Largest greenhouse-gas emitters in Hawaii

26 facilities in Hawaii reported 6,706,243 metric tons CO2e of direct emissions to the EPA for 2023, 0.3% of the national total for reporting direct emitters. Power Plants accounts for the most (83%). Largest first.

#	Facility	City	Sector	t CO2e
1	HAWAIIAN ELECTRIC COMPANY (HECO) KAHE GENERATING STATION	Kapolei	Power Plants	2,081,849
2	HAWAIIAN ELECTRIC COMPANY (HECO) - WAIAU GENERATING STATION	Pearl City	Power Plants	1,105,796
3	KALAELOA COGENERATION PLANT	Kapolei	Power Plants	917,222
4	REFINERY KAPOLEI	Kapolei	Refineries, Chemicals	620,476
5	MAUI ELECTRIC CO (MECO) - MAALAEA GENERATING STATION	Kihei	Power Plants	464,012
6	COVANTA HONOLULU RESOURCE RECOVERY VENTURE (H-POWER)	Kapolei	Waste	233,988
7	HAWAII ELECTRIC LIGHT CO (HELCO) - KEAHOLE GENERATING STATION	Kailua Kona	Power Plants	178,753
8	HAWAIIAN ELECTRIC COMPANY (HECO) CAMPBELL INDUSTRIAL PARK GENERATING STATION	Kapolei	Power Plants	166,345
9	MAUI ELECTRIC CO (MECO) - KAHULUI GENERATING STATION	Kahului	Power Plants	159,452
10	HAWAII ELECTRIC LIGHT CO (HELCO) - KANOELEHUA HILL GENERATING STATION	Hilo	Power Plants	145,662
11	Hamakua Energy, LLC	Honokaa	Power Plants	116,846
12	KAUAI ISLAND UTILITY COOPERATIVE - KAPAIA POWER STATION	Lihue	Power Plants	111,261
13	South Hilo Sanitary Landfill	Hilo	Waste	74,318
14	CITY & COUNTY OF HONOLULU - WAIMANALO GULCH MSWLF	Kapolei	Waste	52,272
15	HAWAII ELECTRIC LIGHT CO (HELCO) - PUNA GENERATING STATION	Keaau	Power Plants	49,709
16	CENTRAL MAUI LANDFILL REFUSE & RECYCLING CENTER	Puunene	Waste	45,319
17	Hawaiian Commercial and Sugar Company	Puunene	Waste	42,510
18	KAUAI ISLAND UTILITY COOPERATIVE, PORT ALLEN GENERATING STATION	Eleele	Power Plants	34,141
19	SNG Plant	Kapolei	Petroleum and Natural Gas Systems	26,626
20	Palailai Landfill	Kapolei	Waste	24,080
21	MAUI ELECTRIC CO (MECO) - PALAAU GENERATING STATION	Kaunakakai	Power Plants	23,384
22	Kekaha Landfill	Kekaha	Waste	20,432
23	WEST HAWAII LANDFILL / PUU ANAHULU	Waikoloa	Waste	10,314
24	Kapaa and Kalaheo Sanitary Landfills	Kailua	Waste	1,472
25	Asphalt Hawaii Kalaeloa Asphalt Terminal	Kapolei	Petroleum and Natural Gas Systems	2
26	Par West Refinery	Kapolei	Refineries, Chemicals	0

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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