Largest greenhouse-gas emitters in Montana

28 facilities in Montana reported 18,007,481 metric tons CO2e of direct emissions to the EPA for 2023, 0.8% of the national total for reporting direct emitters. Power Plants accounts for the most (75%). Largest first.

#	Facility	City	Sector	t CO2e
1	Colstrip	Colstrip	Power Plants	10,967,111
2	PHILLIPS 66 BILLINGS REFINERY	Billings	Refineries, Chemicals	967,045
3	CHS INC LAUREL REFINERY	Laurel	Refineries, Chemicals	918,021
4	YELLOWSTONE ENERGY LIMITED PARTNERSHIP	Billings	Power Plants	830,005
5	Par Montana, LLC Billings Refinery	Billings	Refineries, Chemicals	719,769
6	Hardin Generating Station	Hardin	Power Plants	663,072
7	COLSTRIP ENERGY LTD PARTNERSHIP	Colstrip	Power Plants	474,565
8	Calumet Montana Refining, LLC	Great Falls	Chemicals, Refineries	427,371
9	Dave Gates Generating Station	Anaconda	Power Plants	330,090
10	ASH GROVE CEMENT COMPANY-MONTANA CITY	Clancy	Minerals	323,958
11	GRAYMONT WESTERN U.S. INC. INDIAN CREEK	Townsend	Minerals	276,271
12	Trident	Three Forks	Minerals	250,489
13	BILLINGS CITY LANDFILL	Billings	Waste	143,248
14	Culbertson Station	Culbertson	Power Plants	137,957
15	WESTERN SUGAR COOPERATIVE	Billings	Minerals	122,996
16	MONTANA WASTE SYSTEMS - HIGHPLAINS SANITARY LANDFILL	Floweree	Waste	85,786
17	Basin Creek Plant	Butte	Power Plants	55,610
18	GALLATIN COUNTY LOGAN LANDFILL	Manhattan	Waste	55,531
19	Weyerhaeuser NR- Columbia Falls	Columbia Falls	Other	40,706
20	REC SILICON	Silver Bow	Metals	35,245
21	Lewis & Clark County Landfill	Helena	Waste	34,916
22	Malteurop North America Inc	Great Falls	Other	29,063
23	Cabin Creek Compressor Station	Baker	Petroleum and Natural Gas Systems	28,933
24	Missoula Landfill	Missoula	Waste	27,790
25	Hiland Partners Bakken Gathering Plant	Sidney	Petroleum and Natural Gas Systems	26,275
26	Crusoe Energy Systems - Kraken CDP	Fairview	Other	22,915
27	Lewis & Clark	Richland	Power Plants	10,054
28	SIDNEY SUGARS INCORPORATED	Sidney	Other	2,690

Source: EPA Greenhouse Gas Reporting Program, 2023 reporting year, sector-level emissions from data.epa.gov (fetched October 31, 2026). Direct emissions in metric tons CO2e as EPA totals them: emitter sectors only, biogenic CO2 reported separately. Covers facilities that report as direct emitters; most emit 25,000 t CO2e or more a year. Reference only.

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