Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
HARDIN GENERATING STATION
643 INDUSTRIAL PARK RD, HARDIN, MT, 59034
Parent company: ROCKY MOUNTAIN POWER LLC
Carcinogen
PBT
— EPA classifications across all reporting years
Top chemical totals
The 10 chemicals with the highest cumulative on-site releases in pounds (lbs) across all available years.
Full release table
Rows are years. Columns show the five highest-total chemicals across all years plus each year's total release volume.
| All values in pounds (lbs) | ||||||
|---|---|---|---|---|---|---|
| Year | 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)) | Manganese compounds | Barium And Barium Compounds | Manganese | Total (lbs) |
| 2024 | 26,940 | — | — | 2,863 | 1,401 | 32,245 |
| 2023 | 24,298 | — | — | 3,016 | 1,386 | 29,648 |
| 2022 | 29,851 | — | — | 4,932 | 2,195 | 38,230 |
| 2021 | 27,020 | — | — | 5,752 | 2,513 | 36,517 |
| 2020 | — | — | — | 502 | — | 588 |
| 2019 | 7,631 | 783 | 431 | — | — | 9,178 |
| 2018 | 8,072 | — | — | 1,074 | — | 10,048 |
| 2017 | 6,100 | 1,987 | 1,154 | — | — | 9,723 |
| 2016 | 17,857 | 2,304 | 1,417 | — | — | 22,445 |
| 2015 | 26,342 | 3,462 | 2,134 | — | — | 33,226 |
| 2014 | 35,801 | 4,687 | 2,832 | — | — | 45,043 |
| 2013 | 33,212 | 4,863 | 2,646 | — | — | 42,274 |
| 2012 | 20,554 | 2,955 | 1,749 | — | — | 26,276 |
| 2011 | 33,595 | 4,049 | 2,534 | — | — | 41,778 |
| 2010 | 41,043 | 5,500 | 3,250 | — | — | 51,758 |
| 2009 | 41,170 | 5,973 | 3,467 | — | — | 52,681 |
| 2008 | 31,302 | 5,489 | 3,160 | — | — | 41,646 |
| 2007 | 39,099 | 7,541 | 4,271 | — | — | 53,099 |
| 2006 | 27,205 | 4,089 | 2,107 | — | — | 34,695 |
▎ Facilities report to EPA's TRI once they manufacture, process, or use a listed chemical above set thresholds. Once that threshold is crossed, they must report actual releases regardless of size — so a small number reflects genuine low-level discharge, not a data error.