
| Chemical | Total | Flags |
|---|---|---|
| Ammonia | 147.7K lbs | - |
| Lead | 323 lbs | Carcinogen |
| Polycyclic aromatic compounds | 20 lbs | Carcinogen |
| Naphthalene | 4 lbs | Carcinogen |
| Benzo[g,h,i]perylene | 0 lbs | - |
Location
Nearest TRI Facilities to National Grid Port Jefferson Power Station
The closest other reporting facilities in New York, ordered by distance.
Similar Electric Utilities Facilities
Other Electric Utilities facilities with similar total release volumes (±80%), outside New York.
Other National Grid USA Facilities
TRI facilities operated by the same parent company, ranked by total reported releases.
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
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Explore More Data for New York
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 National Grid Port Jefferson Power Station are rising or falling over time. View trends
- This facility ranks #4,083 of 25,986 TRI facilities nationwide by total reported releases. Ranking reflects reported pounds, not toxicity or health risk. See the full rankings
- Check New York's statewide profile for the full picture: total facilities, water systems, and Superfund sites. View New York 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 National Grid Port Jefferson Power Station. 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. 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.