Largest greenhouse-gas emitters in Maryland

53 facilities in Maryland reported 14,414,740 metric tons CO2e of direct emissions to the EPA for 2023, 0.6% of the national total for reporting direct emitters. Power Plants accounts for the most (66%). Largest first.

#	Facility	City	Sector	t CO2e
1	Heidelberg Materials US Cement LLC	Union Bridge	Minerals	1,857,878
2	Keys Energy Center	Brandywine	Power Plants	1,655,377
3	Wildcat Point Generation Facility	Conowingo	Power Plants	1,652,500
4	St Charles Energy Center	Waldorf	Power Plants	1,604,880
5	Brandon Shores LLC	Baltimore	Power Plants	1,236,592
6	COVE POINT LNG FACILITY	Lusby	Power Plants, Petroleum and Natural Gas Systems	1,152,356
7	AES Warrior Run	Cumberland	Power Plants	781,434
8	Chalk Point	Aquasco	Power Plants	471,263
9	Holcim (US), Inc.	Hagerstown	Minerals	451,527
10	Brandywine Power Facility	Brandywine	Power Plants	298,669
11	WHEELABRATOR BALTIMORE LP	Baltimore	Waste	282,461
12	MONTGOMERY COUNTY RESOURCE RECOVERY FACILITY	Dickerson	Waste	219,463
13	Dickerson	Dickerson	Power Plants	198,238
14	US PUBLIC HEALTH SERVICE NATIONAL INSTITUTES OF HEALTH	Bethesda	Other	189,740
15	Perryman	Perryman	Power Plants	152,743
16	CENTRAL SANITARY LANDFILL	Newark	Waste	121,695
17	Rock Springs Generating Facility	Rising Sun	Power Plants	119,725
18	Eastern Sanitary Landfill Solid Waste Management Facility	White Marsh	Waste	113,993
19	MIDSHORE II REGIONAL SOLID WASTE FACILITY	Ridgely	Waste	112,909
20	GRACE	Baltimore	Chemicals	109,752
21	American Sugar Refining, Inc. - Baltimore Refinery	Baltimore	Other	108,612
22	TRANSCO STATION 190	Ellicott City	Petroleum and Natural Gas Systems	97,685
23	University of Maryland	College Park	Other	97,315
24	Gold Bond - BAL Plant	Baltimore	Minerals	90,863
25	Cecil County Central Landfill	Elkton	Waste	90,754
26	H A Wagner LLC	Baltimore	Power Plants	80,047
27	ROUTE 40 WEST LANDFILL	Hagerstown	Waste	74,764
28	The Johns Hopkins Hospital	Baltimore	Other	71,689
29	CHARLES COUNTY LANDFILL	Waldorf	Waste	69,335
30	Federal Research Center at White OAK Central Utility Plant	Silver Spring	Power Plants	69,073
31	MILLERSVILLE LANDFILL	Severn	Waste	62,029
32	National Institute of Standards and Technology	Gaithersburg	Other	61,268
33	SPRING GARDENS STEAM PLANT	Baltimore	Power Plants	55,078
34	NEWLAND PARK LANDFILL	Salisbury	Waste	49,506
35	REICHS FORD MUNICIPAL LANDFILL & RECYCLING CENTER	Frederick	Waste	49,420
36	Darling Ingredients, Inc. - Linkwood	Linkwood	Other, Waste	46,849
37	PERDUE AGRIBUSINESS LLC	Salisbury	Other	45,021
38	GARRETT COUNTY SOLID WASTE DISPOSAL & RECYCLING FACILITY	Oakland	Waste	44,857
39	HARFORD WASTE DISPOSAL CENTER	Street	Waste	44,442
40	US NAVY NAVAL SUPPORT FACILITY INDIAN HEAD	Indian Head	Other	44,129
41	PRINCE GEORGES COUNTY BROWN STATION ROA	Upper Marlboro	Waste	41,826
42	Naval Support Activity Bethesda	Bethesda	Other	38,782
43	MIDSHORE I REGIONAL SOLID WASTE FACILITY	Easton	Waste	32,983
44	Eastern Gas Transmission and Storage - Myersville Station (Tran)	Middletown	Petroleum and Natural Gas Systems	32,404
45	ALPHA RIDGE LANDFILL	Marriottsville	Waste	25,772
46	Accident Station	Accident	Petroleum and Natural Gas Systems	24,516
47	JOHNS HOPKINS - HOMEWOOD CAMPUS	Baltimore	Other	21,789
48	QUARANTINE ROAD LANDFILL	Curtis Bay	Waste	20,112
49	METTIKI COAL, LLC	Oakland	Other	19,744
50	Glen Burnie Landfill	Glen Burnie	Waste	10,838
51	MOUNTAINVIEW SANITARY LANDFILL	Frostburg	Waste	4,786
52	ABERDEEN PROVING GROUND-Aberdeen Area & Edgewood Area	Apg	Other	4,784
53	Morgantown	Newburg	Power Plants	471

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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