Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
BLACK HILLS CORP - OSAG E POWER PLANT
3363 HWY 16, OSAGE, WY, 82723
Parent company: BLACK HILLS CORP
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 | Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | Hydrogen fluoride | Chlorine | Lead compounds | Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | Total (lbs) |
| 2010 | 46,935 | — | — | 1,038 | — | 47,989 |
| 2009 | 81,187 | — | — | 1,794 | — | 83,008 |
| 2008 | 77,305 | — | 10 | 1,708 | — | 79,052 |
| 2007 | 78,725 | — | 14 | 1,740 | — | 80,509 |
| 2006 | 83,581 | — | 14 | 1,848 | — | 85,472 |
| 2005 | 79,646 | — | 14 | 1,761 | — | 81,452 |
| 2004 | 77,701 | — | 12 | 1,718 | — | 79,461 |
| 2003 | 81,061 | — | 14 | 1,791 | — | 82,891 |
| 2002 | 80,166 | — | 13 | 1,772 | — | 81,975 |
| 2001 | 83,963 | — | 12 | 2,075 | — | 86,075 |
| 2000 | 83,291 | — | 11 | — | — | 83,327 |
| 1999 | 73,603 | 26,871 | 13,652 | — | 5,123 | 119,249 |
| 1998 | 131,525 | 33,110 | 13,787 | — | 10,200 | 188,622 |
▎ 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.