Largest greenhouse-gas emitters in Iowa

152 facilities in Iowa reported 43,592,034 metric tons CO2e of direct emissions to the EPA for 2023, 1.8% of the national total for reporting direct emitters. Power Plants accounts for the most (47%). Largest first.

#	Facility	City	Sector	t CO2e
1	Walter Scott Jr. Energy Center	Council Bluffs	Power Plants	5,752,624
2	Louisa	Muscatine	Power Plants	3,691,041
3	Ottumwa	Ottumwa	Power Plants	3,426,759
4	CF Industries Nitrogen, LLC-Port Neal Nitrogen Complex	Sergeant Bluff	Chemicals	3,191,237
5	ADM CORN PROCESSING	Cedar Rapids	Other, Waste	2,746,519
6	ADM CORN PROCESSING	Clinton	Other, Waste	1,945,777
7	Sutherland	Marshalltown	Power Plants	1,522,582
8	Iowa Fertilizer Company	Wever	Chemicals	1,350,065
9	George Neal North	Sergeant Bluff	Power Plants	1,322,337
10	Emery Station	Clear Lake	Power Plants	1,201,117
11	Koch Fertilizer Ft. Dodge, LLC	Duncombe	Chemicals	1,025,233
12	George Neal South	Salix	Power Plants	963,695
13	Davenport Plant	Buffalo	Minerals	841,277
14	Greater Des Moines Energy Center	Pleasant Hill	Power Plants	839,556
15	Muscatine	Muscatine	Power Plants, Other	679,632
16	Prairie Creek	Cedar Rapids	Power Plants	594,742
17	EQUISTAR CHEMICALS LP	Clinton	Chemicals	502,998
18	GRAIN PROCESSING CORP	Muscatine	Other, Waste	464,185
19	LEHIGH CEMENT CO LLC	Mason City	Minerals	446,400
20	CARGILL INC - EDDYVILLE	Eddyville	Other	399,264
21	ROQUETTE AMERICA INC	Keokuk	Other	351,512
22	SSAB Iowa Inc.	Muscatine	Metals	295,476
23	Arconic US LLC	Bettendorf	Metals	269,183
24	Ames	Ames	Power Plants	236,925
25	Cargill, Incorporated	Fort Dodge	Other	233,855
26	HOMELAND ENERGY SOLUTIONS LLC	Lawler	Other	229,718
27	Valero Renewable Fuels LLC Charles City	Charles City	Other	201,940
28	Poet Biorefining Fairbank LLC	Fairbank	Other	196,145
29	Valero Fort Dodge Plant	Fort Dodge	Other	195,687
30	LITTLE SIOUX CORN PROCESSORS, LLC	Marcus	Other	193,904
31	Valero Hartley Plant	Hartley	Other	192,779
32	VALERO ALBERT CITY PLANT	Albert City	Other	189,653
33	Carmeuse Davenport	Davenport	Minerals	186,934
34	POET Biorefining- Menlo, LLC	Menlo	Other	180,626
35	Elite Octane	Atlantic	Other	177,746
36	POET Biorefining Shell Rock, LLC.	Shell Rock	Other	174,101
37	BIG RIVER UNITED ENERGY LLC	Dyersville	Other	174,051
38	BLACK HAWK COUNTY SANITARY LANDFILL	Waterloo	Waste	173,456
39	GOLDEN GRAIN ENERGY, LLC	Mason City	Other, Waste	169,762
40	BIG RIVER RESOURCES WEST BURLINGTON LLC	West Burlington	Other	164,883
41	LOUIS DREYFUS COMMODITIES GRAND JUNCTION LLC	Grand Junction	Other	163,739
42	POET Biorefining- Arthur, LLC	Arthur	Other	159,570
43	ABSOLUTE ENERGY LLC	St Ansgar (mona)	Other	151,261
44	UNIV OF IOWA MAIN PWR PLANT	Iowa City	Other	148,016
45	IOWA STATE UNIVERSITY/ ISU HEATING PLANT	Ames	Other	146,726
46	SOUTHWEST IOWA RENEWABLE ENERGY	Council Bluffs	Other	145,413
47	POET Biorefining- Iowa Falls, LLC	Iowa Falls	Other	142,205
48	Exira Station	Brayton	Power Plants	131,628
49	PINE LAKE CORN PROCESSORS	Steamboat Rock	Other	124,046
50	Bunge	Council Bluffs	Other	112,309
51	POET BIOREFINING	Jewell	Other	111,870
52	Valero Lakota Plant	Lakota	Other	111,809
