Largest greenhouse-gas emitters in Maine

29 facilities in Maine reported 3,421,060 metric tons CO2e of direct emissions to the EPA for 2023, 0.1% of the national total for reporting direct emitters. Power Plants accounts for the most (45%). Largest first.

#	Facility	City	Sector	t CO2e
1	Westbrook Energy Center	Westbrook	Power Plants	871,059
2	ND Paper Inc - Rumford Division	Rumford	Pulp and Paper	416,874
3	Maine Independence Station	Veazie	Power Plants	380,421
4	Sappi North America, Inc. - Somerset Operations	Skowhegan	Pulp and Paper, Waste	316,254
5	WOODLAND PULP LLC	Baileyville	Pulp and Paper, Waste	258,839
6	DRAGON CEMENT	Thomaston	Minerals	236,953
7	Rumford Power LLC	Rumford	Power Plants	160,818
8	PORTSMOUTH NAVAL SHIPYARD	Kittery	Other	72,231
9	Texas Instruments Incorporated - Maine Fab	South Portland	Other	69,822
10	JUNIPER RIDGE LANDFILL	Old Town	Waste	69,031
11	REGIONAL WASTE SYSTEMS INCORPORATED	Portland	Waste	62,778
12	JGT2 Cogen	Jay	Power Plants	56,679
13	William F Wyman	Yarmouth	Power Plants	52,726
14	Bucksport Mill, LLC	Bucksport	Waste, Power Plants	50,527
15	Westbrook	Westbrook	Petroleum and Natural Gas Systems	43,382
16	JGT2 Mill	Jay	Waste, Pulp and Paper	43,345
17	CROSSROADS LANDFILL	Norridgewock	Waste	34,848
18	University of Maine	Orono	Other	27,605
19	Richmond Station	Richmond	Petroleum and Natural Gas Systems	25,875
20	Northern Light - Eastern Maine Medical Center	Bangor	Other	24,023
21	Huhtamaki, Inc.	Waterville	Pulp and Paper	22,467
22	Pioneer Plastics Corporation	Auburn	Other	22,346
23	MCCAIN FOODS POTATO FACILITY	Easton	Other, Waste	21,371
24	Diodes US Manufacturing Incorporated	South Portland	Other	20,237
25	ND OTM LLC	Old Town	Pulp and Paper	17,886
26	S D WARREN CO	Westbrook	Pulp and Paper	13,352
27	International N&H USA, INC	Rockland	Other	12,585
28	BUCKSPORT GENERATION LLC	Bucksport	Power Plants	9,334
29	PENOBSCOT ENERGY RECOVERY CO.	Orrington	Waste	7,393

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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