Maine CO₂ Emissions
Maine emitted 16 million metric tons of energy-related CO₂ in 2024, 0.3% of the US total. That ranks it 45th among the 50 states and the District of Columbia, at 11.4 metric tons per person.
Data year 2024 · Source: U.S. Energy Information Administration, State Energy Data System (June 2026)
How much CO₂ does Maine emit?
Maine produced 16 million metric tons of carbon dioxide from burning fossil fuels in 2024. The United States as a whole emitted 4.78 billion metric tons, so Maine accounts for 0.3% of the national total.
Per person, that is 11.4 metric tons, 19% below the US average of 14.1 metric tons. On that measure Maine ranks 33rd highest of 51.
CO₂ emissions in Maine since 1990
Energy-related emissions in Maine have fallen by 15% since 1990, from 19 million metric tons to 16 million metric tons. Compared with 2005, the baseline year for many US climate targets and marked on the chart, they have fallen by 31%. Emissions peaked in 2004 at 24 million metric tons and are now 34% below that level.
Emissions by sector
Transportation is the largest source of energy-related CO₂ in Maine, at about 47% of the total, followed by residential at 17% and electric power at 16%.
Emissions by fuel
Petroleum produces about 72% of the state’s energy-related CO₂, natural gas 27% and coal 1%.
How Maine compares with other states
These are the states closest to Maine in the 2024 ranking by total emissions. See the full ranking of all states.
| # | State | Total (Mt) | Share of US | Per person (t) |
|---|---|---|---|---|
| 43 | Idaho | 21.11 | 0.4% | 10.5 |
| 44 | Hawaii | 17.95 | 0.4% | 12.5 |
| 45 | Maine | 15.99 | 0.3% | 11.4 |
| 46 | South Dakota | 15.11 | 0.3% | 16.3 |
| 47 | New Hampshire | 13.60 | 0.3% | 9.7 |
Frequently asked questions
How much CO₂ does Maine emit per year?
Maine emitted 16 million metric tons of energy-related CO₂ in 2024, which is 0.3% of the US total of 4.78 billion metric tons.
What are the CO₂ emissions per person in Maine?
About 11.4 metric tons per person in 2024, 19% below the US average of 14.1 metric tons. That ranks 33rd highest of 51.
Have emissions in Maine fallen since 2005?
They have fallen by 31% since 2005 and fallen by 15% since 1990. Emissions peaked in 2004 at 24 million metric tons and are now 34% below that level.
What is the biggest source of CO₂ in Maine?
Transportation is the largest sector, at about 47% of energy-related emissions, followed by residential at 17%. By fuel, petroleum accounts for 72%.
About the data. Figures are energy-related carbon dioxide emissions: CO₂ from burning coal, natural gas and petroleum, in million metric tons. Emissions from power plants are counted in the state where the electricity is generated, not where it is used. Other greenhouse gases and non-energy sources such as agriculture are not included.
Source: U.S. Energy Information Administration, State Energy Data System, released June 26, 2026. Latest year available: 2024.
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