53	PINNACLE ETHANOL LLC d/b/a POET BIOREFINING - CORNING	Corning	Other	110,033
54	ADM SOYBEAN PROCESSING - DES MOINES	Des Moines	Other	108,458
55	POET BIOREFINING - GOWRIE, LLC	Gowrie	Other	107,851
56	AHN Heartland Ingredients	Eddyville	Other	104,073
57	POET Biorefining - Hanlontown LLC	Hanlontown	Other	102,352
58	LINCOLNWAY ENERGY LLC	Nevada	Other	101,232
59	GREEN PLAINS SHENANDOAH LLC	Shenandoah	Other	101,170
60	GUARDIAN INDUSTRIES - DeWitt	Dewitt	Minerals	98,146
61	Poet Biorefining Ashton	Ashton	Other	94,566
62	CARGILL INC-CEDAR RAPIDS	Cedar Rapids	Other	92,119
63	SIOUXLAND ENERGY COOPERATIVE	Sioux Center	Other	87,511
64	CORN LP	Goldfield	Other	87,144
65	VOYAGER ETHANOL LLC	Emmetsburg	Other	85,822
66	ALLIANCE PIPELINE L.P. - MANCHESTER	Manchester	Petroleum and Natural Gas Systems	82,855
67	Loess Hills Regional Sanitary Landfill	Malvern	Waste	82,200
68	Cedar Rapids/Linn County Solid Waste Agency Site #2	Marion	Waste	80,661
69	Poet Biorefining-Coon Rapids	Coon Rapids	Other	79,543
70	LANDFILL OF NORTH IOWA	Clear Lake	Waste	76,499
71	GREEN PLAINS SUPERIOR LLC	Superior	Other	75,855
72	US GYPSUM - SPERRY PLANT	Mediapolis	Minerals	74,570
73	Bayer CropScience LP	Muscatine	Chemicals	73,944
74	TYSON FRESH MEATS INC	Columbus Junction	Waste, Other	73,268
75	THE ANDERSONS MARATHON HOLDINGS LLC	Denison	Other	72,860
76	QUAD CNTY CORN PROCESSORS	Galva	Other	70,827
77	AG PROCESSING INC-EAGLE GROVE	Eagle Grove	Other	70,515
78	GREEN VALLEY CHEMICAL CORP	Creston	Chemicals	65,745
79	Ag Processing Inc	Sergeant Bluff	Other	65,183
80	NORTHERN NATURAL GAS CO-OGDEN COMPRESSOR	Ogden	Petroleum and Natural Gas Systems	64,527
81	DES MOINES COUNTY REGIONAL SOLID WASTE COMMISSION	West Burlington	Waste	61,585
82	METRO METHANE RECOVERY FACILITY	Mitchellville	Waste	61,540
83	Northwest Ia. Area Solid Waste Agency	Sheldon	Waste	61,034
84	Cargill Incorporated	Iowa Falls	Other	60,937
85	Cargill Incorporated	Sioux City	Other	60,583
86	UNIVERSITY OF NORTHERN IOWA - POWER PLANT/MAIN CAMPUS	Cedar Falls	Other	59,125
87	INGREDION INCORPORATED	Cedar Rapids	Other	56,565
88	GREAT RIVER REGIONAL WASTE AUTHORITY SANITARY LANDFILL	Fort Madison	Waste	54,367
89	SOUTH CENTRAL IOWA SOLID WASTE AGENCY SCISWA	Tracy	Waste	53,314
90	Cedar Rapids/Linn County Solid Waste Agency Site #1	Cedar Rapids	Waste	53,053
91	NCIRSWA Sanitary Landfill	Fort Dodge	Waste	52,033
92	Plymouth Energy LLC	Merrill	Other	51,991
93	JBS SWIFT	Marshalltown	Other, Waste	51,697
94	NGPL Station 107 Emerson, IA	Emerson	Petroleum and Natural Gas Systems	50,807
95	Boone County Sanitary Landfill	Boone	Waste	50,274
96	Novelis ALR Aluminum LLC (Davenport Casting)	Davenport	Metals	49,269
97	TYSON FRESH MEATS, INC. - WATERLOO	Waterloo	Other	48,704
98	SMITHFIELD FRESH MEATS CORP-DENISON	Denison	Other, Waste	48,539
99	Gold Bond - FTD Plant	Fort Dodge	Minerals	46,496
100	TYSON FRESH MEATS INC-PERRY	Perry	Other, Waste	46,152
101	GNRL MILLS	Cedar Rapids	Other	45,114
102	JOHN DEERE FNDRY WATERLOO	Waterloo	Other	45,076
103	CARROLL COUNTY SOLID WASTE MANAGEMENT COMMISSION	Carroll	Waste	44,800
