Facility detail

BLACK HILLS CORP - NEIL SIMPSON COMPLEX

13151 HWY 51, GILLETTE, WY, 82718

Parent company: BLACK HILLS CORP

Carcinogen PBT — EPA classifications across all reporting years

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Year-over-year total releases

Reported on-site TRI releases in pounds (lbs), grouped by reporting year.

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))	Barium And Barium Compounds	Manganese	Vanadium (except when contained in an alloy)	Copper	Total (lbs)
2024	—	1,320,341	78,286	72,144	63,702	1,691,646
2023	—	1,109,451	92,902	72,671	79,490	1,525,145
2022	—	1,454,828	98,358	71,608	76,863	1,896,918
2021	—	1,178,228	91,265	71,351	70,708	1,560,497
2020	1,414,911	—	102,445	77,881	75,988	1,831,216
2019	1,461,385	—	97,922	77,236	69,643	1,875,736
2018	—	1,789,000	101,912	86,204	82,488	2,250,966
2017	1,750,092	—	119,974	84,950	93,458	2,250,535
2016	1,517,105	—	132,370	80,416	81,479	1,993,139
2015	1,761,607	—	133,871	84,907	90,645	2,262,622
2014	1,759,998	—	155,630	85,079	83,197	2,306,922
2013	941,124	—	67,210	80,501	64,857	1,343,896
2012	1,755,222	—	97,465	85,993	90,802	2,241,318
2011	1,600,292	—	94,999	111,071	86,018	2,095,843
2010	1,811,152	—	108,522	148,882	108,148	2,411,120
2009	1,651,343	—	101,446	118,592	91,138	2,164,654
2008	1,500,153	—	105,124	116,897	91,546	2,009,957
2007	1,285,515	—	88,078	100,258	77,199	1,698,612
2006	1,108,480	—	71,317	84,573	66,573	1,456,008
2005	1,196,170	—	90,064	92,685	57,255	1,583,768
2004	1,076,315	—	81,628	68,173	71,411	1,599,265
2003	1,056,612	—	79,604	66,572	70,220	1,527,456
2002	940,370	—	73,497	56,749	62,445	1,307,576
2001	924,852	—	71,276	52,092	61,004	1,270,900
2000	866,758	—	66,011	47,775	57,189	1,191,946
1999	655,525	—	53,745	—	39,460	906,995
1998	1,303,027	—	78,158	—	71,153	1,699,139

▎ 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.