104	CENTRAL DISPOSAL SYSTEMS INC	Lake Mills	Waste	44,514
105	Georgia-Pacific Gypsum LLC - Fort Dodge	Fort Dodge	Minerals	44,224
106	NGPL Station 109 Harper, IA	Harper	Petroleum and Natural Gas Systems	43,096
107	JBS Swift Food	Ottumwa	Other, Waste	42,757
108	CITY OF MUSCATINE LANDFILL	Blue Grass	Waste	42,668
109	BRIDGESTONE AMERICAS TIRE OPERATIONS, LLC	Des Moines	Other	41,169
110	CLINTON COUNTY SANITARY LANDFILL (EAST)	Clinton	Waste	39,638
111	OTTUMWA / WAPELLO COUNTY SANITARY LANDFILL	Ottumwa	Waste	39,467
112	Mahaska County Sanitary Landfill - Binns and Stevens Site	Oskaloosa	Waste	38,422
113	US ARMY IOWA ARMY AMMUNITION PLANT-AMERICAN ORDNANCE LLC	Middletown	Other	37,272
114	GELITA USA	Sergeant Bluff	Other	37,117
115	Redfield UGS and Compressor Station	Redfield	Petroleum and Natural Gas Systems	36,491
116	Shell Rock Soy Processing	Shell Rock	Other	36,489
117	Summit Lake	Creston	Power Plants	36,040
118	WINNESHIEK COUNTY SANITARY LANDFILL	Decorah	Waste	35,734
119	Cargill Incorporated	Cedar Rapids	Other	35,611
120	GERDAU AMERISTEEL US INC	Wilton	Metals	31,887
121	Marshall County Sanitary Landfill	Marshalltown	Waste	31,812
122	Nestle Purina Petcare Co.	Davenport	Other	31,501
123	NGPL Station 204 Columbus Junction, IA	Columbus Junction	Petroleum and Natural Gas Systems	31,369
124	ANR Pipeline Birmingham CS	Birmingham	Petroleum and Natural Gas Systems	30,814
125	South Central Iowa Landfill	Winterset	Waste	30,252
126	USDA-NATIONAL ANIMAL DISEASE CENTER	Ames	Other	28,205
127	AG PROCESSING INC-SHELDON	Sheldon	Other	27,848
128	Tyson Fresh Meats	Storm Lake	Other	27,655
129	Potters Industries, Inc. - Muscatine, IA	Muscatine	Minerals	27,523
130	QUAKER MFG LLC	Cedar Rapids	Other	27,403
131	City of Newton Sanitary Landfill	Newton	Waste	26,974
132	IOWA CITY SANITARY LANDFILL	Iowa City	Waste	26,465
133	AG PROCESSING INC	Emmetsburg	Other	23,462
134	PB LEINER USA	Davenport	Chemicals	22,012
135	TITAN TIRE CORP	Des Moines	Other	18,635
136	Burlington (IA)	Burlington	Power Plants	18,575
137	DICKINSON LANDFILL INC	Spirit Lake	Waste	15,753
138	DUBUQUE METROPOLITAN SANITARY LANDFILL	Dubuque	Waste	15,419
139	Pleasant Hill Energy Center	Pleasant Hill	Power Plants	13,374
140	Oakland Compressor Station	Oakland	Petroleum and Natural Gas Systems	12,857
141	Waterloo Compressor Station	Waterloo	Petroleum and Natural Gas Systems	12,578
142	Sycamore Combustion Turbine	Johnston	Power Plants	11,320
143	Streeter Station	Cedar Falls	Power Plants	10,497
144	NGPL Station 108 Truro, IA	Truro	Petroleum and Natural Gas Systems	10,242
145	Northern Natural Gas - Ventura Compressor Station	Garner	Petroleum and Natural Gas Systems	9,164
146	Electrifarm	Waterloo	Power Plants	8,694
147	SCOTT AREA SANITARY LANDFILL	Davenport	Waste	8,185
148	ANR Pipeline Lineville CS	Lineville	Petroleum and Natural Gas Systems	7,995
149	Tama Paperboard, LLC	Tama	Pulp and Paper	7,353
150	Earl F Wisdom	Spencer	Power Plants	6,001
151	Dayton Avenue Substation	Ames	Power Plants	1,856
152	Lansing	Lansing	Power Plants	1,091

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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